Condensation trapped against roof timbers
Why it happens here
Spray foam acts as a vapour barrier, so moisture from inside the house cannot escape through the roof. In Oreston's coastal climate, that moisture condenses on the cold timber and felt, especially in winter. Older roofs with limited ventilation make it worse.
Our approach
We remove the foam, check the moisture content of the timber, and clear any blocked eaves or vents. If the roof needs extra ventilation, we tell you what to add so the problem does not come back.