{"title":"Wall Membranes","description":"\u003cp\u003eLiquid-applied membranes for every wall in the building. Internally, \u003ca href=\"\/en-us\/products\/passive-purple-internal-airtight-vapour-control-paint-11-4kg\"\u003ePassive Purple\u003c\/a\u003e and Airtight White handle airtightness and vapor control; externally, \u003ca href=\"\/en-us\/products\/facade-waterproofing-membrane-5kg\"\u003ePassive Purple External\u003c\/a\u003e (fire rated Class B) weatherproofs façades. Poseidon tanks bathroom and wetroom walls, Waterproof Blue deals with damp, and FRED adds a Class A2-s1,d0 fire retardant thermal barrier over timber and spray foam. Whatever the wall needs — airtight, waterproof, fire rated or all three — it goes on by spray, roller or brush and cures to one continuous membrane.\u003c\/p\u003e","products":[{"product_id":"white-airtight-vapour-control-paint-6-9kg","title":"Airtight White Brush - Home Pack (6.9kg) - Vapour Control Paint - Brush Applied","description":"\u003cp\u003e\u003cstrong\u003ePassive Purple Airtight White Brush\u003c\/strong\u003e is a \u003cstrong\u003efibre-reinforced polymer emulsion\u003c\/strong\u003e applied by paintbrush to create a \u003cstrong\u003epermanent liquid airtight vapour control membrane\u003c\/strong\u003e. Its smooth white finish makes it perfect for \u003cstrong\u003eretrofits, detailing, and projects where the airtight layer is left exposed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive Purple formulation\u003c\/strong\u003e – the same formulation as BBA-approved, Passivhaus-certified Passive Purple\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM1 Class, VOC-Free\u003c\/strong\u003e – water-based, non-toxic, and safe for installers and the environment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire Class C Rated\u003c\/strong\u003e – safer than traditional membranes rated only Class E\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Adhesion\u003c\/strong\u003e – bonds to concrete, brick, timber, plasterboard, OSB, steel, and more\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoverage Efficiency\u003c\/strong\u003e – \u003cstrong\u003e1kg covers 1m²\u003c\/strong\u003e; one operative can apply up to \u003cstrong\u003e300m² per day\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhere to Use Airtight White Brush\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFloor, wall, and ceiling junctions\u003c\/li\u003e\n\u003cli\u003eWindow and door reveals\u003c\/li\u003e\n\u003cli\u003eService penetrations (pipes, ducts, cables)\u003c\/li\u003e\n\u003cli\u003eSmall retrofit airtightness projects\u003c\/li\u003e\n\u003cli\u003eAny area where a \u003cstrong\u003ewhite airtight coating is required on show\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6.9kg Passive Purple Airtight White Brush\u003c\/strong\u003e is the \u003cstrong\u003efast, proven solution\u003c\/strong\u003e for creating airtight, durable, and visually clean airtight layers in both new builds and retrofit projects.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTest data - worldwide\u003c\/h2\u003e\n\u003cp\u003eAirtight White Brush is the white-pigmented Passive Purple formulation. Passive Purple has been independently tested to \u003cstrong\u003eboth ASTM and EN standards\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrench A+ indoor-air rating \u0026amp; Finnish M1 class\u003c\/strong\u003e - very low VOC emissions (EN 16516 \/ RTS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive House Institute Class A airtight\u003c\/strong\u003e - 0.02 m³\/h·m² @ 50 Pa (EN 12114)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir barrier material\u003c\/strong\u003e - 0.02 L\/s·m² at 75 Pa (ASTM E2178)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire\u003c\/strong\u003e - Class A to ASTM E84; Euroclass C-s1,d0 to EN 13501-1 (B-s1,d0 with FRED)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight\u003c\/strong\u003e (EN 14891) \u0026amp; intelligent vapour control, Sd ~0.8–40 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong adhesion\u003c\/strong\u003e - steel 2.7, CLT 1.83, gypsum 1.6, brick 1.5 N\/mm² (EN ISO 4624)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10\/10 mould resistance\u003c\/strong\u003e (ASTM D3273) · 🛡️ radon \u0026amp; methane barrier · ♻️ EPD (EN 15804)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificates\u003c\/strong\u003e - Passivhaus certification and BBA approval are held by Passive Purple, not by Airtight White Brush\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Passive Purple Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-french-a-plus-emissions-rating\"\u003ethe French A+ rating explained\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/what-is-a-vapour-control-layer-vcl-explained\" title=\"What Is a Vapour Control Layer? | VCL Explained\"\u003eWhat Is a Vapour Control Layer? | VCL Explained\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/builder-forgot-the-vapour-control-layer-how-to-fix-it\" title=\"My Builder Forgot the Vapour Control Layer? Here’s How to Fix It\"\u003eMy Builder Forgot the Vapour Control Layer? Here’s How to Fix It\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/how-to-retrofit-vapour-control-without-the-mess-bba-approved-passivhaus-certified-building-control-ready\" title=\"How to Retrofit Vapour Control Without the Mess\"\u003eHow to Retrofit Vapour Control Without the Mess\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-04)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608800129364,"sku":"IM\/00ATWB6.9","price":59.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Airtight_White_Brush.png?v=1792499655"},{"product_id":"fred-flame-retardant-paint","title":"FRED - Fire Retardant Thermal Barrier Intumescent Coating (Class A2-S1, D0) Timber and Spray Foam","description":"\u003cp\u003e\u003cstrong\u003eFred\u003c\/strong\u003e by Intelligent Membranes is an advanced, high-performance fire retardant designed to safeguard spray foam insulation and timber structures from fire hazards. Formulated with cutting-edge fire-resistant technology, \u003cstrong\u003eFred\u003c\/strong\u003e provides unparalleled protection while maintaining the structural integrity of your building. Whether you’re working on new builds or retrofits, \u003cstrong\u003eFred\u003c\/strong\u003e delivers exceptional safety and peace of mind.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features and Benefits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Resistant Protection for Spray Foam\u003c\/strong\u003e: Fred is specifically designed to provide effective fire resistance when applied over spray foam insulation, a material often vulnerable to fire risks. It helps prevent the spread of fire, giving added security to energy-efficient construction projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal for Timber Structures\u003c\/strong\u003e: Fred is also an excellent solution for timber frame buildings, offering a protective barrier that significantly reduces the risk of fire damage. This ensures compliance with fire safety regulations while preserving the natural appeal of timber construction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple Application\u003c\/strong\u003e: Available as a liquid-applied product, Fred can be sprayed directly onto surfaces, ensuring seamless coverage and a uniform protective layer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-Toxic and Eco-Friendly\u003c\/strong\u003e: Formulated with low VOCs and environmentally-friendly components, making it safe for use in all types of buildings, including those aiming for Net Zero and Passivhaus standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTested and Certified\u003c\/strong\u003e: Fred meets the strictest fire safety standards, ensuring your project is compliant with the latest building regulations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFRED is certified Class A2-s1,d0.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFRED has been fire tested by Warringtonfire on 11mm OSB. We rate it at \u003cstrong\u003e15 minutes\u003c\/strong\u003e of fire protection on 11mm OSB, a deliberate safety margin below the tested result.\u003c\/p\u003e\n\u003cp\u003eFRED is used inside. In case of external application, it should be coated with a fire retarding flexible coating such as Passive Purple External or local building regulations need to be followed.\u003c\/p\u003e\n\u003cp\u003eFred has been tested as part of a system by UKTC on a non-load-bearing partition wall filled with 140mm closed-cell polyurethane foam, assembly when classified in accordance  \u003cstrong\u003eBS EN 13501-2:2023 as E20, EL20, EW20\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis testing means Fred, as part of the system, will have,\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eE20 - Integrity for 20 minutes\u003c\/strong\u003e - The barrier stops the physical passage of flames, smoke, and hot toxic gases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEW20 - Integrity \u0026amp; Radiation Control for 20 minutes\u003c\/strong\u003e - Like E20 it blocks flames and smoke. However, it adds a layer of safety by restricting radiant heat transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEL20 - Integrity \u0026amp; Full Insulation\u003c\/strong\u003e - This is the highest class of fire protection. It blocks flames and smoke, while completely insulating against heat transfer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIf Fred is to be spray applied, it must be applied with an intumescent spray machine. Intelligent Membranes would recommend a TriTech T5 spray machine or a machine with similar specifications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlso available in white and gray – please telephone Intelligent Membranes to discuss these other colors\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eSpray foam thermal barrier: the Class B build-up\u003c\/h2\u003e\n\u003cp\u003eExposed spray foam is combustible; on its own it typically classifies as Euroclass E, so building control