{"title":"Weatherproof Membrane","description":"\u003cp\u003eWeatherproofing that goes on wet and stays put. \u003ca href=\"\/en-us\/products\/facade-waterproofing-membrane-5kg\"\u003ePassive Purple External\u003c\/a\u003e is our airtight, fire rated (Class B) façade waterproofing membrane, sprayed, rollered or brushed over sheathing boards and masonry to keep the weather out while the build catches up. \u003ca href=\"\/en-us\/products\/passivhaus-weatherproof-masonry-protection-brick-sealer-cream\"\u003ePassivhaus Brickseal\u003c\/a\u003e protects finished masonry as a weatherproof damp proofing paint, and Passive Purple X (also Class B) covers the internal-to-external details. Available in purple, white, black and cream — one continuous coat, no laps, nothing flapping in the wind.\u003c\/p\u003e","products":[{"product_id":"facade-waterproofing-membrane-5kg","title":"Passive Purple External Airtight Fire Rated Façade Waterproofing Membrane (5kg) - Purple Brush","description":"\u003cp\u003e\u003cspan data-teams=\"true\"\u003ePassive Purple External Brush, specifically designed to seal joints and gaps with precision and durability. This advanced liquid-applied weather barrier is perfect for external applications where airtightness and weather protection are critical. The brush version contains specialized fibers, allowing it to span larger gaps and joints, delivering exceptional coverage and performance in challenging areas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified - fire-rated, watertight \u0026amp; breathable\u003c\/h2\u003e\n\u003cp\u003eIndependently certified to both European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire Euroclass B-s1,d0\u003c\/strong\u003e (EN 13501-1, on A1 substrates ≥653 kg\/m³) \u0026amp; \u003cstrong\u003eASTM E84 Class A\u003c\/strong\u003e (Flame Spread 0 \/ Smoke 15)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight Class W1\u003c\/strong\u003e (EN 13859-2) \u0026amp; water permeability Class W3 (EN 1062-3); near-zero water absorption (EN 16302)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable \/ vapor-open\u003c\/strong\u003e - Sd ≈ 0.6 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging\u003c\/strong\u003e A3 (23°C) \/ A4 (-10°C) (EN 1062-7) \u0026amp; CO₂ \/ carbonation barrier Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV-stable\u003c\/strong\u003e (strength increases after 500 h UV) · low-emission \u003cstrong\u003eEMICODE EC2\u003c\/strong\u003e · anti-fungus (rating 0)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKiwa BDA Agrément\u003c\/strong\u003e (BAW-21-214-P-A-UK) · Passive House component (phB) · US ICC-ES AC212 water-resistive barrier\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · read about \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\"\u003ePassive Purple External\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/damp-walls-two-breathable-solutions-that-actually-work\" title=\"Damp Walls? Two Breathable Solutions That Actually Work\"\u003eDamp Walls? Two Breathable Solutions That Actually Work\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-05)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52682707665236,"sku":"IM\/00PPEB5","price":55.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_External_Brush.png?v=1792744807"},{"product_id":"brush-applied-facade-waterproofing-membrane-5kg-bundle","title":"Passive Purple External Brush Pack","description":"\u003cspan lang=\"EN-GB\"\u003eExcelling characteristics of passive purple external: \u003c\/span\u003e\r\n\u003cul type=\"disc\"\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eFireclass B\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eRaintight but vapor breathable\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAirtight\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eUV resistant\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAnti fungus\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eSelfcleaning \/ reduced dirt pickup caused by UV netting\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCrackbridging\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCarbonatation block (for concrete); realkalizing (concrete)\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eProtection against salts (for roads) (concrete structures).\u003c\/span\u003e\u003c\/li\u003e\r\n \t\u003cli\u003eCan also be used a as a protective coating on concrete as antiacrbonatation on concrete \/ cementcoating.\u003c\/li\u003e\r\n \t\u003cli\u003e1kg will cover 1m2\u003c\/li\u003e\r\n\u003c\/ul\u003e\n\u003cdiv style=\"border-top:2px solid #b5985a;margin-top:28px;padding-top:18px;\"\u003e\n\u003ch2 style=\"color:#4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Intelligent Membranes","offers":[{"title":"Default Title","offer_id":52608802062676,"sku":"IM\/00PPEBRB","price":64.