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Cavity Wall Insulation CWI

Cavity Wall Insulation


Properties can lose up to 10% heat through an uninsulated cavity wall.  It is recommended that high-grade cavity insulation is used to minimise heat escape.


Not sure if you have cavity walls?


If your home was built after 1920, the chances are that its external walls are made of two layers with a gap or cavity between them. Cavity wall insulation fills that gap, keeping the warmth in to save energy. It can also help reduce condensation inside the house if this is a problem on your external walls.


Your home will usually be suitable for cavity wall insulation if:


  • its external walls are unfilled cavity walls
  • your cavity is at least 50mm wide
  • the masonry or brickwork of your property is in good condition
  • it is more than ten years old
  • the walls are not exposed to driving rain.


If your house was built in the last ten years or so, its walls are probably insulated already. To find out whether they are:


  • ask a registered installer for a boroscope inspection. They will drill a small hole in your external wall to see if your walls are hollow or filled
  • check with your local authority's building control department

Are your external walls easy to access?


Cavity wall insulation is blown into the cavity from the outside of the property. Every part of the wall must be filled with insulation, so it is important that the installer can reach all your external walls.


If your property's external walls are joined to another house, the installer will need to insert a cavity barrier to contain the insulation, so your neighbours are not affected.




Contact our team on 0121 241 5250 or email: to discuss how KM Renewable Energy can meet your requirements


KM Renewable Energy UK

Renewable Energy, Prefab Construction,

Energy Efficiency & Finance

25 Lee Bank Business Centre

Holloway Head


B1 1HP

0121 241 5250


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