and insurers normally require a fire-rated thermal barrier over it. FRED is Intelligent Membranes' intumescent thermal barrier for the job, tested in the UK and EU to EN 13501-1. Applied as a build-up of \u003cstrong\u003espray foam → Supergrip FR fire-rated primer → FRED\u003c\/strong\u003e, it brings exposed foam up to a \u003cstrong\u003eClass B reaction to fire\u003c\/strong\u003e, while FRED itself is certified Class A2-s1,d0. \u003ca href=\"\/en-us\/blogs\/educational\/spray-foam-fire-protection-thermal-barrier-fred\" title=\"Spray Foam Fire Protection: How Foam, Primer and FRED Achieve Class B\"\u003eRead the full spray-foam fire-protection guide →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/spray-foam-fire-protection-thermal-barrier-fred\" title=\"Spray Foam Fire Protection: How Foam, Primer and FRED Achieve Class B\"\u003eSpray Foam Fire Protection: How Foam, Primer and FRED Achieve Class B\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/intumescent-paint-explained\" title=\"Intumescent Paint Explained: How Fire Retardant Coatings Protect Timber and Spray Foam\"\u003eIntumescent Paint Explained: How Fire Retardant Coatings Protect Timber and Spray Foam\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/fire-protection-for-timber-frame-and-spray-foam\" title=\"Fire Protection for Timber Frame and Spray Foam\"\u003eFire Protection for Timber Frame and Spray Foam\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/understanding-our-certifications-and-what-they-mean-for-you\" title=\"Understanding Our Certifications and What They Mean for You\"\u003eUnderstanding Our Certifications and What They Mean for You\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-12)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Orange","offer_id":52608800751956,"sku":"IM\/00FRED10ORANGE","price":150.0,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":52608800784724,"sku":"IM\/00FRED10WHITE","price":150.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/FRED.png?v=1792502546"},{"product_id":"passive-purple-internal-airtight-vapour-control-paint-11-4kg","title":"Passive Purple - Vapor Control, Airtight \u0026 Smoke Tight Paint (11.4kg) - Spray \/ Roller Applied","description":"\u003cp\u003e\u003cpicture\u003e\u003csource media=\"(max-width:749px)\" srcset=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/new_passive_purple_product_hero_mobile_2.png?v=1784621723\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/new_passive_purple_product_hero_desktop_1.png?v=1784621723\" alt=\"Passive Purple liquid-applied airtight, vapor control and smoke tight membrane — Passivhaus certified, BBA approved and tested to ASTM and EN standards\" loading=\"eager\" style=\"width: 100%; height: auto; display: block; border-radius: 10px; margin: 0 0 24px;\"\u003e\u003c\/picture\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat is Passive Purple and How Does it Work?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple\u003c\/strong\u003e is the world’s first \u003cstrong\u003ePassivhaus-certified liquid vapor control, airtight, and smoke-tight paint\u003c\/strong\u003e - a high-performance vapor-control membrane that creates a \u003cstrong\u003econtinuous vapor control, airtight, and smoke-tight layer\u003c\/strong\u003e across the building envelope. Unlike tapes, foils, or traditional membranes, Passive Purple is \u003cstrong\u003espray or roller-applied\u003c\/strong\u003e, forming a seamless coating that seals even the most complex details.\u003c\/p\u003e\n\u003cp\u003eApplied to the \u003cstrong\u003ewarm side of insulation\u003c\/strong\u003e, Passive Purple prevents unwanted air leakage through walls, floors, roofs, and junctions. It is suitable for both \u003cstrong\u003enew builds\u003c\/strong\u003e and \u003cstrong\u003eretrofit airtightness projects\u003c\/strong\u003e, helping achieve strict UK airtightness standards and Passivhaus performance levels.\u003c\/p\u003e\n\u003ch2\u003eWhy Liquid Airtight Paint?\u003c\/h2\u003e\n\u003cp\u003eAir leakage is one of the biggest causes of \u003cstrong\u003eheat loss, condensation, and mold\u003c\/strong\u003e in buildings. Different materials such as brick, timber, steel, and concrete expand and contract at different rates, creating micro-cracks in plaster and finishing layers. These cracks become hidden leakage points that compromise airtightness tests and waste energy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiquid airtight paint solves this problem.\u003c\/strong\u003e By coating surfaces with Passive Purple, you achieve a \u003cstrong\u003eflexible, durable airtight layer\u003c\/strong\u003e that adapts to movement in the building fabric, ensuring long-term protection against drafts and damp.\u003c\/p\u003e\n\u003ch2\u003eSpray \/ Roller or Brush Application\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpray application:\u003c\/strong\u003e Using an airless machine or roller, one installer can apply up to \u003cstrong\u003e300 m² per day\u003c\/strong\u003e, making it one of the fastest airtightness solutions available.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca rel=\"noopener\" title=\"paint on airtight vapor control\" href=\"https:\/\/intelligentmembranes.com\/products\/passive-purple-internal-airtight-vapour-control-paint-6-9\" target=\"_blank\"\u003e\u003cstrong\u003eBrush application (Passive Purple Brush)\u003c\/strong\u003e\u003c\/a\u003e - A fiber-reinforced version, ideal for sealing junctions, penetrations, cracks (2- 5 mm), and smaller projects such as houses and retrofits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTogether, the spray and brush systems create a \u003cstrong\u003ecomplete airtight solution\u003c\/strong\u003e – from large surface areas to the smallest details.\u003c\/p\u003e\n\u003ch2\u003eSuitability of Passive Purple\u003c\/h2\u003e\n\u003cp\u003ePassive Purple is suitable for all types of building construction - New builds, Retrofits, Traditional build, Light Gauge Steel (LGS)\u003c\/p\u003e\n\u003ch2\u003eThe Benefits of Passive Purple\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003ePassivhaus certified\u003c\/strong\u003e for guaranteed performance\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eSeamless and flexible\u003c\/strong\u003e – no weak points or overlaps\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eRetrofit-ready\u003c\/strong\u003e – apply internally without removing walls\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWater-based and low VOC\u003c\/strong\u003e, safe for indoor use\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWorks on all substrates\u003c\/strong\u003e – brick, block, timber, concrete, drywall, OSB, and steel\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003ePermanent airtight layer\u003c\/strong\u003e – can be plastered, rendered, or painted once cured\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAirtightness, Explained\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is airtightness?\u003c\/strong\u003e Controlling unintended air leakage through the building fabric.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow do you achieve airtightness?\u003c\/strong\u003e By creating a continuous airtight barrier, best achieved with liquid airtight membranes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat are the airtightness standards in the UK?\u003c\/strong\u003e New builds must achieve ≤10 m³\/h·m² @ 50 Pa, while Passivhaus requires ≤0.6 ACH.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy does airtightness matter?\u003c\/strong\u003e It reduces energy loss, improves comfort, prevents condensation, and supports a healthy indoor climate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePassive Purple and Passivhaus\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is Passivhaus?\u003c\/strong\u003e A building standard focused on extreme energy efficiency and occupant comfort. \u003ca href=\"https:\/\/intelligentmembranes.com\/pages\/360-images\" title=\"360 images of liquid applied airtight vapor control\" rel=\"noopener\" target=\"_blank\"\u003eCheck out the 360 images \u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe five principles of Passivhaus:\u003c\/strong\u003e Airtightness, insulation, high-performance glazing, thermal bridge-free design, and ventilation with heat recovery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan it go on Retrofit Projects?\u003c\/strong\u003e Yes, it can; \u003ca rel=\"noopener\" title=\"Retrofit airtightness\" href=\"https:\/\/intelligentmembranes.com\/blogs\/case-study\/airtight-membranes-on-brickwork-seamless-retrofit-sealing-with-passive-purple\" target=\"_blank\"\u003echeck out the case studies \u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca rel=\"noopener\" title=\"examples of smoke tight and airtight liquid vapor controls\" href=\"https:\/\/intelligentmembranes.com\/pages\/blogs\" target=\"_blank\"\u003eExamples of Passivhaus projects\u003c\/a\u003e:\u003c\/strong\u003e Thousands across Europe and the UK now use liquid airtight membranes like Passive Purple to achieve certification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePreparation \u0026amp; Priming\u003c\/h2\u003e\n\u003cp\u003eGreat airtightness starts with the right prep. On bare, dusty, porous or lime substrates, prime first with \u003ca href=\"\/en-us\/products\/lime-prime-10kg\" title=\"Lime Prime\"\u003eLime Prime\u003c\/a\u003e; on dense, sealed or older substrates that need consolidating, use \u003ca href=\"\/en-us\/products\/render-primer-im\" title=\"Primer I.M\"\u003ePrimer I.M\u003c\/a\u003e. Once Passive Purple has cured, prime it with \u003ca href=\"\/en-us\/products\/supergrip-primer-10kg\" title=\"Supergrip primer\"\u003eSupergrip\u003c\/a\u003e so plaster and dot-and-dab (adhesive-set drywall) bond firmly. Right primer, reliable bond.