Possible causes
- Poor roof ventilation
- Non-breathable felt
- Warm, moist air rising from the house
- Spray foam insulation trapping moisture
Warning signs
- Droplets on the underside of the felt
- Black mould on timbers
- Damp insulation without an obvious leak
Typical solutions
- Improving ventilation
- Fitting a breathable membrane during re-roofing
- Removing spray foam where it's causing problems
When to get it inspected
If you see moisture or mould in the loft. Condensation and leaks can look alike, so it's worth having it checked.
This page is general guidance, not a diagnosis. Call 01322 902061 to book an inspection, or read about our spray foam removal service.