What is the purpose of a cavity wall?
The purpose of the cavity wall is to help prevent rain water from penetrating through the outer wall to the inside of the property.
Cavity masonry walls were introduced on the exposed western coasts in the early nineteenth century, to stop penetrating dampness to the inside surfaces due to wind-driven rain. Due to the success at preventing penetrating dampness the construction of cavity walls spread to other, dryer, parts of the country, with the added benefit of the natural insulation created by air layer trapped within the cavity. Continue reading