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified - worldwide\u003c\/h2\u003e\n\u003cp\u003ePassive Purple is tested to \u003cstrong\u003eboth ASTM and EN standards\u003c\/strong\u003e, making it suitable for projects worldwide:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrench A+ indoor-air rating \u0026amp; Finnish M1 class\u003c\/strong\u003e - very low VOC emissions (EN 16516 \/ RTS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive House Institute Class A airtight\u003c\/strong\u003e - 0.02 m³\/h·m² @ 50 Pa (EN 12114)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir barrier material\u003c\/strong\u003e - 0.02 L\/s·m² at 75 Pa (ASTM E2178)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire\u003c\/strong\u003e - Class A to ASTM E84 (Flame Spread 0); Euroclass C-s1,d0 to EN 13501-1 (B-s1,d0 with FRED)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight\u003c\/strong\u003e (EN 14891) \u0026amp; intelligent vapor control, Sd ~0.8–40 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar Reflectance Index 52\u003c\/strong\u003e - reflects ~45% of solar energy (ASTM E1980)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRadon barrier\u003c\/strong\u003e - diffusion coefficient 3.3 × 10⁻¹² m²\/s (ISO\/TS 11665-13)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethane \/ ground-gas barrier\u003c\/strong\u003e - low permeability (ISO 15105)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong adhesion\u003c\/strong\u003e - steel 2.7, CLT 1.83, gypsum 1.6, brick 1.5 N\/mm² (EN ISO 4624)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible \u0026amp; crack-bridging\u003c\/strong\u003e - ~219–350% elongation (EN 12311-1)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10\/10 mold resistance\u003c\/strong\u003e - no defacement (ASTM D3273)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Product Declaration\u003c\/strong\u003e (EN 15804)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassivhaus certified \u0026amp; BBA approved\u003c\/strong\u003e; tested to ASTM E2178 and ASTM E84\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Passive Purple Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e🇺🇸 \u003cstrong\u003eUS projects:\u003c\/strong\u003e tested to ASTM standards for world markets - \u003ca href=\"\/en-us\/pages\/us-specifications\" title=\"US specifications in CSI MasterFormat\"\u003edownload the US specifications (CSI MasterFormat)\u003c\/a\u003e or order through \u003ca href=\"\/en-us\/pages\/chicago\" title=\"Passive Purple Chicago — distributed and installed by WickRight\"\u003eWickRight, our Chicago distribution \u0026amp; installation partner\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eWant to understand airtightness and vapor control before you buy? These guides explain how Passive Purple is used on real projects:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Passive Purple Tested \u0026amp; Certified\"\u003ePassive Purple: Tested \u0026amp; Certified (ASTM \u0026amp; EN data)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-class-a-airtight-passive-house-institute\" title=\"Passive House Class A airtight\"\u003ePassive House Institute Class A airtight (EN 12114)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-french-a-plus-emissions-rating\" title=\"French A+ rating\"\u003ePassive Purple: the French A+ indoor-air rating\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/pages\/liquid-airtight-membranes-vs-parge-coating\" title=\"Liquid Airtight Membranes vs Parge Coating\"\u003eLiquid Airtight Membranes vs Parge Coating\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/what-is-a-vapour-control-layer-vcl-explained\" title=\"What Is a Vapor Control Layer? VCL Explained\"\u003eWhat Is a Vapor Control Layer? | VCL Explained\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-01)\u003c\/a\u003e for this product.\u003c\/p\u003e\n\u003ch2\u003eConnect the membrane at windows and junctions\u003c\/h2\u003e\n\u003cp\u003ePlan the adjoining tape detail as well as the coated area. Our \u003ca href=\"\/en-us\/blogs\/educational\/airtightness-tape-guide\"\u003eairtightness tape guide\u003c\/a\u003e covers width and substrate selection, while \u003ca href=\"\/en-us\/blogs\/educational\/airtightness-tape-vs-liquid-airtight-membrane\"\u003etape versus liquid membrane\u003c\/a\u003e explains compatible interfaces, preparation and inspection. Use the specified coating-to-tape detail and check continuity before covering.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608801341780,"sku":"IM\/00PPS11.4","price":99.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_Internal_1.png?v=1792497547"},{"product_id":"passive-purple-internal-airtight-vapour-control-paint-6-9","title":"Passive Purple Brush Home Pack 6.9kg - Airtight Paint","description":"\u003ch2\u003eWhat is Passive Purple Brush?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple Brush\u003c\/strong\u003e is a \u003cstrong\u003efiber-reinforced, liquid-applied airtight membrane\u003c\/strong\u003e designed for detailed airtightness work. Applied with a simple paintbrush, it creates a \u003cstrong\u003epermanent, seamless vapor-control layer\u003c\/strong\u003e that seals tricky gaps and penetrations where spraying or rolling is difficult.\u003c\/p\u003e\n\u003ch3\u003eWhere is it used?\u003c\/h3\u003e\n\u003cp\u003ePassive Purple Brush is ideal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eService penetrations\u003c\/strong\u003e (pipes, cables, ducts)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eWindow and door frames\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFloor-to-wall and wall-to-ceiling junctions\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCracks and gaps up to 5mm\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTouch-ups after air testing\u003c\/strong\u003e or punch-list work\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy use the Brush version?\u003c\/h3\u003e\n\u003cp\u003eUnlike spray-applied Passive Purple, the \u003cstrong\u003eBrush version contains fibers\u003c\/strong\u003e that span and seal larger cracks and irregularities. This makes it the go-to airtight paint for precision work, detailing, and repairs, while still delivering the same \u003cstrong\u003eairtightness performance\u003c\/strong\u003e as the Passivhaus-certified main system.\u003c\/p\u003e\n\u003ch3\u003eSurface preparation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure surfaces are \u003cstrong\u003esolid, dust-free, and closed\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge gaps (\u0026gt; 5 mm):\u003c\/strong\u003e Fill with cement-based filler or foam before application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall to medium gaps (2–5mm):\u003c\/strong\u003e Passive Purple Brush can be applied directly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplication \u0026amp; coverage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApplied with a \u003cstrong\u003eflat paintbrush\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eEasy to use for small projects and detailed work.\u003c\/li\u003e\n\u003cli\u003eOnce cured, it can be \u003cstrong\u003epainted, plastered, or rendered over\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy airtightness matters\u003c\/h3\u003e\n\u003cp\u003eAir leakage through cracks and junctions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReduces energy efficiency\u003c\/li\u003e\n\u003cli\u003eAllows drafts, damp, and mold\u003c\/li\u003e\n\u003cli\u003eCan compromise Passivhaus and building regulations compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBy sealing with Passive Purple Brush, you ensure every junction is airtight, securing energy performance and long-term building health.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified\u003c\/h2\u003e\n\u003cp\u003ePassive Purple Brush is covered by the same independent testing as the Passive Purple system:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrench A+ indoor-air rating \u0026amp; Finnish M1 class\u003c\/strong\u003e - very low VOC emissions (EN 16516 \/ RTS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive House Institute Class A airtight\u003c\/strong\u003e - 0.02 m³\/h·m² @ 50 Pa (EN 12114)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir barrier material\u003c\/strong\u003e - air leakage 0.02 L\/s·m² at 75 Pa (ASTM E2178)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire\u003c\/strong\u003e - Class A to ASTM E84 (Flame Spread 0, Smoke 35); Euroclass C-s1,d0 to EN 13501-1 (B-s1,d0 with FRED)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight\u003c\/strong\u003e (EN 14891) \u0026amp; intelligent vapor control (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong adhesion\u003c\/strong\u003e across substrates (EN ISO 4624) \u0026amp; \u003cstrong\u003e10\/10 mold resistance\u003c\/strong\u003e (ASTM D3273)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBBA approved\u003c\/strong\u003e; tested to ASTM E2178 and ASTM E84 (Passivhaus certification is held by Passive Purple)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSee the full \u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Passive Purple Tested \u0026amp; Certified\"\u003etest data \u0026amp; certifications\u003c\/a\u003e, or read how Passive Purple delivers \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-cool-roof-solar-reflectance-sri-52\" title=\"Passive Purple Solar-Reflective Performance (SRI 52)\"\u003esolar-reflective performance (SRI 52)\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e🇺🇸 \u003cstrong\u003eUS projects:\u003c\/strong\u003e tested to ASTM standards for world markets - \u003ca href=\"\/en-us\/pages\/us-specifications\" title=\"US specifications in CSI MasterFormat\"\u003edownload the US specifications (CSI MasterFormat)\u003c\/a\u003e or order through \u003ca href=\"\/en-us\/pages\/chicago\" title=\"Passive Purple Chicago — distributed and installed by WickRight\"\u003eWickRight, our Chicago distribution \u0026amp; installation partner\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-does-passive-purple-stick-to-adhesion-testing\" title=\"What does Passive Purple stick to?