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A guide to cavity wall insulation

What is cavity wall insulation?

More heat is lost through your walls than any other part of your home. Cavity wall insulation helps to instantly reduce heat loss by 40% by plugging the gap between the two layers of brick that make up your outer wall. By filling this gap with insulation, it makes it difficult for heat to pass from the inside of your house, to the outside world.

The actual insulation material used can vary, but is typically made up of pockets of air, which prevents convection from occurring and greatly reduces any heat loss

Not all houses can receive cavity wall insulation. As the name suggests, there needs to be cavity, or gap, between the two layers of brick which make up your outside wall. If your home was built between 1930 and 1995, you are most likely to be suitable.

The installation process is simple and relatively quick. Cavity wall insulation can be installed within about 2 hours within minimal disturbance inside your home. Holes of around 25mm in diameter are drilled into the outer layer to reach the cavity inside. Several holes are drilled a metre or so apart and the insulation material is blown or injected in.

Cavity wall insulation can help to:

* Reduce your heating bills by up to £115 per year   (source: Energy Saving Trust)

* Increase the value and saleability of your home

* Increase your energy rating

*Create a warmer and more comfortable environment for your family

Is my home suitable for cavity wall insulation?

It is very important to check the suitability of your home for receiving cavity wall insulation before any work is done. A survey should always be carried out prior to any work being done, and a qualified surveyor will be able to assess suitability. He or she will consider the exposure of outside walls to wind and rain, and also the method of construction used.

If you have a problem with damp or moisture inside your home, you should notify the surveyor of this before any work is carried out.

Similarly, if there has been any frost or structural damage to the walls in the past, the surveyor also needs to be made aware of this.

Can I receive a grant towards the cost of my insulation?

In 2008, the Government announced a scheme to help homeowners and tenants with the cost of insulating their home. Insulation grants are available to homeowners and tenants looking to reduce their energy bills, and make their home more eco-friendly by installing insulation.

The grants are part funded by the government, and part funded by the energy companies (at a cost of £910 million! Source: Energy Saving Trust).

Calculate your insulation grant eligibility here.