Roof rot from trapped moisture
Why it happens here
Spray foam blocks airflow in the loft, so condensation cannot escape. In Waddon's older roofs, the timbers stay damp for months and start to rot. This is especially common in terraced houses near Waddon Station where vents were already limited.
Our approach
We remove the foam, inspect every timber with a thermal imaging camera and treat any rot we find. We also clear or add vents so the roof can dry out. Catching it early saves the cost of replacing rafters.