Roof rot from trapped moisture
Why it happens here
Coulsdon sits against the North Downs and takes more wind-driven rain than most of Croydon. Foam sprayed between rafters stops the loft ventilating, so moisture condenses on cold timbers and rot sets in within a few winters.
Our approach
We remove the foam completely, check every rafter with a thermal imaging camera and moisture meter, and treat any early decay before it spreads. You get photos of the timbers once they are exposed.