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/passive_purple_external_brush_pack.png?v=1793205418"},{"product_id":"passive-purple-x-fire-class-b-airtight-paint-5kg","title":"Passive Purple X (5kg) Brush Applied","description":"\u003cp\u003e\u003cspan lang=\"EN-GB\"\u003eKey characteristics of Passive Purple X (shares Passive Purple External's certified performance): \u003c\/span\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eRaintight but vapor breathable\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAirtight\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eUV resistant\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eAnti fungus\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eSelfcleaning \/ reduced dirt pickup caused by UV netting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCrackbridging\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eCarbonatation block (for concrete); realkalizing (concrete)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN-GB\"\u003eProtection against salts (for roads) (concrete structures).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eCan also be used as a protective coating on concrete as anti-carbonization 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 \u0026amp; Certified — fire-rated, watertight \u0026amp; breathable\u003c\/h2\u003e\n\u003cp\u003ePassive Purple X shares the certified Passive Purple External performance, independently verified to both European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e🔥 \u003cstrong\u003eReaction to fire Euroclass B-s1,d0\u003c\/strong\u003e (EN 13501-1, on A1 substrates ≥653 kg\/m³) \u0026amp; \u003cstrong\u003eASTM E84 Class A\u003c\/strong\u003e (Flame Spread 0 \/ Smoke 15)\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eWatertight Class W1\u003c\/strong\u003e (EN 13859-2) \u0026amp; water permeability Class W3 (EN 1062-3)\u003c\/li\u003e\n\u003cli\u003e🌬️ \u003cstrong\u003eBreathable \/ vapor-open\u003c\/strong\u003e — Sd ≈ 0.6 m (EN ISO 12572)\u003c\/li\u003e\n\u003cli\u003e🧱 \u003cstrong\u003eCrack-bridging\u003c\/strong\u003e A3 (23°C) \/ A4 (-10°C) (EN 1062-7) \u0026amp; CO₂ \/ carbonation barrier Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e🇬🇧 \u003cstrong\u003eKiwa BDA Agrément\u003c\/strong\u003e (BAW-21-214-P-A-UK) · Passive House component (phB) · US ICC-ES AC212\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\"\u003ePassive Purple External explained\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/the-airtightness-challenge-facing-modern-construction-why-blockwork-alone-is-no-longer-enough\" title=\"The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\"\u003eThe Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/how-to-retrofit-vapour-control-without-the-mess-bba-approved-passivhaus-certified-building-control-ready\" title=\"How to Retrofit Vapor Control Without the Mess\"\u003eHow to Retrofit Vapor Control Without the Mess\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-06)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52682702258516,"sku":"IM\/00PPXB5PURPLE","price":55.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_External_Brush_2.png?v=1792672914"},{"product_id":"passivhaus-weatherproof-masonry-protection-brick-sealer-cream","title":"Passivhaus Brickseal - Spray \/ Roller \/ Brush applied Weatherproof Masonry Damp Proof Paint","description":"\u003ch2\u003ePassivhaus Brick Seal - Masonry Protection Cream | Breathable Brick \u0026amp; Stone Water Repellent\u003c\/h2\u003e\n\u003cp\u003ePassivhaus Brick Seal is a deeply penetrating masonry protection cream that waterproofs brick, stone, mortar, block and concrete without changing their appearance. A single coat by brush, roller or spray forms an invisible, breathable water-repellent barrier that lines the pores of the masonry rather than blocking them, keeping walls dry while allowing trapped moisture to escape naturally.\u003c\/p\u003e\n\u003ch2\u003eStops Rain Penetration. Saves Energy. Protects Your Masonry.\u003c\/h2\u003e\n\u003cp\u003eWet masonry loses thermal resistance fast. By keeping walls dry all year round, Brick Seal maximises the insulating performance of your external walls, reducing heat loss and cutting energy bills. Ideal for solid wall construction, cavity wall insulation protection, and retrofit energy improvement projects.