Vapour control (passive purple)

What is vapour control? Every occupied building pumps moisture into its own walls. Cooking, showers, even breathing fill the air with warm, humid vapour. When that vapour gets into the structure and hits a cold surface it condenses, and you get damp insulation, mould and rotting timber. A vapour control layer (VCL) is the barrier on the warm side of the construction that manages how much moisture can pass in, so the building fabric stays dry and the insulation keeps working.

Traditionally that meant plastic sheets, laps and tape, where every staple hole and torn lap is a leak. Our answer is vapour control paint. Passive Purple and Airtight White are liquid-applied VCLs, sprayed, rollered or brushed into one seamless membrane that is airtight, vapour-controlling and Passivhaus certified. The coloured finish doubles as quality control, so you can see at a glance which walls have been done.