Foam trapping condensation against roof timbers
Why it happens here
Most Chetwynd roofs were built without a vapour barrier or felt. Spray foam seals the roof from the inside, so moisture from the house cannot escape and condenses on the cold timber. Over years, that rots the rafters.
Our approach
We remove the foam, inspect and treat the timbers, and fit ventilation trays to restore airflow. On Chetwynd's older roofs we also check the eaves for blocked vents.