\u003c\/p\u003e\n\u003ch2\u003eWhere to Use Passivhaus Brick Seal\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrick and brickwork protection\u003c\/li\u003e\n\u003cli\u003eStone and sandstone sealing\u003c\/li\u003e\n\u003cli\u003eMortar and render waterproofing\u003c\/li\u003e\n\u003cli\u003eConcrete and block wall protection\u003c\/li\u003e\n\u003cli\u003eCavity wall insulation protection, preventing damp reaching insulation\u003c\/li\u003e\n\u003cli\u003eFlood resilience, reducing water absorption through masonry\u003c\/li\u003e\n\u003cli\u003eListed buildings and heritage masonry, invisible natural finish retained\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeeply penetrating, bonds within the pores not on the surface\u003c\/li\u003e\n\u003cli\u003eBreathable, lets walls breathe and release moisture\u003c\/li\u003e\n\u003cli\u003eInvisible finish, no change to the appearance of brickwork or stonework\u003c\/li\u003e\n\u003cli\u003eSingle coat application by brush, roller or spray\u003c\/li\u003e\n\u003cli\u003ePassivhaus certified, the highest performance standard in building fabric protection\u003c\/li\u003e\n\u003cli\u003eSuitable for brick, stone, mortar, render, block and concrete\u003c\/li\u003e\n\u003cli\u003eSolvent-free, water-based formula\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePassivhaus Certified Masonry Protection\u003c\/h2\u003e\n\u003cp\u003eUnlike standard brick sealers and waterproof masonry paints, Passivhaus Brick Seal carries Passivhaus certification, the most rigorous independent performance standard in construction. That means independently verified breathability, water resistance and long-term durability you can specify with confidence.\u003c\/p\u003e\n\u003ch2\u003eHow to Apply Brick Seal\u003c\/h2\u003e\n\u003cp\u003eApply to clean, dry masonry by brush, roller or airless spray in a single coat. The cream penetrates the surface and cures to form a colourless water-repellent zone. Most surfaces are protected within 24 hours.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"4.5kg","offer_id":52608805405012,"sku":"IM\/00PHBS4.5","price":89.99,"currency_code":"GBP","in_stock":true},{"title":"3.1kg","offer_id":52608805437780,"sku":"IM\/00PHBS3.1","price":65.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passivhaus_Brick_Seal_4.5KG.png?v=1792502252"},{"product_id":"passive-purple-x-10kg-white-spray-roller","title":"Passive Purple X (10kg) - Spray\/Roller","description":"\u003ch2\u003eWhat is Passive Purple X and How Does it Work?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple X\u003c\/strong\u003e is a \u003cstrong\u003efire-rated, airtight, watertight and breathable liquid membrane\u003c\/strong\u003e for new-build projects. It is \u003cstrong\u003espray or roller-applied\u003c\/strong\u003e to form one seamless coating, replacing the separate layers and laps of a traditional membrane.\u003c\/p\u003e\n\u003cp\u003eApplied \u003cstrong\u003einternally or externally\u003c\/strong\u003e, it stops air and rain getting through while allowing water vapor to escape, so the building fabric can dry out. It's available in \u003cstrong\u003ewhite, cream, black or purple\u003c\/strong\u003e and shares the certified performance of \u003ca href=\"\/en-us\/products\/passive-purple-external-airtight-fire-rated-facade-waterproofing-membrane-10kg-cream-spray-roller\" title=\"Passive Purple External\"\u003ePassive Purple External\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhy Breathable Airtight Paint?\u003c\/h2\u003e\n\u003cp\u003eTrapped moisture can damage the building fabric, so a wall needs to keep out air and rain while still being able to dry. Using separate products for fire, water, air and vapor also creates more interfaces where a detail can fail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple X brings those functions together in one continuous layer.\u003c\/strong\u003e With a vapor resistance of \u003cstrong\u003eSd ≈ 0.6 m\u003c\/strong\u003e, it lets moisture escape while the coating sheds rain.\u003c\/p\u003e\n\u003cp\u003eIt isn't a vapor control layer. Where your design needs one, use \u003ca href=\"\/en-us\/products\/passive-purple-internal-airtight-vapour-control-paint-11-4kg\" title=\"Passive Purple\"\u003ePassive Purple\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eSpray \/ Roller or Brush Application\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpray application:\u003c\/strong\u003e Using an airless machine, one installer can cover up to \u003cstrong\u003e300 m² per day\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoller application:\u003c\/strong\u003e Ideal if you don't have a spray machine to hand.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-us\/products\/passive-purple-x-fire-class-b-airtight-paint-5kg\" title=\"Passive Purple X Brush\"\u003e\u003cstrong\u003eBrush application (Passive Purple X Brush):\u003c\/strong\u003e\u003c\/a\u003e A 5kg brush-applied version.