Roof rot from trapped moisture
Why it happens here
Spray foam seals the loft, so warm moist air from the house cannot escape. In Forestdale's older properties, the roof felt is often the original bitumen, which does not breathe. Moisture condenses on it and soaks into the rafters.
Our approach
We remove the foam, check the timbers with a thermal imaging camera and treat any early decay. We also restore ventilation so the loft can dry out properly.