Because foam covers the timbers, damp problems can build up out of sight.
What to notice
A musty smell in the loft, dark patches on bedroom ceilings, mould near the eaves or condensation on the underside of the hatch are all worth investigating.
What a check involves
Moisture readings on rafters and battens wherever we can reach them, plus photographs of any staining or softness. Where timber is hidden, we explain what could be done to look.
Related: Damp check under foam