{"title":"Intumescent Paints","description":"\u003cp\u003eFire performance and airtightness in one coat. \u003ca href=\"\/en-la\/products\/fred-flame-retardant-paint\"\u003eFRED\u003c\/a\u003e is our fire retardant thermal barrier intumescent coating for timber and spray foam, achieving reaction to fire Class A2-s1,d0. Alongside it sit \u003ca href=\"\/en-la\/products\/passive-purple-x-10kg-white-spray-roller\"\u003ePassive Purple X\u003c\/a\u003e and Passive Purple External, both fire rated Class B, giving you airtight, fire rated membranes for internal walls and façades. Spray, roller or brush applied over timber, OSB, spray foam and blockwork — specify the rating you need and get the airtightness thrown in.\u003c\/p\u003e","products":[{"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 grey – please telephone Intelligent Membranes to discuss these other colours\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-la\/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-la\/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-la\/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-la\/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-la\/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-la\/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":"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 specialised fibres, 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 \/ vapour-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-la\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · read about \u003ca href=\"\/en-la\/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-la\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapour Control for High-Rise Re-Cladding\"\u003eAirtight and Vapour Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/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-la\/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-la\/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":"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 vapour 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); realkalising (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 \/ vapour-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-la\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · \u003ca href=\"\/en-la\/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-la\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapour Control for High-Rise Re-Cladding\"\u003eAirtight and Vapour Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/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-la\/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-la\/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":"passive-purple-retrofit-airtightness-5kg","title":"Passive Purple Retrofit - Retrofit Airtightness Brush Applied Paint (5kg)","description":"\u003ch2\u003ePassive Purple Retrofit Brush – Breathable Airtightness for Existing Buildings\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple Retrofit Brush\u003c\/strong\u003e is a fibre-reinforced, liquid-applied airtight membrane for older and solid-wall buildings that need to breathe. Brushed on internally, it seals joints, gaps, cracks and junctions against draughts and air leakage while staying \u003cstrong\u003evapour open (Sd ≈ 0.6 m)\u003c\/strong\u003e, so moisture in the wall can still dry out.\u003c\/p\u003e\n\u003ch2\u003eWhy Do Older Buildings Need a Breathable Airtight Layer?\u003c\/h2\u003e\n\u003cp\u003eSolid brick, stone and lime-plastered walls were built to manage moisture by letting it move through the wall and dry out. Sealing them with a vapour-tight layer can trap that moisture in the fabric, leading to damp, mould and decay.\u003c\/p\u003e\n\u003cp\u003ePassive Purple Retrofit stops the air leaks that cause heat loss and draughts, but still lets water vapour pass through – so the wall keeps working the way it was designed to.\u003c\/p\u003e\n\u003ch2\u003ePassive Purple or Passive Purple Retrofit?\u003c\/h2\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:16px 0;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"background:#4a1a6e;color:#fff;padding:10px 12px;text-align:left;\"\u003e\u003c\/th\u003e\n\u003cth style=\"background:#4a1a6e;color:#fff;padding:10px 12px;text-align:left;\"\u003ePassive Purple\u003c\/th\u003e\n\u003cth style=\"background:#4a1a6e;color:#fff;padding:10px 12px;text-align:left;\"\u003ePassive Purple Retrofit\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003e\u003cstrong\u003eVapour behaviour\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003eVapour control\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003eVapour open (breathable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003eNew builds and insulated build-ups – applied on the warm side of the insulation\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003eOlder, solid-wall and breathable buildings where moisture must be able to dry out\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003e\u003cstrong\u003eAirtight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border-bottom:1px solid #e0d3ef;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eNot sure which you need? Our \u003ca href=\"\/en-la\/pages\/condensation-risk-analysis\" title=\"Condensation Risk Analysis UK\"\u003econdensation risk analysis\u003c\/a\u003e will tell you, or see \u003ca href=\"\/en-la\/products\/passive-purple-internal-airtight-vapour-control-paint-11-4kg\" title=\"Passive Purple vapour control paint\"\u003ePassive Purple\u003c\/a\u003e for vapour control.