Spray foam insulation failing building regulations
Why it happens here
Foam sprayed against a cold roof deck changes how the roof performs and often fails to meet Part L ventilation requirements. In Brixton's Victorian terraces there is rarely a compliant ventilation gap left after the foam goes in, so the roof space cannot manage moisture.
Our approach
We assess against Part L before quoting, remove the foam where it fails, and specify a compliant replacement insulation and vapour barrier as part of the same job. You get a roof space that will pass a surveyor's re-inspection, not just a cleared void.