\"\u003eWhat Does Passive Purple Stick To? Adhesion Testing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/builder-forgot-the-vapour-control-layer-how-to-fix-it\" title=\"My Builder Forgot the Vapor Control Layer? Here’s How to Fix It\"\u003eMy Builder Forgot the Vapor Control Layer? Here’s How to Fix It\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/what-is-a-vapour-control-layer-vcl-explained\" title=\"What Is a Vapor Control Layer? | VCL Explained\"\u003eWhat Is a Vapor Control Layer? | VCL Explained\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/the-airtightness-challenge-facing-modern-construction-why-blockwork-alone-is-no-longer-enough\" title=\"The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\"\u003eThe Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/grand-designs-passivhaus-premium-uses-airtight-membrane\" title=\"Grand Designs Passivhaus Premium Uses Airtight Membrane\"\u003eGrand Designs Passivhaus Premium Uses Airtight Membrane\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-02)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"6.9kg","offer_id":53767114850644,"sku":"IM\/00PPB6.9","price":59.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_Home_Pack_1.png?v=1792498643"},{"product_id":"facade-waterproofing-membrane-5kg","title":"Passive Purple External Airtight Fire Rated Façade Waterproofing Membrane (5kg) - Purple Brush","description":"\u003cp\u003e\u003cspan data-teams=\"true\"\u003ePassive Purple External Brush, specifically designed to seal joints and gaps with precision and durability. This advanced liquid-applied weather barrier is perfect for external applications where airtightness and weather protection are critical. The brush version contains specialized fibers, allowing it to span larger gaps and joints, delivering exceptional coverage and performance in challenging areas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified - fire-rated, watertight \u0026amp; breathable\u003c\/h2\u003e\n\u003cp\u003eIndependently certified to both European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire Euroclass B-s1,d0\u003c\/strong\u003e (EN 13501-1, on A1 substrates ≥653 kg\/m³) \u0026amp; \u003cstrong\u003eASTM E84 Class A\u003c\/strong\u003e (Flame Spread 0 \/ Smoke 15)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight Class W1\u003c\/strong\u003e (EN 13859-2) \u0026amp; water permeability Class W3 (EN 1062-3); near-zero water absorption (EN 16302)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable \/ vapor-open\u003c\/strong\u003e - Sd ≈ 0.6 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging\u003c\/strong\u003e A3 (23°C) \/ A4 (-10°C) (EN 1062-7) \u0026amp; CO₂ \/ carbonation barrier Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV-stable\u003c\/strong\u003e (strength increases after 500 h UV) · low-emission \u003cstrong\u003eEMICODE EC2\u003c\/strong\u003e · anti-fungus (rating 0)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKiwa BDA Agrément\u003c\/strong\u003e (BAW-21-214-P-A-UK) · Passive House component (phB) · tested to ICC-ES AC212 criteria (water-resistive barrier)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · read about \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\"\u003ePassive Purple External\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/damp-walls-two-breathable-solutions-that-actually-work\" title=\"Damp Walls? Two Breathable Solutions That Actually Work\"\u003eDamp Walls? Two Breathable Solutions That Actually Work\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-05)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52682707665236,"sku":"IM\/00PPEB5","price":55.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_External_Brush.png?v=1792744807"},{"product_id":"brush-applied-facade-waterproofing-membrane-5kg-bundle","title":"Passive Purple External Brush Pack","description":"\u003cspan lang=\"EN-GB\"\u003eExcelling characteristics of passive purple external: \u003c\/span\u003e\r\n\u003cul type=\"disc\"\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eFire Class B\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eRaintight but vapor breathable\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAirtight\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eUV resistant\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAnti fungus\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eSelf-cleaning \/ reduced dirt pickup caused by UV netting\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCrack-bridging\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCarbonatation block (for concrete); realkalizing (concrete)\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eProtection against salts (for roads) (concrete structures).\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003eCan also be used as a protective coating on concrete as anti-carbonation on concrete \/ cement coating.\u003c\/li\u003e\r\n \t\u003cli\u003e1kg will cover 1m2\u003c\/li\u003e\r\n\u003c\/ul\u003e\n\u003cdiv style=\"border-top:2px solid #b5985a;margin-top:28px;padding-top:18px;\"\u003e\n\u003ch2 style=\"color:#4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608802062676,"sku":"IM\/00PPEBRB","price":64.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/passive_purple_external_brush_pack.png?v=1793205418"},{"product_id":"passive-purple-x-fire-class-b-airtight-paint-5kg","title":"Passive Purple X (5kg) Brush Applied","description":"\u003cp\u003e\u003cspan lang=\"EN-GB\"\u003eKey characteristics of Passive Purple X (shares Passive Purple External's tested performance): \u003c\/span\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eRaintight but vapor breathable\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAirtight\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eUV resistant\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAnti fungus\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eSelf-cleaning \/ reduced dirt pickup caused by UV netting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCrack-bridging\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCarbonatation block (for concrete); realkalizing (concrete)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eProtection against salts (for roads) (concrete structures).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eCan also be used as a protective coating on concrete as anti-carbonation on concrete \/ cement coating.\u003c\/li\u003e\n\u003cli\u003e1kg will cover 1m2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested — fire-rated, watertight \u0026amp; breathable\u003c\/h2\u003e\n\u003cp\u003ePassive Purple X shares the tested performance of Passive Purple External, which has been independently tested to both European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e🔥 \u003cstrong\u003eReaction to fire Euroclass B-s1,d0\u003c\/strong\u003e (EN 13501-1, on A1 substrates ≥653 kg\/m³) \u0026amp; \u003cstrong\u003eASTM E84 Class A\u003c\/strong\u003e (Flame Spread 0 \/ Smoke 15)\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eWatertight Class W1\u003c\/strong\u003e (EN 13859-2) \u0026amp; water permeability Class W3 (EN 1062-3)\u003c\/li\u003e\n\u003cli\u003e🌬️ \u003cstrong\u003eBreathable \/ vapor-open\u003c\/strong\u003e — Sd ≈ 0.6 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e🧱 \u003cstrong\u003eCrack-bridging\u003c\/strong\u003e A3 (23°C) \/ A4 (-10°C) (EN 1062-7) \u0026amp; CO₂ \/ carbonation barrier Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e🇬🇧 \u003cstrong\u003eCertificates\u003c\/strong\u003e — Kiwa BDA Agrément (BAW-21-214-P-A-UK) and Passive House component (phB) are issued for Passive Purple External, not for Passive Purple X · Passive Purple External tested to ICC-ES AC212 criteria (water-resistive barrier)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\"\u003ePassive Purple External explained\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/the-airtightness-challenge-facing-modern-construction-why-blockwork-alone-is-no-longer-enough\" title=\"The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\"\u003eThe Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/how-to-retrofit-vapour-control-without-the-mess-bba-approved-passivhaus-certified-building-control-ready\" title=\"How to Retrofit Vapor Control Without the Mess\"\u003eHow to Retrofit Vapor Control Without the Mess\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-06)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52682702258516,"sku":"IM\/00PPXB5PURPLE","price":55.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_External_Brush_2.png?v=1792672914"},{"product_id":"passivhaus-airtight-sealant","title":"Passivhaus Airtight Sealant - 600ml","description":"\u003cp\u003e\u003cstrong\u003ePassive Purple Sealant Tubes – Perfect for Airtight Sealing of Gaps in the Building Fabric\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple\u003c\/strong\u003e brush in convenient sealant tubes is the ultimate solution for air-sealing gaps and cracks in the building fabric, ensuring airtightness and improved energy efficiency. This flexible, liquid-applied sealant is specifically formulated for quick and easy application, making it ideal for sealing joints, penetrations, and gaps in walls, floors, and ceilings. Designed to meet the highest airtightness standards, \u003cstrong\u003ePassive Purple\u003c\/strong\u003e helps reduce energy loss and is suitable for both new-build and retrofit projects.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features and Benefits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficient Air Sealing:\u003c\/strong\u003e Passive Purple sealant is ideal for sealing gaps and cracks in the building envelope, creating an airtight barrier that prevents air leakage and improves thermal performance. Perfect for use around windows, doors, service penetrations, and joints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick and Easy Application:\u003c\/strong\u003e Sealant tubes allow Passive Purple to be applied directly into gaps and joints using a standard caulking gun, providing precise control and a smooth, seamless finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Use:\u003c\/strong\u003e Suitable for a wide range of substrates including timber, concrete, brick, and plasterboard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable and Long-Lasting:\u003c\/strong\u003e Once applied, Passive Purple forms a flexible, durable seal that accommodates building movement and environmental changes while maintaining airtightness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy Efficiency:\u003c\/strong\u003e By eliminating air leaks, Passive Purple helps reduce energy loss, lowers heating and cooling costs, and supports energy-efficient, sustainable construction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Choose Passive Purple in Sealant Tubes?