{"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\u003efibre-reinforced, liquid-applied airtight membrane\u003c\/strong\u003e designed for detailed airtightness work. Applied with a simple paintbrush, it creates a \u003cstrong\u003epermanent, seamless vapour-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 snagging\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 fibres\u003c\/strong\u003e that span and seal larger cracks and irregularities. This makes it the go-to airtight paint for precision work, detailing, and repairs, while still delivering the same \u003cstrong\u003eairtightness performance\u003c\/strong\u003e as the Passivhaus-certified main system.\u003c\/p\u003e\n\u003ch3\u003eSurface preparation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure surfaces are \u003cstrong\u003esolid, dust-free, and closed\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge gaps (\u0026gt; 5 mm):\u003c\/strong\u003e Fill with cement-based filler or foam before application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall to medium gaps (2–5mm):\u003c\/strong\u003e Passive Purple Brush can be applied directly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplication \u0026amp; coverage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApplied with a \u003cstrong\u003eflat paintbrush\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eEasy to use for small projects and detailed work.\u003c\/li\u003e\n\u003cli\u003eOnce cured, it can be \u003cstrong\u003epainted, plastered, or rendered over\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy airtightness matters\u003c\/h3\u003e\n\u003cp\u003eAir leakage through cracks and junctions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReduces energy efficiency\u003c\/li\u003e\n\u003cli\u003eAllows draughts, damp, and mould\u003c\/li\u003e\n\u003cli\u003eCan compromise Passivhaus and building regulations compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBy sealing with Passive Purple Brush, you ensure every junction is airtight, securing energy performance and long-term building health.\u003c\/p\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eTested \u0026amp; Certified\u003c\/h2\u003e\n\u003cp\u003ePassive Purple Brush is covered by the same independent testing as the Passive Purple system:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrench A+ indoor-air rating \u0026amp; Finnish M1 class\u003c\/strong\u003e - very low VOC emissions (EN 16516 \/ RTS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive House Institute Class A airtight\u003c\/strong\u003e - 0.02 m³\/h·m² @ 50 Pa (EN 12114)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir barrier material\u003c\/strong\u003e - air leakage 0.02 L\/s·m² at 75 Pa (ASTM E2178)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaction to fire\u003c\/strong\u003e - Class A to ASTM E84 (Flame Spread 0, Smoke 35); Euroclass C-s1,d0 to EN 13501-1 (B-s1,d0 with FRED)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatertight\u003c\/strong\u003e (EN 14891) \u0026amp; intelligent vapour 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 mould resistance\u003c\/strong\u003e (ASTM D3273)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBBA approved\u003c\/strong\u003e; tested to ASTM E2178 and ASTM E84 (Passivhaus certification is held by Passive Purple)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSee the full \u003ca href=\"\/en-la\/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-la\/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-la\/pages\/us-specifications\" title=\"US specifications in CSI MasterFormat\"\u003edownload the US specifications (CSI MasterFormat)\u003c\/a\u003e or order through \u003ca href=\"\/en-la\/pages\/chicago\" title=\"Passive Purple Chicago — distributed and installed by WickRight\"\u003eWickRight, our Chicago distribution \u0026amp; installation partner\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-top: 2px solid #b5985a; margin-top: 28px; padding-top: 18px;\"\u003e\n\u003ch2 style=\"color: #4a1a6e;\"\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003eHelpful guides related to this product:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/blogs\/educational\/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-la\/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-la\/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-la\/blogs\/news\/the-airtightness-challenge-facing-modern-construction-why-blockwork-alone-is-no-longer-enough\" title=\"The Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\"\u003eThe Airtightness Challenge: Why Blockwork Alone Is No Longer Enough\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-la\/blogs\/news\/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-la\/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":162.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/2104\/7636\/files\/Passive_Purple_Home_Pack_1.png?v=1792498643","url":"https:\/\/intelligentmembranes.com\/en-la\/products\/passive-purple-internal-airtight-vapour-control-paint-6-9","provider":"Intelligent Membranes","version":"1.0","type":"link"}