If your house was built after the 1920s, it is likely to have cavity walls. Older houses are more likely to have solid walls. If your home was built in the last 10 years, it was probably built with insulation installed at the time.

If you can see the brickwork on the outside of the house, look at the pattern of the bricks. If your home has cavity walls, the bricks will usually have a regular pattern like this:


If your home has solid walls, the bricks will have an alternating pattern like this:


If the brickwork has been covered by render, you can also tell by measuring the width of the wall.  Examine a window or door on one of your external walls. If a brick wall is more than 3000mm thick, (from the outer wall to inner wall) then it probably has a cavity; a narrower wall is probably solid. Stone walls may be thicker still but are usually solid.

If your house is a steel-frame or timber-framed building, or is made from pre-fabricated concrete, different rules apply for insulation and this should be surveyed by a specialist before and if any insulation is fitted.

Modern technology tells us that up to 40% of our home energy heat can be lost through a cavity wall if not insulated. A Government backed scheme aimed to help fill these cavities with insulation and keep our homes warmer while reducing the amount of energy needed to warm our homes, and have a better impact on energy saving.

The product itself is really good, if the property is suitable and the installer has done proper pre-checks and installation, the difference can be outstanding. Millions of homes had the cavity wall insulation installed and it is estimated up to 3 million homes may be at risk of serious damp issues or even structural issues and health risks where the installation was not carried out to the agreed specifications.

If a cavity is not filled 100% compact, void areas can gather moisture and lead to damp. Where a cavity is not fully clean and cleared of debris, this can bridge the gap and again introduce moisture and cause damp. The lack of ‘brushing off’ a cavity that joins a neighbour’s property means insulation may seep out into the next door cavity and lead to voids in your walls, or cross contaminate if different materials are used. An active damp course should be in place to keep the damp to ground level and not reach the cavity wall insulation as this can soak and travel up the walls causing damp. There are many other reasons why incorrect installation can cause damp and other problems.

Those who installed the cavity wall insulation should have carried out a pre-survey assessment to ensure the property itself was suitable for cavity wall insulation and subsequently assessed that there were no hazards present that could cause failure and problems of the cavity wall insulation later down the line.

The good news is that most cavity wall insulation firms had to register the installation with CIGA – Cavity Insulation Guarantee Agency, which then offered a 25-year guarantee for the insulation.

The bad news is that it can cost a considerable amount of time, money and work to rectify a bad installation.
Wall Cavity Claims is a legal services company who offer a free survey to assess your cavity wall insulation and ensure it was installed correctly, and if not, we have access to specialist panel solicitors who work  No Win No Fee. 

Or call us FREEPHONE – from landlines & mobiles – call 0800-8-654321


  • Noel O'Riley

    Thanks for the info. We have some signs of damp in our house and never thought it might be the cavity wall insulation. I have phoned CIGA for a copy of my guarantee and will contact you through the week.

  • WCC Admin

    Hi Noel.
    That’s what we hear most from clients, but people are becoming more aware.
    Your CIGA should arrive within a few days. If it has not arrived within 7 days we would suggest calling CIGA again and also sending them an email or contact through their website.
    Here when you need us.
    WCC Admin

  • Paul Matthews

    Hi. I live in Halifax and we are very exposed to the severe weather where our house is situated, and after having insulation installed 5 years ago we have had several issues with damp and mould.

    Only recently are we thinking it could be caused by the insulation, and thinking about the process it was surveyed and installed within 24 hours and the whole process was too quick and noone explained properly or showed us before or after.

    We have a copy of our CIGA. Can you help?

    • Wall Cavity Claims

      Hi Mr Matthews. If you still require any help please call us freephone 0800-8-654321

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  • Mandy & Peter

    Thanks for your help. I have just had a part offer of settlement to cover some of the first part of the repairs while my home dries out and re-estimate the full costs of the repairs as we need to check the wall ties again as they seem to be damaged and could be an additional £6000 on top of the claim. Everything you said was right and we are extremely grateful for all your blogs and information. Mandy and Peter K.

    • Wall Cavity Claims

      Great to hear Mandy & Peter. Always here if you need anything at all.

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