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Internal Wall Insulation

Insulating internal walls could make a big impact on annual heating bills, but requires careful consideration prior to installation.

Uninsulated walls account for 35% of the total heat loss from the average home.

When it comes to insulating walls, we tend to think of cavity-fill insulation, but this is not a solution for solid walled homes. More heat escapes through solid walls than those with cavities. Solid walls let through twice as much heat as cavity walls do.


For solid walled homes, we can either insulate externally  to the facade of the building, or internally - both could save up to £455 on annual heating bills, according to

Internal Wall Insulation

the Energy Saving Trust. The former will inevitably change the look of the building, and the later may encroach on internal floor space.

Internal wall insulation involves the application of insulation to the interior face of external walls in order to improve the thermal performance of the property.

There are three basic methods of installing internal wall insulation, and the process is broadly the same for all three :-


  • Insulating the wall directly;

  • Fix the insulation with battens;

  • Insulating with a stud wall.


The most common insulating material used is a rigid foam board. These boards are better insulators than the alternatives and so they are thinner and take up less floor area. They can also incorporate a vapour barrier. 


Benefits of Internal Wall Insulation :-


  • Increases the life of your walls by protecting the brickwork;

  • Improves weatherproofing and sound resistance;

  • Can substantially reduce your heating bills;

  • Fills cracks and gaps in the brickwork, which will reduce draughts;

  • Reduces condensation on internal walls and can help prevent damp;

  • Improves your home's energy efficiency rating (EPC Rating).

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