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  • Retro fitted Cavity Wall Insulation

    Question: We are considering purchasing a house which has had CWI injected into it. I've read a great deal around it and not much of it is positive! The CWI was installed in 2007 and the exterior and interior walls all seem fine - no cracks, no damp patches, no damp smell, no mould, no ruined paint work etc. House faces east-west and is on an estate, mid terraced, surrounded by trees and is quite low down and sheltered. It is in Cornwall so rain and wind is part and parcel. Whats your opinion of Inj.CWI?

    Answer: Thank you for your query.

    You have obviously done plenty of research and correctly identified that exposure to wind driven rain as an important element where CWI has failed.  It is important that the cavity remains unbreeched.

    If it has been installed successfully for ten years with no indications of failure, then that is your best clue.
    You might also look at other houses in the street and enquire if they have had CWI installed and have any issues.
    For reassurance you can contact the CIGA to see if your installation came with a guarantee and be sure your solicitor obtains any paperwork from the vendors.

    You might also check if it was installed by a BBA approved installer
    Of course, the best advice is to have a proper building survey by an RICS qualified surveyor in your local area. Find one at  A Building Survey is a bespoke report and you can ask your surveyor to pay particular attention to the CWI.
    Otherwise, where properly installed and unbreeched CWI is a benefit to the energy efficiency of your home.  I hope this is of assistance for you.

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