What to look for and why timber condition matters more than the foam itself.
Foam hides what is underneath it, which is exactly why timber condition is worth checking.
Dark staining on exposed rafters, a musty smell in the loft, damp patches on upstairs ceilings or foam that has begun to lift away from slates can all point to moisture.
Moisture readings on reachable timber show whether wood beside the foam is drier or wetter than it ought to be, which helps decide whether to leave, monitor or remove.
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