Signs your insulation has failed
Damp patches, mould, cold spots and wet walls after cavity wall insulation: what each sign means and how a survey tells the cause.
Book a free survey
Four details and we do the rest. No charge, no obligation.
Failed cavity wall insulation shows up as problems that get blamed on the roof, the gutters, the plaster or the heating: a patch on the bedroom wall that darkens after rain, black mould in the corner behind the wardrobe, a room that costs a lot to heat and never feels warm. Sometimes those things are the roof or the gutters.
If a lender or surveyor has flagged a filled cavity and a mortgage, remortgage or sale is stuck, removing the failed insulation may help, and the completion certificate is what you show the lender.
What we look for, and what you can look for yourself:
- Damp patches after cavity wall insulation: where they appear, why they follow the weather, and what else could cause them.
- Mould and condensation: cold walls, wet air and the mould that grows where they meet.
- Cold spots: voids, slump and missed areas that a thermal camera or the back of your hand can find.
- Slumped or wet insulation: what is happening inside the wall when the fill gives up.
- Exposure and driven rain: the four exposure zones, and why the guidance says many walls in the wetter parts of Britain should not have been filled.
- Questions about failed insulation.
If any of it sounds like your house, the survey is free and the quote is in writing. We reply within one working day to arrange a free survey and quote.
Book a free survey and we will tell you what your wall needs and what it costs.
In this section
Pages on signs your insulation has failed
Free survey
Book your free survey
Or email [email protected]. Your details are used to answer you and for nothing else: see the privacy policy.