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Application:\u003c\/strong\u003e Sealant tubes allow targeted application, ensuring even the smallest gaps are effectively sealed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Energy Performance:\u003c\/strong\u003e Sealing gaps with Passive Purple significantly reduces air infiltration, improving comfort and overall thermal performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect for Retrofit and New Builds:\u003c\/strong\u003e Whether sealing a new building or upgrading an existing structure, Passive Purple sealant tubes offer a practical and reliable airtightness solution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAchieve superior airtightness with \u003cstrong\u003ePassive Purple Sealant Tubes\u003c\/strong\u003e — an easy-to-use, flexible solution for sealing gaps in the building fabric. Ideal for improving energy efficiency and sealing joints in both new and retrofit projects, \u003cstrong\u003ePassive Purple\u003c\/strong\u003e delivers a durable, long-lasting airtight seal.\u003c\/p\u003e\n\u003cp\u003eEach sausage covers approximately \u003cstrong\u003e6 linear metres\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv style=\"border-top:2px solid #b5985a;margin-top:28px;padding-top:18px;\"\u003e\n\u003ch2 style=\"color:#4a1a6e;\"\u003eTest data — worldwide\u003c\/h2\u003e\n\u003cp\u003ePassive Purple in sealant tubes is the same Passive Purple liquid airtight membrane formulation. Passive Purple has been independently tested to \u003cstrong\u003eboth ASTM and EN standards\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e🌿 \u003cstrong\u003eFrench A+ indoor-air rating \u0026amp; Finnish M1 class\u003c\/strong\u003e — very low VOC emissions (EN 16516 \/ RTS)\u003c\/li\u003e\n\u003cli\u003e🏠 \u003cstrong\u003ePassive House Institute Class A airtight\u003c\/strong\u003e — 0.02 m³\/h·m² @ 50 Pa (EN 12114)\u003c\/li\u003e\n\u003cli\u003e🔒 \u003cstrong\u003eAir barrier material\u003c\/strong\u003e — 0.02 L\/s·m² at 75 Pa (ASTM E2178)\u003c\/li\u003e\n\u003cli\u003e🔥 \u003cstrong\u003eReaction to fire\u003c\/strong\u003e — Class A to ASTM E84; Euroclass C-s1,d0 to EN 13501-1 (B-s1,d0 with FRED)\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eWatertight\u003c\/strong\u003e (EN 14891) \u0026amp; intelligent vapour control, Sd ~0.8–40 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e🧱 \u003cstrong\u003eStrong adhesion\u003c\/strong\u003e — steel 2.7, CLT 1.83, gypsum 1.6, brick 1.5 N\/mm² (EN ISO 4624)\u003c\/li\u003e\n\u003cli\u003e🦠 \u003cstrong\u003e10\/10 mould resistance\u003c\/strong\u003e (ASTM D3273) · 🛡️ radon \u0026amp; methane barrier · ♻️ EPD (EN 15804)\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCertificates\u003c\/strong\u003e — Passivhaus certification and BBA approval are held by Passive Purple, not by this sealant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Passive Purple Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top:2px solid #b5985a;margin-top:28px;padding-top:18px;\"\u003e\n\u003ch2 style=\"color:#4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/builder-forgot-the-vapour-control-layer-how-to-fix-it\" title=\"My Builder Forgot the Vapour Control Layer? Here’s How to Fix It\"\u003eMy Builder Forgot the Vapour Control Layer? Here’s How to Fix It\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/what-is-a-vapour-control-layer-vcl-explained\" title=\"What Is a Vapour Control Layer? | VCL Explained\"\u003eWhat Is a Vapour Control Layer? | VCL Explained\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Intelligent Membranes","offers":[{"title":"1","offer_id":52608802292052,"sku":"IM\/00PHSS","price":12.0,"currency_code":"GBP","in_stock":true},{"title":"12","offer_id":52608802324820,"sku":"IM\/00PHSB","price":144.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passivhaus-Sealant_-White-and-Purple_png.webp?v=1784733153"},{"product_id":"poseidon-waterproof-membrane-paint-7kg","title":"Poseidon - Bathroom \u0026 Wetroom Waterproofing Membrane Paint (6kg, 12kg) - Spray \/ Roller","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003ePoseidon Bathroom \u0026amp; Wetroom Waterproofing Membrane Paint is a liquid-applied, polymer-based membrane available in 6kg and 12kg containers. Designed for use with spray, roller, or brush application, it provides a seamless, durable waterproofing layer suitable for high-moisture environments. This waterproofing membrane is formulated to create a long-lasting vapor barrier that protects wet areas from water ingress and vapour penetration. Its flexible composition allows it to accommodate building movement without cracking, ensuring ongoing waterproof performance in bathrooms, steam rooms, and wetrooms prior to tiling installations.\u003c\/p\u003e\n\u003ch3\u003eMaterials and Composition\u003c\/h3\u003e\n\u003cp\u003eThe Poseidon waterproofing membrane is a polymer-based, liquid-applied membrane that cures into a flexible, seamless film. It is engineered for durability and resistance to water vapour transmission, with adhesion tailored to various substrates such as concrete, cementitious substrates, and tiles. The membrane forms a robust barrier that is resistant to UV exposure, chemicals, and environmental wear, suitable for continuous contact with moisture and steam.\u003c\/p\u003e\n\u003ch3\u003eDimensions and Capacity\u003c\/h3\u003e\n\u003cp\u003eThe product is available in 6kg and 12kg containers, with coverage dependent on application thickness. The membrane supports consistent, even coverage when applied via spray, roller, or brush, with a recommended minimum thickness of 1mm for effective waterproofing.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Vapour Barrier Performance\u003c\/strong\u003e – Provides a complete vapor block to prevent moisture transmission in wet areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless and Flexible\u003c\/strong\u003e – Cures into a continuous membrane that accommodates building movement without cracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Application Options\u003c\/strong\u003e – Suitable for spray, roller, or brush application, enabling quick installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Long-Term Waterproofing\u003c\/strong\u003e – Offers reliable protection against water ingress and vapour penetration for years of use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdhesive Compatibility\u003c\/strong\u003e – Bonds effectively to concrete, cement-based substrates, and tiles, ensuring a secure and waterproof installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIdeal Use Cases and User Recommendations\u003c\/h3\u003e\n\u003cp\u003eThe Poseidon waterproofing membrane is ideal for professionals and DIYers working on bathrooms, steam rooms, wetrooms, and other high-moisture environments where maximum vapour and water protection are required. It is suitable for both new installations and refurbishments, particularly in situations where moisture control and long-term waterproofing are priorities. The membrane’s easy application process makes it suitable for rapid projects, minimizing downtime and labor effort.\u003c\/p\u003e\n\u003ch3\u003eIncluded Items and Additional Details\u003c\/h3\u003e\n\u003cp\u003eEach order includes the selected volume of Poseidon waterproofing membrane paint in a ready-to-use container. No additional tools are included, but rollers, brushes, or spraying equipment are recommended based on application preference. The product is not designed for coverage of structural elements outside wet areas; it should be used as part of a complete waterproofing system.\u003c\/p\u003e\n\u003ch3\u003eCare, Maintenance, and Storage\u003c\/h3\u003e\n\u003cp\u003eAfter curing, the membrane requires no special maintenance. It can be cleaned with water and mild detergents if necessary. The product should be stored in a cool, dry place, away from direct sunlight, and kept tightly sealed to prevent contamination. For optimal longevity, avoid exposure to extreme temperatures and UV light. The membrane offers long-term waterproofing with proper application and handling.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified — wetroom waterproofing\u003c\/h2\u003e\n\u003cp\u003ePoseidon is independently certified to both European and US standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eEuropean Technical Assessment ETA-23\/0378\u003c\/strong\u003e (CE) — 25-year assessed working life\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eWatertight \u0026amp; crack-bridging\u003c\/strong\u003e — EN 14891 (no water penetration; 0.4 mm crack-bridging; watertight through 2 mm joint movement)\u003c\/li\u003e\n\u003cli\u003e🛁 \u003cstrong\u003eTile-adhesive bond retained\u003c\/strong\u003e after water, heat \u0026amp; chlorinated (pool\/spa) water — EN 14891\u003c\/li\u003e\n\u003cli\u003e🇺🇸 \u003cstrong\u003eANSI A118.10\u003c\/strong\u003e (waterproof) \u0026amp; \u003cstrong\u003eA118.12\u003c\/strong\u003e crack isolation (High Performance); zero-VOC emissions (CA 01350)\u003c\/li\u003e\n\u003cli\u003e🧱 \u003cstrong\u003eStrong adhesion\u003c\/strong\u003e — brick, block, screed, tile \u0026amp; gypsum (1.0–1.6 N\/mm², EN ISO 4624) · ♻️ EPD (EN 15804)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · \u003ca href=\"\/en-us\/blogs\/educational\/what-an-eta-means-poseidon-wetroom-waterproofing-certified\"\u003eWhat an ETA means\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003e🌎 Tested for World Markets — ASTM (US) \u0026amp; EN (Europe)\u003c\/h2\u003e\n\u003cp\u003ePoseidon is tested to US ASTM standards alongside European (EN) certifications for world markets, so the same wetroom waterproofing membrane can be specified for projects in the UK, Europe and North America.