Wall insulation is the application of insulating materials on the interior side of external walls to improve the thermal performance of a building. Insulation can improve heat retention in a building, prevent moisture condensation, and more widely help reduce emissions and pollutants as less power is needed to maintain the heat of a space.

Main types of wall insulation

Batts and rolls (blanket insulation)

Commonly used in walls, attics and floors, and made of fibreglass.

Foam board or ridged foam

A foam board that doesn’t allow air to pass through, commonly used on exterior walls, roofs and foundations.

Insulating concrete forms (ICFs)

Installed as part of the building structure. They are hollow foam blocks or panels that are reinforced with rebar (steel bars/steel mesh) and filled with concrete.

Spray foam insulation

Ideal for hard to reach areas, foam insulation is sprayed onto walls where it then sets. However, it is more expensive than other types of insulation.

Wall insulation can also be used for acoustic reasons, to ensure noise and vibration doesn’t travel outside of a space.