Cavity Wall Insulation The Positives and Negatives

Contractor with roll of cavity wall insulation

What is Cavity Wall Insulation? Cavity Wall Insulation (CWI) is the process of filling the ‘gap’ or cavity between two layers of brickwork with an insulative material, sometimes a foam board or sometimes a material made up of beads is injected into the wall. The material used depends on whether the building was built with […]