\u003c\/p\u003e\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFibre-reinforced:\u003c\/strong\u003e spans larger joints and gaps for reliable detailing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirtight \u0026amp; smoke-tight:\u003c\/strong\u003e stops draughts and uncontrolled air leakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable:\u003c\/strong\u003e vapour open (Sd ≈ 0.6 m) so walls can keep drying out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging:\u003c\/strong\u003e stays sealed as older buildings move.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-fungus:\u003c\/strong\u003e resists mould growth on the coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow emission:\u003c\/strong\u003e EMICODE EC2 rated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-rated:\u003c\/strong\u003e Euroclass B-s1,d0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrush applied:\u003c\/strong\u003e no specialist equipment – ideal for smaller rooms, detailing and DIY retrofits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhere to Use It\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eJoints, gaps and cracks in older walls\u003c\/li\u003e\n\u003cli\u003eJunctions around windows, doors, floors and ceilings\u003c\/li\u003e\n\u003cli\u003ePipe, cable and joist penetrations\u003c\/li\u003e\n\u003cli\u003eSolid brick, stone and lime-plastered walls\u003c\/li\u003e\n\u003cli\u003eSmaller rooms and period homes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor large walls and ceilings, use \u003ca href=\"\/en-la\/products\/passive-purple-retrofit-airtightness-10kg\" title=\"Passive Purple Retrofit Spray\/Roller\"\u003ePassive Purple Retrofit Spray\/Roller (10kg)\u003c\/a\u003e for faster coverage.\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\u003ePassive Purple Retrofit is a product of Passive Purple External. The test results and certificates below are issued for Passive Purple External, not for the Passive Purple Retrofit product name:\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); near-zero water absorption (EN 16302)\u003c\/li\u003e\n\u003cli\u003e🌬️ \u003cstrong\u003eBreathable \/ vapour-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\u003eUV-stable\u003c\/strong\u003e · low-emission \u003cstrong\u003eEMICODE EC2\u003c\/strong\u003e · anti-fungus (rating 0)\u003c\/li\u003e\n\u003cli\u003e🇬🇧 \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-la\/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\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/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\u003cli\u003e\u003ca href=\"\/en-la\/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\u003cli\u003e\u003ca href=\"\/en-la\/blogs\/news\/enerphit-explained-the-passivhaus-standard-for-old-buildings\" title=\"EnerPHit Explained – The Passivhaus Standard for Old Buildings\"\u003eEnerPHit Explained – The Passivhaus Standard for Old Buildings\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-la\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-07)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52682700194132,"sku":"IM\/00RETB5PURPLE","price":55.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_Retrofit_Brush_1.png?v=1792748153"},{"product_id":"passive-purple-retrofit-airtightness-10kg","title":"Passive Purple Retrofit - Retrofit Airtightness Spray\/Roller Paint (10kg)","description":"\u003ch2\u003ePassive Purple Retrofit – Breathable Airtightness for Existing Buildings\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple Retrofit\u003c\/strong\u003e is a liquid-applied airtight membrane for older and solid-wall buildings that need to breathe. Sprayed or rolled on internally, it seals walls, ceilings and junctions against draughts and air leakage while staying \u003cstrong\u003evapour open (Sd ≈ 0.6 m)\u003c\/strong\u003e, so moisture in the wall can still dry out.\u003c\/p\u003e\n\u003ch2\u003eWhy Do Older Buildings Need a Breathable Airtight Layer?\u003c\/h2\u003e\n\u003cp\u003eSolid brick, stone and lime-plastered walls were built to manage moisture by letting it move through the wall and dry out. Sealing them with a vapour-tight layer can trap that moisture in the fabric, leading to damp, mould and decay.\u003c\/p\u003e\n\u003cp\u003ePassive Purple Retrofit stops the air leaks that cause heat loss and draughts, but still lets water vapour pass through – so the wall keeps working the way it was designed to.\u003c\/p\u003e\n\u003ch2\u003ePassive Purple or Passive Purple Retrofit?\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 16px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"background: #4a1a6e; color: #fff; padding: 10px 12px; text-align: left;\"\u003e\u003c\/th\u003e\n\u003cth style=\"background: #4a1a6e; color: #fff; padding: 10px 12px; text-align: left;\"\u003ePassive Purple\u003c\/th\u003e\n\u003cth style=\"background: #4a1a6e; color: #fff; padding: 10px 12px; text-align: left;\"\u003ePassive Purple Retrofit\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003e\u003cstrong\u003eVapour behaviour\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003eVapour control\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003eVapour open (breathable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003eNew builds and insulated build-ups – applied on the warm side of the insulation\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003eOlder, solid-wall and breathable buildings where moisture must be able to dry out\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003e\u003cstrong\u003eAirtight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px; border-bottom: 1px solid #e0d3ef;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eNot sure which you need? Our \u003ca href=\"\/en-la\/pages\/condensation-risk-analysis\" title=\"Condensation Risk Analysis UK\"\u003econdensation risk analysis\u003c\/a\u003e will tell you, or see \u003ca href=\"\/en-la\/products\/passive-purple-internal-airtight-vapour-control-paint-11-4kg\" title=\"Passive Purple vapour control paint\"\u003ePassive Purple\u003c\/a\u003e for vapour control.