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Cavity Wall Insulation Damp Problems & How To Avoid It

Published by on October 30, 2018

Cavity wall insulation is an excellent solution to reducing your energy bills by making your home more energy efficient. This makes it very attractive to homeowners, especially considering there are a lot of grants that allow eligible homeowners to get the insulation for free. However, issues can arise and the biggest threat is damp.

Should you be concerned if you have or want to get cavity wall insulation?

If you’ve had cavity wall insulation installed for years and haven’t experienced any damp issues, then there is likely no reason for you to be concerned. However, there’s a simple list of points you can check yourself to ensure you’re not at risk. If you’re not sure about any of the questions or how to answer them, speak to a professional. If you’re in the process of looking into cavity wall insulation, this is also an excellent checklist to go through beforehand. 

  1. Is your house exposed to severe levels of rain that is wind-driven? See zones three and four in the map.
  2. Is your house in an unsheltered position (e.g. with no other houses, structures or natural objects blocking the wind and rain).
  3. Are your external walls in poor condition (e.g. crumbling brickwork or mortar).
  4. Ensure you use a CIGA-approved installer See the below paragraph for more information.

If you comfortably believe you do not suffer from any of the listed points, the next step is finding or ensuring your cavity wall installer is accredited by CIGA. This means you’re unlikely to fall foul of damp issues as it is an independent body that guarantees your cavity walls for 25 years. To ensure you’re not being fooled by a rogue trader, you can check the CIGA website for an up to date list of members.

What causes damp issues associated with cavity wall insulation?

The main reason is a poor installation process and a lack of checks beforehand to ensure there will be no issues. Cavity wall insulation fills the gaps between your bricks and ensures your home stays warm. However, if a gap is left, the cold air will remain there. These spaces are where the moisture builds up and over time it will move through your walls, potentially also bringing black mould with it.

Furthermore, the damp will also spread through the cavity wall insulation, which means it is likely to cool and draw heat from your property. The result of this is it does the complete opposite of what it is supposed to do – keep heat in your home.

Closing Notes:

By using a CIGA-approved installer, there is very little chance of you falling foul of the issues described in this article. We are CIGA-approved and if you are interested in learning more on how cavity wall insulation can help you reduce your energy bills and keep your house warm, please contact us.

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