Foam sprayed directly onto roofing membrane
Why it happens here
In Victorian terraces around York Place and Kings Road, there is often no gap between the membrane and the foam. That blocks airflow completely, so condensation forms on the underside of the membrane and soaks into the timbers. It is the single most common cause of roof timber rot we see in the town centre.
Our approach
We remove the foam carefully with a spray foam removal saw, check the membrane for damage, and restore a ventilation gap. Where the membrane is sound we leave it in place; where it is not, we advise on repair before any replacement insulation goes in.