Foam sprayed across rafters with no ventilation gap
Why it happens here
Installers often sprayed foam tight to the felt and across the full rafter depth, which seals the roof space. In Efford's coastal air, that trapped moisture condenses on the timber and starts working its way into the rafters within a couple of seasons.
Our approach
We remove the foam in sections, clean the rafters back to bare timber, and open up the eaves ventilation so the roof space can breathe again. Moisture readings before and after show the difference, and we leave a clear gap for airflow.