Collection: Retrofit Vapour Barrier Membrane

Airtightness for buildings that already exist. Our Retrofit Airtightness paints go on by brush (5kg) or spray/roller (10kg) to form a continuous vapour barrier membrane over existing walls and ceilings — no stripping back to the frame, no re-boarding. Seal junctions and penetrations with Passivhaus Airtight Sealant and Airtight Tape as part of the same system, and bring an older building's air leakage down without gutting it. Made for EnerPHit, retrofit schemes and every draughty semi in between.