Polymer vapor barrier AIRTIGHT WHITE BRUSH PACK

VOC-free liquidfor wallfor floor

Product overview
Airtight White — 6.9 kg pack, Passive Purple Edition. Fibre-reinforced polymer emulsion applied by brush; dries to form a permanent vapour control membrane. Brush-applied product suitable for airtightness detailing and sealing on a range of substrates.

Key points

• BBA certified
• M1 class, VOC free
• Radon barrier
• Fire classification C
• Application productivity: up to 300 m2 per day per operative
• Airtightness performance: achieves ~0.03 ach when correctly installed
• Adheres to multiple substrates
• Coverage guidance: approx. 1 kg per m2

Why choose Passive Purple Airtight White?

• Window and door reveals: fibre-reinforced composition seals reveals into a durable airtight vapour control membrane that will not peel like some silicones and tapes
• Connection joints: bridges larger gaps in wall connections and joints providing a flexible, long-lasting seal
• Walls and ceilings: perimeter application provides airtight sealing of wall-to-ceiling connections
• Slab connections: perimeter application seals slabs to panels and walls
• Service penetrations: effective around penetrations where tapes and membranes often fail
• Cost effective: brush application is fast, bonds on damp surfaces and reduces failures associated with tapes

Uses

• Floor / wall connections
• Wall / ceiling connections
• Window / wall connections
• Pipe / service penetrations
• Wall / wall connections
• Vertical and horizontal joints
• Curtain walls
• Roof connections (steel deck)

Application guidance (summary)
For service penetrations: apply polyurethane foam around the penetration, allow to harden, remove excess foam, then apply a generous, well-covering layer of Airtight White with a flat paintbrush to form a continuous airtight membrane. Airtight White adheres to concrete, brick, wood, PVC, aluminium and polyurethane foam.

Related guides (titles)

• What Is a Vapour Control Layer? | VCL Explained
• My Builder Forgot the Vapour Control Layer? Here’s How to Fix It
• How to Retrofit Vapour Control Without the Mess

Technical specifications

• Product collection: Passive Purple Edition
• Applied by: Brush
• Colour: White
• Pack mass: 6.9 kg (Passive Purple Edition - brush)
• Product type: Fibre-reinforced polymer emulsion (liquid-applied vapour control membrane)
• Application: Brush-applied — dries to a permanent vapour control membrane
• Coverage: Approx. 1 kg per m2
• Typical application productivity: Up to 300 m2 per day per operative
• Airtightness performance: ~0.03 ach when correctly installed
• Certifications & ratings: BBA certified; M1 class (VOC free); Fire classification: C; Radon barrier
• Adhesion: Adheres to concrete, brick, wood, PVC, aluminium and PU foam