A Guide to Cavity Wall Insulation

A lot of UK homeowners are turning to cavity wall insulation (CWI) to keep their homes warmer all year round. By now, you’ve probably heard of CWI, but with so much talk you might be confused about what the service actually is, and what it can do for your home. Here’s our guide to what CWI is, how it can benefit your home, and what potential downsides you need to keep an eye on.

What is CWI?

Most typical homes in the UK can have two types of wall: solid walls and cavity walls. If your property was built after the 1920s, it’s likely that it will have cavity walls. This means that the house actually has two walls at its perimeter – one outer layer made of brick, and an inner layer that will either be made of brick or, in some instances, concrete.

If your home was built after the turn of the millennium the case may be that it was built with insulation in the cavity walls. However, if it was built before this the inner and outer walls can easily be filled with insulation, helping to keep the heat in and your house warmer.

Cavity wall insulation can be made of a variety of different materials, but is most commonly cellulose or glass wool. It is installed by drilling holes into the outer walls of your home and blowing the insulation through.

CWI done well

When installed correctly, cavity wall insulation can have some great benefits for your home – and your wallet. It is one of the best ways to make savings on your heating bills. On average, homeowners can save around £275 from having insulation, as it negates the need to have your central heating on as high in the cold winter months.  The Government’s Affordable Warmth initiative offers grants for household’s that receive benefits, you can find out if you qualify here.

Things to watch out for

If not installed correctly, CWI can cause some problems for your home. CWI has been known to cause damp, condensation, and mould in homes. When considering cavity wall insulation, you should always make sure you go with a trusted, registered installer and never try to take the task on yourself. A professional registered installer should be able to fully assess the walls of your property, and advise you what sort of insulation is best.

If you fear that your CWI may be installed incorrectly, or is causing problems in your home, you can have it extracted. You can find out more about CWI extraction by browsing our website.

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