If my house was built with a cavity, surely it’s there for a reason?
The purpose of the cavity is to prevent rain that soaks into the outside brickwork from crossing to the inside of the wall. The cavity interrupts any water that soaks through the brickwork and drains it to the bottom of the wall where it drains to the outside. Injecting mineral wool insulation into the cavity still allows water to drain to the bottom of the wall. ask the installer about Knauf Supafil cavity wall insulation, which contains a water repellent and so does not absorb water. Extensive tests have shown that Knauf Supafil cavity wall insulation does not cause water to pass across the cavity.
Posted in: Cavity Wall Insulation