Cavity wall insulation acts as a blanket to help stop heat escaping through the walls of your home. Insulating your home isn’t a one off saving either, it will keep your home warmer in the winter and cooler in the summer, helping you to save money on your energy bills year after year. It’s simple to install and usually takes less than a day. Cavity Wall Insulation is a filling blown into the gap between your exterior wall, so there’s little fuss or mess.

Cavity wall insulation is a fantastic way to significantly reduce the amount of energy you need to heat your home. The average house could reduce heating costs by 15%. In fact, between 2002 and 2005 around 800,000 households installed cavity wall insulation.
It is estimated that these households will collectively be saving nearly 400,000 tones of carbon dioxide a year, enough to fill the new Wembley Stadium 46 times…every year!


How is insulation installed?

To insulate your cavity walls, the installer drills small holes around 22mm in size at intervals of around 1m in the outside wall of your home. With specially designed equipment, they then blow insulation into the cavity. Once all the insulation is in, the installer fills the holes in the brickwork so you’ll barely notice them.

Filling cavity walls is not a job you can do yourself: you will need to find a registered installer. A professional can do the job in around two hours for an average house with easily accessible walls; it should be simple, quick – and make no mess.

Your installer should be a member of one of these organisations:

the National Insulation Association (NIA) (Go to the NIA website)
the Cavity Insulation Guarantee Agency (CIGA) (Go to the CIGA website)
the British Board of Agrément (BBA) (Go to the BBA website).

What is the insulation made of?

Cavity wall insulation can be made out of three types of materials:

  • mineral wool
  • beads or granules
  • foamed insulants.

All three are manufactured according to British standards. Foam Insulation systems should be certified by the British Board of Agrément and installed according to strict guidance laid out in the associated BBA Certificates.

What we recommend !!!

Your installer will suggest the most suitable type of insulation for you but check that the installation is covered by under the Cavity Insulation Guarantee Agency (CIGA): this means it complies to British standards and it has a 25-year guarantee. Ask your installer to make sure you make the best choice.