Finishing paint AIRTIGHT BRUSH

liquidfor the building industryfor wall

Product overview
Brush-applied, fibre-reinforced polymer emulsion that dries to form a permanent vapour-control membrane for airtight construction details. Pack: 6.9 kg (Passive Purple Edition). Colour: White. Applied by brush.

Key points

• BBA certified
• M1 classification, VOC free
• Radon barrier
• Fire classification: Class C
• Application rate: up to 300 m² per day per operative
• Air tightness performance: tested to 0.03 ach (air changes per hour)
• Adheres to a wide range of substrates
• Coverage: approx. 1 kg = 1 m²

Why choose Passive Purple Airtight White vapour control membrane?

• Window and door reveals: forms a continuous, brush-applied airtight membrane that does not peel like conventional tapes or silicones.
• Connection joints: bridges larger gaps in wall connections to provide a durable but flexible seal accommodating building movement.
• Walls and ceilings: perimeter application seals wall-to-ceiling junctions to maintain continuity of the vapour-control layer.
• Slab connections: reliable perimeter sealing between slabs, panels and walls.
• Service penetrations: effective sealing around service penetrations where tapes and sheet membranes often fail.
• Cost-effective and fast: can be applied quickly and onto damp surfaces, reducing the risk of adhesive failure associated with tape systems.

Uses

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

Related guides (titles only)

• 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

• Brand: Intelligent Membranes
• Product name: Airtight White Brush Pack
• Collection: Passive Purple Edition
• Application method: Brush-applied
• Colour: White
• Pack size / net weight: 6.9 kg (Brush edition)
• Coverage: approx. 1 kg = 1 m²
• Product type: fibre-reinforced polymer emulsion vapour-control membrane
• Application productivity: up to 300 m² per day per operative (typical)
• Air tightness: tested to 0.03 ach (application dependent)
• Fire classification: Class C
• Indoor emissions: M1 classification, VOC free
• Radon protection: provides radon barrier
• Substrate compatibility: adheres to concrete, brick, wood, PVC, aluminium, polyurethane foam, blockwork, OSB
• Certifications: BBA certified