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Have I got cavity wall insulation?

Posted by Cathy Debenham on 27 November 2014 at 9:33 am

Q: We moved into this property 4 years ago, last year the outside wall felt very cold. We think we have got insulation in them, but can they be topped up if so.

A: Cavity wall insulation, done right in a suitable property, can make a significant difference to warmth and comfort as it stops the heat escaping. The easiest way to find out whether you've got some, and whether it has slumped and is leaving cold spots, is to get a reputable installer to have a look with a scope. Alternatively you could ask a drain cleaning company to drill a few 15mm holes in the wall and stick a camera into the cavity. For it to be fully effective you need full coverage of the whole wall, as heat is very clever at finding the gaps to escape through.

Most cavity wall installations use mineral wool because it's cheap and quick to blow in. However, some of the cheap and cheerful installations over the past decade have not been as thorough as you'd want. If that has been the case with you, it's best to ask a good installer what they recommend. You may have to remove what's currently in there and start again, which can be costly. Check out our information page on cavity wall insulation for what to look out for, and for alternatives to mineral wool.  

Photo Credit: NM Energy$mart Academy via Flickr CC

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