An Airtight Vapour Control Layer You Can Leave On Show
Most airtight membranes have to be hidden behind plasterboard. But in car parks, plant rooms, museums, stairwells and service risers, the airtight layer is often left exposed — so it needs to look the part as well as perform.
The problem
Standard sheet membranes and dark liquid coatings look unfinished if left on show, and a vapour control layer that’s been missed is awkward to add once plasterboard is up. On exposed structures you need an airtight, vapour-controlling layer that doubles as the finish.
What a VCL actually does
A vapour control layer sits on the warm side of the insulation and limits warm, moist internal air from passing into the structure where it can condense. Done properly it also forms part of the airtight line — the two jobs go hand in hand, which is why a combined airtight vapour control membrane is so useful.
The solution: Airtight White
Airtight White is a VOC-free, BBA-certified white airtight vapour control membrane. It can be applied directly to plasterboard or masonry, left on show or painted over, and also acts as a radon and methane barrier — making it ideal for exposed environments that still need to perform.
How it is applied
- Apply to a sound, dust-free surface (prime porous substrates first)
- Spray or roll across the area in the required coats
- Leave on show, or overpaint once cured
Benefits
- Clean white finish that can stay exposed
- VOC-free and BBA certified
- Also a radon and methane barrier
- Airtight and vapour-controlling in one
Frequently asked questions
Can it really be left visible? Yes — that’s its main advantage; it’s designed as a finish as well as a membrane.
Can I paint over it later? Yes — it takes overpainting once cured.
New to vapour control? Read What Is a Vapour Control Layer? or browse airtight paint.