Collection: Wall Membranes

Liquid-applied membranes for every wall in the building. Internally, Passive Purple and Airtight White handle airtightness and vapour control; externally, Passive Purple External (fire rated Class B) weatherproofs façades. Poseidon tanks bathroom and wetroom walls, Waterproof Blue deals with damp, and FRED adds a Class A2-s1,d0 fire retardant thermal barrier over timber and spray foam. Whatever the wall needs — airtight, waterproof, fire rated or all three — it goes on by spray, roller or brush and cures to one continuous membrane.