Trapped moisture and condensation in sealed lofts
Why it happens here
Spray foam applied directly to roof felt stops the roof breathing. In Tormohun's older slate and tile roofs, warm damp air from the house condenses on the cold felt and cannot escape, so rafters stay wet.
Our approach
We remove the foam in sections, inspect the felt and rafters, and add ventilation at the eaves. Where needed, we recommend breathable insulation so the roof can dry out and stay dry.