Cavity Wall Insulation

Cavity Wall Insulation

Homes that are uninsulated lose 35% of their heat through the walls: cavity wall insulation will stop this heat loss to keep your home warmer and lower your fuel bills.

Solarwall have installed cavity wall insulation since 1977. We are members of the National Insulation Association, the InstaGroup, the Snug Network and our insulation is CIGA approved, which ensures compliance to building regulations.

Key Benefits

  • Improved levels of comfort. An insulated home provides a much more comfortable and cosy living environment than a home that is uninsulated.
  • Fuel bill savings. Insulated homes retain their heat much better and therefore require less heat to maintain a comfortable temperature, meaning you can expect your heating costs to reduce.
  • Improves your property’s energy efficiency and EPC rating. Having cavity wall insulation installed improves your Energy Performance Certificate (EPC) rating, which you will need to provide if you come to sell your home. The better your EPC rating is, the more attractive your property will be when selling.
  • Will lower your carbon footprint. As your home will require less heat to be sufficiently comfortable, your CO2 emissions will be reduced as you will be using less heating. Studies suggest that every square metre of cavity wall insulation will save more than a tonne of CO2 over the average life of the building.
  • Can help to reduce condensation. Cavity wall insulation causes the surface temperature of the inside of the external wall to increase, therefore reducing the risk of condensation on the surface.
  • Stops sudden temperature changes. These can agitate bronchitis and asthma.

How it works

If your property was built post-1920, it most likely has a cavity wall construction. This means the property's external walls are comprised of two layers with a gap (or cavity) between them. In a typical cavity wall building, 35% of its heat is lost through the walls. Cavity wall insulation prevents this heat loss by filling this gap with insulation. 

To fill this gap, an installer would drill small holes (around 22mm in size) at intervals of approximately 1m in the outside walls of your home. With specially designed equipment, the installer then blows insulation into the cavity. Solarwall use insulation made from white mineral wool, usually manufactured by InstaFibre, which will not settle, crack, burn, transmit water, or deteriorate with age. Once all the insulation is installed, the installer fills the holes in the brickwork, which are barely noticeable.


If you have any questions, our Frequently Asked Questions page may be of help to you.

If you are interested in cavity wall insulation or require more information, please contact us - you can speak to one of our Energy Team, who are trained to offer you the most up-to-date and accurate information.

Free Insulation SurveyCIGA

Our insulation is independently guaranteed for 25 years by the Cavity Insulation Guarantee Agency.

For more information, or a free, no obligation quote call us on 0800 138 0079

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