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSuitability of Passive Purple X\u003c\/h2\u003e\n\u003cp\u003ePassive Purple X is designed primarily for \u003cstrong\u003enew builds\u003c\/strong\u003e, for internal and external use, and can be applied to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConcrete, brick and concrete block (CMU)\u003c\/li\u003e\n\u003cli\u003eOSB and engineered timber panels\u003c\/li\u003e\n\u003cli\u003eFiber cement boards and drywall (gypsum board)\u003c\/li\u003e\n\u003cli\u003eInsulation panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWorking on an existing building?\u003c\/strong\u003e Take a look at \u003ca href=\"\/en-us\/products\/passive-purple-retrofit-airtightness-10kg\" title=\"Passive Purple Retrofit\"\u003ePassive Purple Retrofit\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFire rating:\u003c\/strong\u003e The Euroclass B-s1,d0 classification applies on A1 substrates with a density of at least 653 kg\/m³. The designer and building control body should confirm suitability against the building's fire strategy.\u003c\/p\u003e\n\u003ch2\u003eThe Benefits of Passive Purple X\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eFire rated:\u003c\/strong\u003e Euroclass B-s1,d0 on qualifying substrates and ASTM E84 Class A\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eAirtight and smoke-tight:\u003c\/strong\u003e One continuous, seamless layer\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWatertight but breathable:\u003c\/strong\u003e Keeps rain out and lets vapor escape\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCrack-bridging:\u003c\/strong\u003e Tested at 23°C and -10°C\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eUV-stable:\u003c\/strong\u003e Tensile strength increases after 500 hours of UV exposure\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eProtects concrete:\u003c\/strong\u003e Class C1 CO₂ and carbonation barrier\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWater-based and low emission:\u003c\/strong\u003e EMICODE EC2 rated\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAirtightness and Breathability, Explained\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is airtightness?\u003c\/strong\u003e Controlling unintended air leakage through the building fabric.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat does breathable mean?\u003c\/strong\u003e Water vapor can pass through the membrane, while liquid water and air can't.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat are the airtightness standards?\u003c\/strong\u003e New homes in England must achieve 8 m³\/(h·m²) at 50 Pa or better, while Passivhaus requires ≤0.6 ACH.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy does it matter?\u003c\/strong\u003e Good airtightness reduces energy loss and improves comfort, while breathability allows the building fabric to dry.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePassive Purple X and Passivhaus\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is Passivhaus?\u003c\/strong\u003e A building standard focused on extreme energy efficiency and occupant comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat are the five principles?\u003c\/strong\u003e Airtightness, insulation, high-performance glazing, thermal bridge-free design, and ventilation with heat recovery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the certification?\u003c\/strong\u003e Passive Purple X shares Passive Purple External's Passive House Institute component certification, \u003cstrong\u003eClass phB\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePreparation \u0026amp; Application\u003c\/h2\u003e\n\u003cp\u003eGreat airtightness starts with the right prep:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRemove salt efflorescence, dust, loose material and standing water. Damp surfaces are fine.\u003c\/li\u003e\n\u003cli\u003eMake sure the surface is closed, filling holes and joints with a fast-setting cement-based product or polyurethane foam.\u003c\/li\u003e\n\u003cli\u003eDon't add water or solvents.\u003c\/li\u003e\n\u003cli\u003eDon't apply below 5°C (air and substrate temperature), in full sunlight or during rain.\u003c\/li\u003e\n\u003cli\u003eApply two coats, letting the first dry before applying the second.\u003c\/li\u003e\n\u003cli\u003eClean tools with water after use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow Much Will You Need?\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSubstrate\u003c\/th\u003e\n\u003cth\u003eApprox. coverage\u003c\/th\u003e\n\u003cth\u003ePer 10kg tub\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOSB and drywall\u003c\/td\u003e\n\u003ctd\u003e0.8–1.0 kg\/m²\u003c\/td\u003e\n\u003ctd\u003e10–12 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConcrete block and brickwork\u003c\/td\u003e\n\u003ctd\u003e1.0–1.2 kg\/m²\u003c\/td\u003e\n\u003ctd\u003e8–10 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eCoverage varies with substrate type, porosity and surface condition. Use a wet film gauge to check thickness during application.