Cavity wall insulation involves filling the gap between a property’s inner and outer walls with insulating material. This helps reduce heat loss and improves energy efficiency. Before checking insulation, it’s essential to know if your property has cavity walls, typically found in homes built after the 1920s with evenly spaced brick patterns.
Look for Visual Signs and Property Age
Start by examining the brickwork. Homes with cavity walls usually have bricks laid in a uniform pattern and measure over 250mm thick. You can also check for small drill holes in the mortar—evidence of past insulation work. If your house was built before the 1990s, it’s worth verifying whether insulation was ever installed.
Hire a Professional for an Accurate Inspection
The most reliable way to check cavity wall insulation is by hiring a qualified surveyor. They use specialist tools like thermal imaging cameras or borescopes to inspect wall cavities without causing damage. A professional assessment ensures you receive a clear report on whether insulation is present, adequate, or needs replacement.
