Airtight White Brush: High-Performance Airtight Membrane for Internal Vapour Control - Brush-applied Liquid Airtight Membrane

Airtight White Liquid Brush vapour control membrane is a much thicker airtight vapour control paint. It is the paintbrush applied version of Airtight White. For small projects, such as private houses, Airtight White Brush can be used with a flat paintbrush. In this case, an airless spray device is not needed. The wall/ ceiling connections also need to be made airtight, especially when the connections are made of two different types of construction materials such as red brick/ concrete or steel/ concrete.

Different construction materials react differently to changes in humidity and temperature, moving at different rates, which can lead to small cracks in plaster or another type of finishing. That movement can create air leaks that cause your building’s energy performance to suffer and potentially open the gateway for damp and mould to appear. Both products can be used for these wall/ceiling connections: Airtight White, vapour control membrane can be applied with an airless paint spray device. Or Airtight White Brush vapour control paint can be applied by brush.

High technology, fibre-reinforced polymer emulsion applied with a paintbrush. Dries to form a permanent vapour control membrane.

Service penetrations can be the downfall of any air tightness or flexible membrane testing. Airtight White and Airtight White Brush vapour control paint are applied around objects that penetrate any surface to the external envelope, sealing where most tapes and membranes fail.

Before you apply Airtight White or Airtight White Brush, first apply polyurethane foam around any penetrations. After hardening, remove the excess foam and apply a generous amount of Airtight White Brush with a flat paintbrush. In all cases, apply a sufficient, well-covering layer for reliable airtightness and a guaranteed airtight membrane.

Airtight White vapour control membrane can be applied (and is tested) on different construction materials such as concrete, brick, wood, PVC, aluminium and polyurethane foam. With a coat of Airtight White, the whole window/door reveal can be made airtight.

A polymer-based paste which is applied with a paintbrush and dries to an airtight vapour control membrane (AVCM) with excellent adhesion on different substrates.

Features and benefits:

• This product is ready to use and can be applied both vertically and horizontally.
• Volatile organic content (VOC)-, carcinogen-, ammonia- and formaldehyde-free.
• A Passivhaus certified score of 0.03 ACH which is 20x lower than the required 0.6 air changes per hour (ACH).
• Can guarantee a score of 0.6 ACH.
• A single installer can apply up to 300 m² of Passive Purple a day using an airless spray device. Construction is sped up, and labour costs are dramatically reduced with this easy airtight pain.
• M1 class.
• BBA certified.
• M1 class, VOC free (volatile organic compound).
• Radon barrier.
• Fire class C.
• Up to 300 m² a day per operative.
• 0.03 ACH (air changes per hour).
• Adheres to any substrate.
• Windows and door reveals are a common culprit for allowing significant air leakage. With its fibre-reinforced make-up, Airtight White Brush will completely seal and dry into a tough airtight vapour control membrane that will not peel or become unstuck like your classic silicones and tapes.
• Bridge the larger gaps in the wall connections and joints for a tough yet flexible seal which allows itself to work with building settlement before spraying over with Airtight White Spray.
• Completely seal the wall to ceiling connections with a perimeter application of Airtight White Brush vapour control membrane or airtight membrane Spray.
• Completely seal the slabs to panels and walls with a perimeter application of Airtight White Brush or Spray.
• Service penetrations can be the downfall of any building. Airtight White and Airtight White Brush are applied around objects that penetrate any surface of the external envelope sealing where most tapes and membranes fail and are too awkward to apply.
• Cost Effective and can be applied with great speed and on damp surfaces.

Technical characteristics:

• Density: 1.2 kg/L.
• Resistance to fatigue movement (to EOTA TR008): No cracking or delamination.

- Adhesion (to ISO 4624):

• Red brick: 1.5 N/mm² (dry), 1.4 N/mm² (moist).
• Concrete: 1.9 N/mm² (v) (dry), 1.6 N/mm² (v) (moist).
• Ytong block: Adhesion value exceeding substrate strength, 0.8 N/mm² (dry), 0.7 N/mm² (moist).
• Gypsum block (Isolava): 1.6 N/mm².
• Oriented strand board (OSB) wood: Adhesion value exceeding substrate strength, 0.6 N/mm².
• Multiplex wood: Adhesion value exceeding substrate strength, 0.6 N/mm².
• Ethylene propylene diene monomer (EPDM) rubber ISO 4624 (Tridex): Adhesion value exceeding substrate strength, 1.3 N/mm².
• Roofing: Adhesion value exceeding substrate strength, 0.7 N/mm².
• Plaster (Knauf MP75) on PASSIVE PURPLE: Adhesion value exceeding substrate strength, 0.4 N/mm².
• Thin plaster (ALLTEC) on PASSIVE PURPLE: 0.8 N/mm² (v).