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified\u003c\/h2\u003e\n\u003cp\u003ePassive Purple X shares the certified performance of Passive Purple External, independently verified 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\u003eKiwa BDA Agrément:\u003c\/strong\u003e BAW-21-214-P-A-UK, with assessed durability of around 60 years\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive House component:\u003c\/strong\u003e Class phB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUS water-resistive barrier:\u003c\/strong\u003e ICC-ES AC212\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\" title=\"Passive Purple External: Fire Class B, Watertight and Breathable\"\u003ePassive Purple External: Fire Class B, Watertight and Breathable\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/the-airtightness-challenge-facing-modern-construction-why-blockwork-alone-is-no-longer-enough\" title=\"The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\"\u003eThe Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-06)\u003c\/a\u003e for this product.\u003c\/p\u003e\n\u003ch2\u003eConnect the Membrane at Windows and Junctions\u003c\/h2\u003e\n\u003cp\u003ePlan the adjoining tape detail as well as the coated area. Our \u003ca href=\"\/en-us\/blogs\/educational\/airtightness-tape-guide\"\u003eairtightness tape guide\u003c\/a\u003e covers width and substrate selection, while \u003ca href=\"\/en-us\/blogs\/educational\/airtightness-tape-vs-liquid-airtight-membrane\"\u003etape versus liquid membrane\u003c\/a\u003e explains compatible interfaces, preparation and inspection. Use the specified coating-to-tape detail and check continuity before covering.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"White","offer_id":52683125358932,"sku":"IM\/00PPXS10WHITE","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Cream","offer_id":52683125260628,"sku":"IM\/00PPXS10CREAM","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":52683125293396,"sku":"IM\/00PPXS10BLACK","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Purple","offer_id":52683125326164,"sku":"IM\/00PPXS10PURPLE","price":119.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_X_3.png?v=1792672329"},{"product_id":"passive-purple-external-airtight-fire-rated-facade-waterproofing-membrane-10kg-cream-spray-roller","title":"Passive Purple External Airtight Fire Rated Façade Waterproofing Membrane (10kg) - Spray \/ Roller","description":"\u003ch3\u003eKey Characteristics of Passive Purple External\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePassive Purple External\u003c\/strong\u003e is a \u003cstrong\u003eFire Class B (Euroclass B-s1,d0) liquid-applied airtight paint\u003c\/strong\u003e for both \u003cstrong\u003einternal and external applications\u003c\/strong\u003e. It combines airtightness, weather protection, and intelligent moisture management in a single certified solution.\u003c\/p\u003e\n\u003ch4\u003eKey Benefits \u0026amp; Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire Class B\u003c\/strong\u003e – exceptional fire resistance, setting it apart from standard membranes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRaintight \u0026amp; Vapor Breathable\u003c\/strong\u003e – keeps water out while allowing moisture to escape, ensuring a healthy building fabric.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirtight \u0026amp; Smoke-Tight\u003c\/strong\u003e – delivers a complete barrier to uncontrolled air leakage and smoke movement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV Resistant \u0026amp; Self-Cleaning\u003c\/strong\u003e – long-term durability with reduced dirt pickup and surface staining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Fungus Protection\u003c\/strong\u003e – prevents mold growth and safeguards indoor air quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-Bridging\u003c\/strong\u003e – maintains airtightness even where movement or minor cracks occur.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcrete Protection\u003c\/strong\u003e – blocks carbonation, provides realkalization, and shields against salts from roads and de-icing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Purpose\u003c\/strong\u003e – suitable for \u003cstrong\u003einternal and external\u003c\/strong\u003e applications across retrofit and new-build projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntelligent Moisture Management\u003c\/strong\u003e – allows the substrate to breathe, balancing vapor openness with airtight performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith \u003cstrong\u003ePassive Purple External\u003c\/strong\u003e, you get \u003cstrong\u003eairtightness, weather resistance, and long-term structural protection\u003c\/strong\u003e in one advanced, certified liquid membrane, ideal for timber frame, retrofit, and high-performance construction projects.