\u003c\/p\u003e\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirtight \u0026amp; smoke-tight:\u003c\/strong\u003e stops draughts and uncontrolled air leakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable:\u003c\/strong\u003e vapour open (Sd ≈ 0.6 m) so walls can keep drying out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging:\u003c\/strong\u003e stays sealed as older buildings move.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-fungus:\u003c\/strong\u003e resists mould growth on the coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow emission:\u003c\/strong\u003e EMICODE EC2 rated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-rated:\u003c\/strong\u003e Euroclass B-s1,d0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless:\u003c\/strong\u003e no tapes, laps or weak points – seals around pipes, cables and joists.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpray or roller:\u003c\/strong\u003e fast, even coverage on large walls and ceilings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhere to Use It\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSolid brick and stone walls\u003c\/li\u003e\n\u003cli\u003eLime-plastered walls\u003c\/li\u003e\n\u003cli\u003ePeriod and traditional homes\u003c\/li\u003e\n\u003cli\u003eCeilings, junctions and service penetrations\u003c\/li\u003e\n\u003cli\u003eTimber-frame and mixed-construction retrofits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor joints, gaps and detailing, use \u003ca href=\"\/en-la\/products\/passive-purple-retrofit-airtightness-5kg\" title=\"Passive Purple Retrofit Brush\"\u003ePassive Purple Retrofit Brush\u003c\/a\u003e, a fibre-reinforced brush grade.\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\u003ePassive Purple Retrofit is a product of Passive Purple External. The test results and certificates below are issued for Passive Purple External, not for the Passive Purple Retrofit product name:\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 \/ vapour-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 · 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-la\/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\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/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\u003cli\u003e\u003ca href=\"\/en-la\/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\u003cli\u003e\u003ca href=\"\/en-la\/blogs\/news\/enerphit-explained-the-passivhaus-standard-for-old-buildings\" title=\"EnerPHit Explained – The Passivhaus Standard for Old Buildings\"\u003eEnerPHit Explained – The Passivhaus Standard for Old Buildings\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-la\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-07)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52682698490196,"sku":"IM\/00RETS10PURPLE","price":119.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_Retrofit_1.png?v=1792748141"},{"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 vapour 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-la\/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 vapour 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 vapour 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 vapour control layer. Where your design needs one, use \u003ca href=\"\/en-la\/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-la\/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 blockwork\u003c\/li\u003e\n\u003cli\u003eOSB and engineered timber panels\u003c\/li\u003e\n\u003cli\u003eFibre cement boards and plasterboard\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-la\/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 vapour 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 vapour 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 plasterboard\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\u003eBlockwork 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-la\/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-la\/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-la\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapour Control for High-Rise Re-Cladding\"\u003eAirtight and Vapour Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/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-la\/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-la\/blogs\/educational\/airtightness-tape-guide\"\u003eairtightness tape guide\u003c\/a\u003e covers width and substrate selection, while \u003ca href=\"\/en-la\/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; Vapour 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 mould 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 realkalisation, 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 vapour 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 \/ vapour-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-la\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · Read about \u003ca href=\"\/en-la\/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-la\/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-la\/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-la\/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-la\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapour Control for High-Rise Re-Cladding\"\u003eAirtight and Vapour Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/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-la\/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-la\/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\/new_tub_fred.png?v=1793269420","url":"https:\/\/intelligentmembranes.com\/en-la\/collections\/intumescent-paints.oembed","provider":"Intelligent Membranes","version":"1.0","type":"link"}