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUS architects \u0026amp; specifiers: \u003ca href=\"\/en-us\/pages\/us-specifications\" title=\"US specifications in CSI MasterFormat\"\u003edownload the US specifications (CSI MasterFormat)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eUS supply: \u003ca href=\"\/en-us\/pages\/chicago\" title=\"Passive Purple Chicago — distributed and installed by WickRight\"\u003eWickRight, our Chicago distribution partner\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/nhbc-standards-2023-waterproof-membranes-as-a-tanking-system\" title=\"NHBC Standards 2023: Waterproof Membranes as a Tanking System\"\u003eNHBC Standards 2023: Waterproof Membranes as a Tanking System\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/five-things-about-waterproofing\" title=\"Five Things About Waterproofing\"\u003eFive Things About Waterproofing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/damp-proofing-vs-waterproofing-what-is-the-difference\" title=\"Damp Proofing vs Waterproofing: What is the Difference?\"\u003eDamp Proofing vs Waterproofing: What is the Difference?\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-08)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"6kg","offer_id":52683355619668,"sku":"IM\/00POS6","price":60.0,"currency_code":"GBP","in_stock":true},{"title":"12kg","offer_id":53685103231316,"sku":"IM\/00POS12","price":119.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Poseidon_6KG.png?v=1792501756"},{"product_id":"waterproof-blue-liquid-dpm-10kg","title":"Waterproof Blue Liquid DPM (10KG) - Roller applied liquid DPM","description":"\u003cp\u003eWaterproof Blue is a premium polymer-modified liquid membrane engineered for comprehensive foundation and floor protection. \u003c\/p\u003e\n\u003cp\u003eThis heavy-duty formulation delivers seamless waterproofing whilst simultaneously blocking vapour transmission and resisting UV degradation. Unlike conventional coatings that crack and peel under structural movement, Waterproof Blue maintains elasticity and adhesion, providing long-term durability on foundation walls, concrete slabs, basement floors, and external surfaces.\u003c\/p\u003e\n\u003cp\u003eThe liquid application method, by roller or brush, creates a monolithic barrier without joints or weak points, eliminating the need for corner reinforcement. Ideal for both new construction and retrofit projects, it bridges cracks effectively whilst remaining flexible when cured. Suitable for horizontal and vertical applications where moisture and groundwater pressure demand reliable, non-negotiable protection.\u003c\/p\u003e\n\u003cp\u003eNot sure which damp you are treating? Our \u003ca href=\"\/en-us\/pages\/damp-proofing\"\u003edamp proofing page\u003c\/a\u003e works by telling rising, penetrating and condensation damp apart before a product is chosen.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eOn a block and beam floor - see it in 360°\u003c\/h2\u003e\n\u003cp\u003eWaterproof Blue rolled across a block and beam floor, taken over the block joints and up to the perimeter so the floor is sealed as one surface rather than sheet by sheet. Look around to see how far the coated area runs before any screed goes down.\u003c\/p\u003e\n\u003cfigure style=\"margin: 20px 0; padding: 0;\"\u003e\n\u003cdiv style=\"position: relative; padding-top: 56.25%; background: #f4f4f4; border-radius: 6px; overflow: hidden;\"\u003e\u003ciframe src=\"https:\/\/kuula.co\/share\/Ln89y?logo=1\u0026amp;info=1\u0026amp;fs=1\u0026amp;vr=0\u0026amp;zoom=1\u0026amp;sd=1\u0026amp;thumbs=1\" title=\"Block and beam floor sealed with Waterproof Blue liquid DPM — 360 degree site tour\" loading=\"lazy\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cfigcaption style=\"margin-top: 10px; font-size: 0.9rem;\"\u003eClick and drag to look around. \u003ca href=\"\/en-us\/pages\/360-images\"\u003eSee all our 360° site tours\u003c\/a\u003e.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/damp-proofing-vs-waterproofing-what-is-the-difference\" title=\"Damp Proofing vs Waterproofing: What is the Difference?\"\u003eDamp Proofing vs Waterproofing: What is the Difference?\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/nhbc-standards-2023-waterproof-membranes-as-a-tanking-system\" title=\"NHBC Standards 2023: Waterproof Membranes as a Tanking System\"\u003eNHBC Standards 2023: Waterproof Membranes as a Tanking System\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/rising-damp-how-to-spot-it-and-stop-it\" title=\"Rising Damp: How to Spot It and Stop It for Good\"\u003eRising Damp: How to Spot It and Stop It for Good\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-09)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608805306708,"sku":"IM\/00WPBR10","price":99.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Waterproof_Blue_Liquid_DPM.png?v=1792500436"},{"product_id":"waterproof-blue-liquid-dpm-5kg","title":"Waterproof Blue Liquid DPM (5KG) - Brush applied Liquid DPM","description":"\u003ch2 data-start=\"160\" data-end=\"189\"\u003e💙 Waterproof Blue – 5KG\u003c\/h2\u003e\n\u003cp data-start=\"190\" data-end=\"266\"\u003e\u003cstrong data-start=\"190\" data-end=\"266\"\u003ePrecision Waterproofing. Brush Applied. Built for Structural Protection.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"268\" data-end=\"485\"\u003eWaterproof Blue 5KG is the brush-grade version of our high-performance polymer waterproofing membrane — designed for controlled application on \u003cstrong data-start=\"411\" data-end=\"484\"\u003efoundations, floors, and critical detailing areas like window reveals\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"487\" data-end=\"689\"\u003eThis is structural waterproofing made simple. It blocks water, stops vapour migration, resists UV degradation, and cures to form a seamless, flexible membrane that won’t crack or disintegrate over time.\u003c\/p\u003e\n\u003cp data-start=\"691\" data-end=\"751\"\u003ePerfect where accuracy matters and rollers aren’t practical.\u003c\/p\u003e\n\u003chr data-start=\"753\" data-end=\"756\"\u003e\n\u003ch2 data-start=\"758\" data-end=\"773\"\u003e🏗 Ideal For\u003c\/h2\u003e\n\u003cul data-start=\"775\" data-end=\"962\"\u003e\n\u003cli data-start=\"775\" data-end=\"797\"\u003e\n\u003cp data-start=\"777\" data-end=\"797\"\u003e\u003cstrong data-start=\"777\" data-end=\"797\"\u003eFoundation walls\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"798\" data-end=\"827\"\u003e\n\u003cp data-start=\"800\" data-end=\"827\"\u003e\u003cstrong data-start=\"800\" data-end=\"827\"\u003eConcrete floors \u0026amp; slabs\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"828\" data-end=\"852\"\u003e\n\u003cp data-start=\"830\" data-end=\"852\"\u003e\u003cstrong data-start=\"830\" data-end=\"852\"\u003eBasement detailing\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"853\" data-end=\"886\"\u003e\n\u003cp data-start=\"855\" data-end=\"886\"\u003e\u003cstrong data-start=\"855\" data-end=\"886\"\u003eWindow reveal waterproofing\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"887\" data-end=\"911\"\u003e\n\u003cp data-start=\"889\" data-end=\"911\"\u003eUpstands and junctions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"912\" data-end=\"962\"\u003e\n\u003cp data-start=\"914\" data-end=\"962\"\u003eTight or intricate areas requiring brush control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"964\" data-end=\"1048\"\u003eEspecially suited for detailing around openings where water ingress risk is highest.\u003c\/p\u003e\n\u003chr data-start=\"1050\" data-end=\"1053\"\u003e\n\u003ch2 data-start=\"1055\" data-end=\"1072\"\u003e🛠 Application\u003c\/h2\u003e\n\u003cul data-start=\"1074\" data-end=\"1197\"\u003e\n\u003cli data-start=\"1074\" data-end=\"1104\"\u003e\n\u003cp data-start=\"1076\" data-end=\"1104\"\u003eApply using a \u003cstrong data-start=\"1090\" data-end=\"1104\"\u003epaintbrush\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1105\" data-end=\"1155\"\u003e\n\u003cp data-start=\"1107\" data-end=\"1155\"\u003eIdeal for precision work and controlled coverage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1156\" data-end=\"1197\"\u003e\n\u003cp data-start=\"1158\" data-end=\"1197\"\u003eCreates a seamless, joint-free membrane\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1199\" data-end=\"1259\"\u003eNo corner reinforcement required — saving installation time.\u003c\/p\u003e\n\u003chr data-start=\"1261\" data-end=\"1264\"\u003e\n\u003ch2 data-start=\"1266\" data-end=\"1305\"\u003e🔵 Why Choose the 5KG Brush Version?\u003c\/h2\u003e\n\u003cul data-start=\"1307\" data-end=\"1700\"\u003e\n\u003cli data-start=\"1307\" data-end=\"1381\"\u003e\n\u003cp data-start=\"1309\" data-end=\"1381\"\u003e🎯 \u003cstrong data-start=\"1312\" data-end=\"1343\"\u003eDetail-Friendly Application\u003c\/strong\u003e – Perfect for reveals and junctions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1382\" data-end=\"1433\"\u003e\n\u003cp data-start=\"1384\" data-end=\"1433\"\u003e☀ \u003cstrong data-start=\"1386\" data-end=\"1402\"\u003eUV Resistant\u003c\/strong\u003e – Suitable for exposed areas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1434\" data-end=\"1506\"\u003e\n\u003cp data-start=\"1436\" data-end=\"1506\"\u003e💧 \u003cstrong data-start=\"1439\" data-end=\"1469\"\u003eVapour Blocking Technology\u003c\/strong\u003e – Protects from moisture migration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1507\" data-end=\"1577\"\u003e\n\u003cp data-start=\"1509\" data-end=\"1577\"\u003e🔧 \u003cstrong data-start=\"1512\" data-end=\"1546\"\u003eHigh Crack-Bridging Properties\u003c\/strong\u003e – Handles substrate movement\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1578\" data-end=\"1634\"\u003e\n\u003cp data-start=\"1580\" data-end=\"1634\"\u003e🧱 \u003cstrong data-start=\"1583\" data-end=\"1632\"\u003eStrong Adhesion to Concrete \u0026amp; Cement Surfaces\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1635\" data-end=\"1700\"\u003e\n\u003cp data-start=\"1637\" data-end=\"1700\"\u003e⏳ \u003cstrong data-start=\"1639\" data-end=\"1667\"\u003eFlexible, Durable Finish\u003c\/strong\u003e – No brittle failure over time\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1702\" data-end=\"1705\"\u003e\n\u003ch2 data-start=\"1707\" data-end=\"1746\"\u003e🧪 Techy Corner (For the Specifiers)\u003c\/h2\u003e\n\u003cp data-start=\"1748\" data-end=\"1870\"\u003eWaterproof Blue is a \u003cstrong data-start=\"1769\" data-end=\"1822\"\u003epolymer-based, liquid-applied waterproof membrane\u003c\/strong\u003e that cures into a flexible elastomeric barrier.