{"title":"Radon Barrier Membranes","description":"\u003cp\u003eLiquid-applied radon protection you can actually see going on. \u003ca href=\"\/en-us\/products\/passive-purple-internal-airtight-vapour-control-paint-11-4kg\"\u003ePassive Purple\u003c\/a\u003e and \u003ca href=\"\/en-us\/products\/airtight-white-membrane-paint\"\u003eAirtight White\u003c\/a\u003e are tested radon and methane barriers, sprayed, rollered or brushed on to form one continuous membrane over floors, walls and junctions — well suited to retrofit, where lifting floors isn't an option. Both are Passivhaus certified and BBA approved, so the same coat that blocks ground gases also delivers your airtightness. Pair with Waterproof Blue liquid DPM and Passivhaus Airtight Sealant to complete the detail.\u003c\/p\u003e","products":[{"product_id":"airtight-white-membrane-paint","title":"Airtight White - Vapour Control, Airtight \u0026 Smoke Tight Paint (11.4kg) - Spray \/ Roller Applied","description":"\u003ch2 data-start=\"93\" data-end=\"127\"\u003ePassive Purple Airtight White\u003c\/h2\u003e\n\u003cp data-start=\"128\" data-end=\"180\"\u003e\u003cstrong data-start=\"128\" data-end=\"180\"\u003eVOC-Free Airtight, Vapour \u0026amp; Gas Control Membrane\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"182\" data-end=\"389\"\u003ePassive Purple Airtight White is a \u003cstrong data-start=\"217\" data-end=\"260\"\u003eVOC-free, water-based airtight membrane\u003c\/strong\u003e providing reliable \u003cstrong data-start=\"280\" data-end=\"298\"\u003evapour control\u003c\/strong\u003e and protection against \u003cstrong data-start=\"322\" data-end=\"349\"\u003eradon and methane gases, \u003c\/strong\u003ewithout any nasty chemicals or fumes.\u003c\/p\u003e\n\u003cp data-start=\"391\" data-end=\"687\"\u003eIdeal for those on-site “oops” moments, it can be applied directly onto \u003cstrong data-start=\"463\" data-end=\"479\"\u003eplasterboard\u003c\/strong\u003e if a vapour control layer has been missed. When used with \u003cstrong data-start=\"538\" data-end=\"551\"\u003eIM Primer\u003c\/strong\u003e, it can be \u003cstrong data-start=\"563\" data-end=\"595\"\u003eleft on show or painted over\u003c\/strong\u003e, making it perfect for exposed environments such as \u003cstrong data-start=\"648\" data-end=\"686\"\u003ecar parks, museums, and stairwells\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"689\" data-end=\"910\"\u003eOnce dry, it forms a \u003cstrong data-start=\"710\" data-end=\"749\"\u003etough yet flexible polymer membrane\u003c\/strong\u003e that moves with the building and resists impact damage, eliminating the rips, tears, staple holes and failed tapes associated with traditional paper membranes.\u003c\/p\u003e\n\u003cp data-start=\"912\" data-end=\"954\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eLess labour. Less waste. More performance.\u003c\/p\u003e\n\u003cp data-start=\"912\" data-end=\"954\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eCheck out our \u003ca href=\"https:\/\/intelligentmembranes.aflip.in\/80f3ef4f93.html\" title=\"Retrofit Vapour control\" rel=\"noopener\" target=\"_blank\"\u003ecase study \u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eLeft on show - see it in 360°\u003c\/h2\u003e\n\u003cp\u003eA museum project where Airtight White is doing both jobs at once: the airtightness and vapour control layer on the concrete panel walls, and the finished surface that stays on view.\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\/LnD57?logo=1\u0026amp;info=1\u0026amp;fs=1\u0026amp;vr=0\u0026amp;zoom=1\u0026amp;sd=1\u0026amp;thumbs=1\" title=\"Airtight White left on show as the finished surface, museum project — 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;\"\u003eTested \u0026amp; Certified - worldwide\u003c\/h2\u003e\n\u003cp\u003eAirtight White is the white-pigmented version of Passive Purple - the same liquid airtight membrane formulation, independently tested to \u003cstrong\u003eboth ASTM (ICC-ES) and EN standards\u003c\/strong\u003e, so it can be specified 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 vapour control, Sd ~0.8–40 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh solar reflectance\u003c\/strong\u003e - the white finish reflects even more solar energy (the purple grade is independently rated SRI 52, 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 mould 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\u003eICC-ES ESR-4715\u003c\/strong\u003e, Passivhaus certified \u0026amp; BBA approved\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Passive Purple \u0026amp; Airtight White 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\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003ePassive Purple \u0026amp; Airtight White: Tested \u0026amp; Certified (ASTM \u0026amp; EN data)\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\"\u003eThe French A+ indoor-air rating explained\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\/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\/case-study\/reuben-college-oxford-award-winning-airtight-basement-solution-using-airtight-white\" title=\"Reuben College, Oxford\"\u003eReuben College, Oxford – Award-Winning Airtight Basement with Airtight White\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-03)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608799965524,"sku":"IM\/00ATW11.4","price":99.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Airtight_White_2.png?v=1792499467"},{"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\u003eBBA Certified \u0026amp; Passivhaus Certified\u003c\/strong\u003e – guaranteed airtightness and durability you can trust\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\u003eExceptional Airtightness\u003c\/strong\u003e – achieves \u003cstrong\u003e0.03 ACH\u003c\/strong\u003e, far beyond the Passivhaus requirement of 0.6 ACH\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, certified 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;\"\u003eTested \u0026amp; Certified - worldwide\u003c\/h2\u003e\n\u003cp\u003eAirtight White Brush is the white-pigmented Passive Purple formulation - independently verified to \u003cstrong\u003eboth ASTM (ICC-ES) 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 · ICC-ES ESR-4715)\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\u003eICC-ES ESR-4715\u003c\/strong\u003e, Passivhaus certified \u0026amp; BBA approved\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":"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 verified to \u003cstrong\u003eboth ASTM (ICC-ES) 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\u003eICC-ES ESR-4715\u003c\/strong\u003e, Passivhaus certified \u0026amp; BBA approved\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 (ICC-ES, 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\u003ePassivhaus-certified airtightness\u003c\/strong\u003e as the 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 and ICC-ES evaluation (ESR-4715) 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\u003eICC-ES ESR-4715\u003c\/strong\u003e, Passivhaus certified \u0026amp; BBA approved\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":"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 Airsealing:\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;\"\u003eTested \u0026amp; Certified — worldwide\u003c\/h2\u003e\n\u003cp\u003ePassive Purple in sealant tubes is the same Passive Purple liquid airtight membrane formulation — independently verified to \u003cstrong\u003eboth ASTM (ICC-ES) 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 · ICC-ES ESR-4715)\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\u003eICC-ES ESR-4715\u003c\/strong\u003e, Passivhaus certified \u0026amp; BBA approved\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":"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"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/collections\/new_tub_pp_internal_a6b309c6-ffa2-47ed-9883-8f66b6eb4c45.png?v=1793269437","url":"https:\/\/intelligentmembranes.com\/en-us\/collections\/radon-barrier-membranes.oembed","provider":"Intelligent Membranes","version":"1.0","type":"link"}