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B&Q£119.99Visit shop B&Q - Airtight WhiteVapour ControlAirtight & Smoke Tight Paint (11.4Kg)Spray / Roller Applied
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Designed for architects, builders, and eco-conscious renovators, the Passive Purple Airtight Liquid Vapour Control Membrane is an ideal solution for achieving high-performance building envelope sealing in both residential and commercial projects. Its primary benefit lies in creating a seamless, VOC-free barrier that effectively stops air leakage and controls moisture while resisting hazardous gases like radon and methane. While it offers superior flexibility and durability compared to traditional vapour barriers, users should note that proper application requires either professional airless spraying equipment or careful roller technique to ensure the recommended thickness for full airtightness performance.
| Colour | White |
|---|---|
| Model Part Number | IM/00ATWS11/4 |
| Brand | B&Q |
Yes, it is chemically neutral and compatible with most common insulation materials, including mineral wool, EPS, and rigid PIR boards.
Passive Purple is designed as an internal vapour control membrane for the building envelope. It is not intended for exterior use exposed to direct weather or UV.
It significantly reduces the need for complex taping by sealing junctions seamlessly, though specific high-movement expansion joints may still require specialized detailing.
For optimal curing and adhesion, do not apply the product if the temperature is below 5°C or expected to drop below freezing within 24 hours.
Coverage depends on substrate porosity; generally, one 11.4kg container covers a significant area, but always perform a small test patch to determine the exact consumption rate for your specific wall finish.
Yes, it carries a Fire Class C rating, meeting standard building safety requirements for internal wall coatings.
This usually indicates the coating was applied too thinly or over a surface that was too dusty. Ensure a uniform, specified thickness and clean surfaces thoroughly.
Ensure the product is thoroughly mixed before loading the sprayer. Filter the material if necessary and flush the machine with water frequently during long pauses.
Check the moisture content and cleanliness of the substrate. If the surface is extremely porous or friable, apply a suitable primer first.
Before application, ensure all surfaces are clean, dry, and free from loose debris or dust. While the product adheres well to most mineral substrates, priming may be required on highly porous surfaces.
