Will Cavity Wall Insulation Cause Damp. So i thought i'd try to shed a little light lots of people say not to retrofit cavity wall insulation as it causes cavity wall insulation problems such as allowing damp to cross the cavity. Cavity wall damp and how to diagnose cavity damp issues and fix them.
It is made possible because whatever moisture get penetrated through the outer leaf is subjected to evaporation by the air inside the cavity.
Cavity wall insulation is used to reduce heat loss through a cavity wall by filling the air space with material that inhibits heat transfer. Retrofit cavity wall insulation is essentially an insulating material that's injected into the gap between the outer and inner brickwork layers of your external wall. I have to say that the building regs in the 90s made cavity insulation mandatory so are you certain some is. If the insulation gets wet, it can become worse than useless, because moisture evaporating on the warm side of the wall can actually make that side colder.