\u003c\/p\u003e\n\u003cul data-start=\"1872\" data-end=\"2093\"\u003e\n\u003cli data-start=\"1872\" data-end=\"1936\"\u003e\n\u003cp data-start=\"1874\" data-end=\"1936\"\u003eDesigned for vertical and horizontal structural applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1937\" data-end=\"1981\"\u003e\n\u003cp data-start=\"1939\" data-end=\"1981\"\u003eHigh adhesion to cementitious substrates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1982\" data-end=\"2012\"\u003e\n\u003cp data-start=\"1984\" data-end=\"2012\"\u003eCrack-bridging performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2013\" data-end=\"2055\"\u003e\n\u003cp data-start=\"2015\" data-end=\"2055\"\u003eSeamless monolithic membrane formation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2056\" data-end=\"2093\"\u003e\n\u003cp data-start=\"2058\" data-end=\"2093\"\u003eMaintains elasticity after curing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2095\" data-end=\"2259\"\u003eOnce applied and cured, it forms a continuous waterproof layer protecting structural elements from water ingress, vapour penetration, and environmental degradation.\u003c\/p\u003e\n\u003cdiv style=\"border-top:2px solid #b5985a;margin-top:28px;padding-top:18px;\"\u003e\n\u003ch2 style=\"color:#4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/damp-proofing-vs-waterproofing-what-is-the-difference\" title=\"Damp Proofing vs Waterproofing: What is the Difference?\"\u003eDamp Proofing vs Waterproofing: What is the Difference?\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/rising-damp-how-to-spot-it-and-stop-it\" title=\"Rising Damp: How to Spot It and Stop It for Good\"\u003eRising Damp: How to Spot It and Stop It for Good\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-09)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608805372244,"sku":"IM\/00WPBB5","price":69.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Waterproof_Blue_Brush.png?v=1792673060"},{"product_id":"passive-purple-x-10kg-white-spray-roller","title":"Passive Purple X (10kg) - Spray\/Roller","description":"\u003ch2\u003eWhat is Passive Purple X and How Does it Work?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple X\u003c\/strong\u003e is a \u003cstrong\u003efire-rated, airtight, watertight and breathable liquid membrane\u003c\/strong\u003e for new-build projects. It is \u003cstrong\u003espray or roller-applied\u003c\/strong\u003e to form one seamless coating, replacing the separate layers and laps of a traditional membrane.\u003c\/p\u003e\n\u003cp\u003eApplied \u003cstrong\u003einternally or externally\u003c\/strong\u003e, it stops air and rain getting through while allowing water vapor to escape, so the building fabric can dry out. It's available in \u003cstrong\u003ewhite, cream, black or purple\u003c\/strong\u003e and shares the tested performance of \u003ca href=\"\/en-us\/products\/passive-purple-external-airtight-fire-rated-facade-waterproofing-membrane-10kg-cream-spray-roller\" title=\"Passive Purple External\"\u003ePassive Purple External\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhy Breathable Airtight Paint?\u003c\/h2\u003e\n\u003cp\u003eTrapped moisture can damage the building fabric, so a wall needs to keep out air and rain while still being able to dry. Using separate products for fire, water, air and vapor also creates more interfaces where a detail can fail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple X brings those functions together in one continuous layer.\u003c\/strong\u003e With a vapor resistance of \u003cstrong\u003eSd ≈ 0.6 m\u003c\/strong\u003e, it lets moisture escape while the coating sheds rain.\u003c\/p\u003e\n\u003cp\u003eIt isn't a vapor control layer. Where your design needs one, use \u003ca href=\"\/en-us\/products\/passive-purple-internal-airtight-vapour-control-paint-11-4kg\" title=\"Passive Purple\"\u003ePassive Purple\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eSpray \/ Roller or Brush Application\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpray application:\u003c\/strong\u003e Using an airless machine, one installer can cover up to \u003cstrong\u003e300 m² per day\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoller application:\u003c\/strong\u003e Ideal if you don't have a spray machine to hand.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-us\/products\/passive-purple-x-fire-class-b-airtight-paint-5kg\" title=\"Passive Purple X Brush\"\u003e\u003cstrong\u003eBrush application (Passive Purple X Brush):\u003c\/strong\u003e\u003c\/a\u003e A 5kg brush-applied version.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSuitability of Passive Purple X\u003c\/h2\u003e\n\u003cp\u003ePassive Purple X is designed primarily for \u003cstrong\u003enew builds\u003c\/strong\u003e, for internal and external use, and can be applied to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConcrete, brick and concrete block (CMU)\u003c\/li\u003e\n\u003cli\u003eOSB and engineered timber panels\u003c\/li\u003e\n\u003cli\u003eFiber cement boards and drywall (gypsum board)\u003c\/li\u003e\n\u003cli\u003eInsulation panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWorking on an existing building?\u003c\/strong\u003e Take a look at \u003ca href=\"\/en-us\/products\/passive-purple-retrofit-airtightness-10kg\" title=\"Passive Purple Retrofit\"\u003ePassive Purple Retrofit\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFire rating:\u003c\/strong\u003e The Euroclass B-s1,d0 classification applies on A1 substrates with a density of at least 653 kg\/m³. The designer and building control body should confirm suitability against the building's fire strategy.\u003c\/p\u003e\n\u003ch2\u003eThe Benefits of Passive Purple X\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eFire rated:\u003c\/strong\u003e Euroclass B-s1,d0 on qualifying substrates and ASTM E84 Class A\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eAirtight and smoke-tight:\u003c\/strong\u003e One continuous, seamless layer\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWatertight but breathable:\u003c\/strong\u003e Keeps rain out and lets vapor escape\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCrack-bridging:\u003c\/strong\u003e Tested at 23°C and -10°C\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eUV-stable:\u003c\/strong\u003e Tensile strength increases after 500 hours of UV exposure\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eProtects concrete:\u003c\/strong\u003e Class C1 CO₂ and carbonation barrier\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWater-based and low emission:\u003c\/strong\u003e EMICODE EC2 rated\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAirtightness and Breathability, Explained\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is airtightness?\u003c\/strong\u003e Controlling unintended air leakage through the building fabric.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat does breathable mean?\u003c\/strong\u003e Water vapor can pass through the membrane, while liquid water and air can't.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat are the airtightness standards?\u003c\/strong\u003e New homes in England must achieve 8 m³\/(h·m²) at 50 Pa or better, while Passivhaus requires ≤0.6 ACH.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy does it matter?\u003c\/strong\u003e Good airtightness reduces energy loss and improves comfort, while breathability allows the building fabric to dry.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePassive Purple X and Passivhaus\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is Passivhaus?\u003c\/strong\u003e A building standard focused on extreme energy efficiency and occupant comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat are the five principles?\u003c\/strong\u003e Airtightness, insulation, high-performance glazing, thermal bridge-free design, and ventilation with heat recovery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the certification?\u003c\/strong\u003e Passive Purple X does not hold its own certificates. The Passive House Institute component certificate (\u003cstrong\u003eClass phB\u003c\/strong\u003e) and Kiwa BDA Agrément are issued for Passive Purple External.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePreparation \u0026amp; Application\u003c\/h2\u003e\n\u003cp\u003eGreat airtightness starts with the right prep:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRemove salt efflorescence, dust, loose material and standing water. Damp surfaces are fine.\u003c\/li\u003e\n\u003cli\u003eMake sure the surface is closed, filling holes and joints with a fast-setting cement-based product or polyurethane foam.\u003c\/li\u003e\n\u003cli\u003eDon't add water or solvents.\u003c\/li\u003e\n\u003cli\u003eDon't apply below 5°C (air and substrate temperature), in full sunlight or during rain.\u003c\/li\u003e\n\u003cli\u003eApply two coats, letting the first dry before applying the second.\u003c\/li\u003e\n\u003cli\u003eClean tools with water after use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow Much Will You Need?