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified - fire-rated, watertight \u0026amp; breathable\u003c\/h2\u003e\n\u003cp\u003eIndependently certified to both European (EN) and US (ASTM) standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire Euroclass B-s1,d0\u003c\/strong\u003e (EN 13501-1, on A1 substrates ≥653 kg\/m³) \u0026amp; \u003cstrong\u003eASTM E84 Class A\u003c\/strong\u003e (Flame Spread 0 \/ Smoke 15)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight Class W1\u003c\/strong\u003e (EN 13859-2) \u0026amp; water permeability Class W3 (EN 1062-3); near-zero water absorption (EN 16302)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable \/ vapor-open\u003c\/strong\u003e - Sd ≈ 0.6 m (EN ISO 12572), so the wall dries outward\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrack-bridging\u003c\/strong\u003e A3 (23°C) \/ A4 (-10°C) (EN 1062-7) \u0026amp; CO₂ \/ carbonation barrier Class C1 (EN 1062-6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV-stable\u003c\/strong\u003e (strength increases after 500 h UV) · low-emission \u003cstrong\u003eEMICODE EC2\u003c\/strong\u003e · anti-fungus (rating 0)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKiwa BDA Agrément\u003c\/strong\u003e (BAW-21-214-P-A-UK) · Passive House component (phB) · US ICC-ES AC212 water-resistive barrier\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/en-us\/pages\/passive-purple-tested-certified\" title=\"Tested \u0026amp; Certified\"\u003eSee all test data \u0026amp; certifications →\u003c\/a\u003e · Read about \u003ca href=\"\/en-us\/blogs\/educational\/passive-purple-external-fire-class-b-watertight-breathable\"\u003ePassive Purple External\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003e🌎 Tested for World Markets - ASTM (US) \u0026amp; EN (Europe)\u003c\/h2\u003e\n\u003cp\u003ePassive Purple External is fire-rated to \u003cstrong\u003eASTM E84 Class A (US)\u003c\/strong\u003e and \u003cstrong\u003eEN fire Class B (Europe)\u003c\/strong\u003e - tested to US ASTM standards alongside its European certifications so that the same fire-rated façade membrane can be specified on both sides of the Atlantic.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUS architects \u0026amp; specifiers: \u003ca href=\"\/en-us\/pages\/us-specifications\" title=\"US specifications in CSI MasterFormat\"\u003edownload the US specifications (CSI MasterFormat)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eUS supply \u0026amp; install: \u003ca href=\"\/en-us\/pages\/chicago\" title=\"Passive Purple Chicago — distributed and installed by WickRight\"\u003eWickRight, our Chicago distribution \u0026amp; installation partner\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eFire-rated range: \u003ca href=\"\/en-us\/collections\/fire-protection\" title=\"Fire protection collection\"\u003eshop the full fire protection collection\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/airtight-and-vapour-control-for-high-rise-re-cladding-installed-from-the-outside-i\" title=\"Airtight and Vapor Control for High-Rise Re-Cladding\"\u003eAirtight and Vapor Control for High-Rise Re-Cladding\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/educational\/what-is-airtightness-and-why-it-matters-for-net-zero-buildings\" title=\"What is Airtightness (and Why It Matters for Net Zero Buildings)\"\u003eWhat is Airtightness (and Why It Matters for Net Zero Buildings)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-us\/blogs\/news\/damp-walls-two-breathable-solutions-that-actually-work\" title=\"Damp Walls? Two Breathable Solutions That Actually Work\"\u003eDamp Walls? Two Breathable Solutions That Actually Work\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eQuality assurance:\u003c\/strong\u003e \u003ca href=\"\/en-us\/pages\/qa-sign-off-downloads\"\u003eDownload the free Installation \u0026amp; QA Record sign-off sheet (IM-QA-05)\u003c\/a\u003e for this product.\u003c\/p\u003e","brand":"Intelligent Membranes","offers":[{"title":"Purple","offer_id":52683132174676,"sku":"IM\/00PPE10PURPLE","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":52683132141908,"sku":"IM\/00PPE10BLACK","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"Cream","offer_id":52683132207444,"sku":"IM\/00PPE10CREAM","price":119.99,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":52683132240212,"sku":"IM\/00PPE10WHITE","price":119.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_External_df111b0c-cf87-4d71-b782-77c1ea4093dd.png?v=1792499042"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/collections\/3.png?v=1793269448","url":"https:\/\/intelligentmembranes.com\/en-us\/collections\/weatherproof-membrane.oembed","provider":"Intelligent Membranes","version":"1.0","type":"link"}