How To Tell If You Have A Cavity Wall. A way to tell if you have a cavity wall or not is to check the brickwork on the outside of your home. Another way in which you can check if you have cavity wall is by measuring the thickness of your external walls.
Badcavity.com is here to take the hassle out of your cavity wall insulation problems. Because you are not likely to be qualified to determine if you indeed have a cavity, you will need a dentist to do this.
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Cavity wall insulation in the form of loose fill should be avoided. Cavity wall insulation is a great idea if you have a clean cavity.