\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSubstrate\u003c\/th\u003e\n\u003cth\u003eApprox. coverage\u003c\/th\u003e\n\u003cth\u003ePer 10kg tub\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOSB and drywall\u003c\/td\u003e\n\u003ctd\u003e0.8–1.0 kg\/m²\u003c\/td\u003e\n\u003ctd\u003e10–12 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConcrete block and brickwork\u003c\/td\u003e\n\u003ctd\u003e1.0–1.2 kg\/m²\u003c\/td\u003e\n\u003ctd\u003e8–10 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eCoverage varies with substrate type, porosity and surface condition. Use a wet film gauge to check thickness during application.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested\u003c\/h2\u003e\n\u003cp\u003ePassive Purple X shares the tested performance of Passive Purple External, which has been independently tested to European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire:\u003c\/strong\u003e Euroclass B-s1,d0 (EN 13501-1, on A1 substrates ≥653 kg\/m³) and ASTM E84 Class A (Flame Spread 0, Smoke 15)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight:\u003c\/strong\u003e Class W1 (EN 13859-2), water permeability Class W3 (EN 1062-3) and near-zero water absorption (EN 16302)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable:\u003c\/strong\u003e Sd ≈ 0.6 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging:\u003c\/strong\u003e A3 at 23°C and A4 at -10°C (EN 1062-7)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbonation barrier:\u003c\/strong\u003e CO₂ Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdhesion:\u003c\/strong\u003e Up to 1.23 N\/mm² on CLT (EN ISO 4624)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow emission:\u003c\/strong\u003e EMICODE EC2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-fungus:\u003c\/strong\u003e Rating 0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUS water-resistive barrier:\u003c\/strong\u003e Passive Purple External tested to ICC-ES AC212 criteria\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificates:\u003c\/strong\u003e Kiwa BDA Agrément (BAW-21-214-P-A-UK) and Passive House component (Class phB) are issued for Passive Purple External, not for Passive Purple X\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\" title=\"Passive Purple External: Fire Class B, Watertight and Breathable\"\u003ePassive Purple External: Fire Class B, Watertight and Breathable\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/the-airtightness-challenge-facing-modern-construction-why-blockwork-alone-is-no-longer-enough\" title=\"The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\"\u003eThe Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-06)\u003c\/a\u003e for this product.\u003c\/p\u003e\n\u003ch2\u003eConnect the Membrane at Windows and Junctions\u003c\/h2\u003e\n\u003cp\u003ePlan the adjoining tape detail as well as the coated area. Our \u003ca href=\"\/en-us\/blogs\/educational\/airtightness-tape-guide\"\u003eairtightness tape guide\u003c\/a\u003e covers width and substrate selection, while \u003ca href=\"\/en-us\/blogs\/educational\/airtightness-tape-vs-liquid-airtight-membrane\"\u003etape versus liquid membrane\u003c\/a\u003e explains compatible interfaces, preparation and inspection. Use the specified coating-to-tape detail and check continuity before covering.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"White","offer_id":52683125358932,"sku":"IM\/00PPXS10WHITE","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Cream","offer_id":52683125260628,"sku":"IM\/00PPXS10CREAM","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":52683125293396,"sku":"IM\/00PPXS10BLACK","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Purple","offer_id":52683125326164,"sku":"IM\/00PPXS10PURPLE","price":119.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_X_3.png?v=1792672329"},{"product_id":"passive-purple-external-airtight-fire-rated-facade-waterproofing-membrane-10kg-cream-spray-roller","title":"Passive Purple External Airtight Fire Rated Façade Waterproofing Membrane (10kg) - Spray \/ Roller","description":"\u003ch3\u003eKey Characteristics of Passive Purple External\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple External\u003c\/strong\u003e is a \u003cstrong\u003eFire Class B (Euroclass B-s1,d0) liquid-applied airtight paint\u003c\/strong\u003e for both \u003cstrong\u003einternal and external applications\u003c\/strong\u003e. It combines airtightness, weather protection, and intelligent moisture management in a single certified solution.\u003c\/p\u003e\n\u003ch4\u003eKey Benefits \u0026amp; Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire Class B\u003c\/strong\u003e – exceptional fire resistance, setting it apart from standard membranes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRaintight \u0026amp; Vapor Breathable\u003c\/strong\u003e – keeps water out while allowing moisture to escape, ensuring a healthy building fabric.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirtight \u0026amp; Smoke-Tight\u003c\/strong\u003e – delivers a complete barrier to uncontrolled air leakage and smoke movement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV Resistant \u0026amp; Self-Cleaning\u003c\/strong\u003e – long-term durability with reduced dirt pickup and surface staining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Fungus Protection\u003c\/strong\u003e – prevents mold growth and safeguards indoor air quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-Bridging\u003c\/strong\u003e – maintains airtightness even where movement or minor cracks occur.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcrete Protection\u003c\/strong\u003e – blocks carbonation, provides realkalization, and shields against salts from roads and de-icing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Purpose\u003c\/strong\u003e – suitable for \u003cstrong\u003einternal and external\u003c\/strong\u003e applications across retrofit and new-build projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntelligent Moisture Management\u003c\/strong\u003e – allows the substrate to breathe, balancing vapor openness with airtight performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith \u003cstrong\u003ePassive Purple External\u003c\/strong\u003e, you get \u003cstrong\u003eairtightness, weather resistance, and long-term structural protection\u003c\/strong\u003e in one advanced, certified liquid membrane, ideal for timber frame, retrofit, and high-performance construction projects.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified - fire-rated, watertight \u0026amp; breathable\u003c\/h2\u003e\n\u003cp\u003eIndependently certified to both European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire Euroclass B-s1,d0\u003c\/strong\u003e (EN 13501-1, on A1 substrates ≥653 kg\/m³) \u0026amp; \u003cstrong\u003eASTM E84 Class A\u003c\/strong\u003e (Flame Spread 0 \/ Smoke 15)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight Class W1\u003c\/strong\u003e (EN 13859-2) \u0026amp; water permeability Class W3 (EN 1062-3); near-zero water absorption (EN 16302)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable \/ vapor-open\u003c\/strong\u003e - Sd ≈ 0.6 m (EN ISO 12572), so the wall dries outward\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging\u003c\/strong\u003e A3 (23°C) \/ A4 (-10°C) (EN 1062-7) \u0026amp; CO₂ \/ carbonation barrier Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV-stable\u003c\/strong\u003e (strength increases after 500 h UV) · low-emission \u003cstrong\u003eEMICODE EC2\u003c\/strong\u003e · anti-fungus (rating 0)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKiwa BDA Agrément\u003c\/strong\u003e (BAW-21-214-P-A-UK) · Passive House component (phB) · tested to ICC-ES AC212 criteria (water-resistive barrier)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · Read about \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\"\u003ePassive Purple External\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003e🌎 Tested for World Markets - ASTM (US) \u0026amp; EN (Europe)\u003c\/h2\u003e\n\u003cp\u003ePassive Purple External is fire-rated to \u003cstrong\u003eASTM E84 Class A (US)\u003c\/strong\u003e and \u003cstrong\u003eEN fire Class B (Europe)\u003c\/strong\u003e - tested to US ASTM standards alongside its European certifications so that the same fire-rated façade membrane can be specified on both sides of the Atlantic.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUS architects \u0026amp; specifiers: \u003ca href=\"\/en-us\/pages\/us-specifications\" title=\"US specifications in CSI MasterFormat\"\u003edownload the US specifications (CSI MasterFormat)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eUS supply \u0026amp; install: \u003ca href=\"\/en-us\/pages\/chicago\" title=\"Passive Purple Chicago — distributed and installed by WickRight\"\u003eWickRight, our Chicago distribution \u0026amp; installation partner\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eFire-rated range: \u003ca href=\"\/en-us\/collections\/fire-protection\" title=\"Fire protection collection\"\u003eshop the full fire protection collection\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/damp-walls-two-breathable-solutions-that-actually-work\" title=\"Damp Walls? Two Breathable Solutions That Actually Work\"\u003eDamp Walls? Two Breathable Solutions That Actually Work\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-05)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52683132174676,"sku":"IM\/00PPE10PURPLE","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":52683132141908,"sku":"IM\/00PPE10BLACK","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Cream","offer_id":52683132207444,"sku":"IM\/00PPE10CREAM","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":52683132240212,"sku":"IM\/00PPE10WHITE","price":119.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_External_df111b0c-cf87-4d71-b782-77c1ea4093dd.png?v=1792499042"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/collections\/Waterproof-Blue-DPM-Spray.png?v=1793269446","url":"https:\/\/intelligentmembranes.com\/en-us\/collections\/wall-membranes.oembed","provider":"Intelligent Membranes","version":"1.0","type":"link"}