Closed cell foam sealing older roofs with no ventilation
Why it happens here
Most St Marychurch roofs were built before ventilation was considered. When closed cell foam is sprayed directly onto the felt, it blocks the only route for moisture to escape. Condensation builds on the timbers through the winter and rot sets in within a few years.
Our approach
We remove the foam across the full roof pitch, not just the visible areas, and check every rafter with a moisture meter. Where ventilation is missing, we advise on tile vents or felt laps so the roof can breathe before any new insulation goes in.