Internal wall insulation

Three stylized rectangles with different designs, overlapping each other.

warmer in winter, cooler in summer.

If your home was built before the 1920s, its external walls are probably solid walls rather than cavity walls.

However solid walls can still be insulated. It’s a different process, and normally a more expensive one. However, it can lead to higher savings than with cavity wall insulation.

Internal wall insulation

Internal Wall Insulation (IWI) is used to insulate solid wall properties. It is installed internally to the heat-loss walls and is a great solution when external insulation is not feasible or too costly.

Solid walls let twice as much heat escape than cavity walls, and IWI is one of the most cost effective measures for improving thermal efficiency in the home. Typically up to 45% of heat is lost through un-insulated solid walls (Source: National Insulation Association, 2014). Rooms with internal solid wall insulation, when heated, become warmer much quicker – and in the summer it keeps the heat out too. The Energy Saving Trust estimates solid wall insulation can cut fuel bills by up to £455 per year.

We provide a range of IWI systems in order to meet the specific needs of your property. All our systems have BBA certification and are designed to be installed directly on to an existing solid wall in one easy installation. Once completed all systems will leave a smooth plaster finish that requires minimal decoration. All our IWI installers have completed a rigorous manufacturer training programme so that the system is always installed correctly and consistently.

Room with exposed wall insulation and a wooden door