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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorgyrogear
    • CommentTimeApr 20th 2017
    "Thousands of homes in the North West of England are having cavity wall insulation removed at the cost of millions of pounds because residents claim it has led to damp, mould and condensation. "


    Having a chat with my EWI man and BCO yesterday, they are of the opinion that existing CWI needs to be checked carefully, and that at present regulation of who can do it does not control who actually does it.

    • CommentTimeApr 21st 2017
    I'm curious what the actual problems are. Has anybody come across any explainers or reports etc?
    • CommentAuthorDarylP
    • CommentTimeApr 21st 2017
    CWI badly installed (not contiguous), and in dwellings subject to wind-driven rain making them unsuitable for that type of CWI.....:cry:
    • CommentAuthortony
    • CommentTimeApr 21st 2017
    Damp mould and condensation can result from a serindipidus effect of CWI as it improves air tightness and draughty homes tend not to suffer from condensation.

    It is very unfair to pin the problem on CWI

    The video shows rubble in the cavity and condensation above the skirting.
    • CommentAuthorringi
    • CommentTimeApr 21st 2017 edited
    One of the homes look like condensation to me. But if there is rubble in the cavity that would make part of the inside walls a lot colder then others. The cavity should have been inspected for rubble before the insulation was installed.....
    • CommentAuthortony
    • CommentTimeApr 21st 2017
    Yes but with big grants and subsidies and poor quality control with profits at stake not a big surprise.
    • CommentAuthorringi
    • CommentTimeApr 21st 2017
    So far it only seems to be 1% or 2% of homes with cavity insulation that are having issues unless a lot of problems are not being reported.
    • CommentAuthorCWatters
    • CommentTimeApr 22nd 2017
    <blockquote><cite>Posted By: djh</cite>I'm curious what the actual problems are. Has anybody come across any explainers or reports etc?</blockquote>

    Some bricks can be remarkably porous. I once filled a bucket with some and then topped it up with water. The bricks fizzed and popped and absorbed the lot. If your house is in an exposed location its not hard to believe rain water can penetrate the outer leaf and then saturate the cavity wall insulation.

    the last big push with CWI seemed to be mainly using EPS balls rather than blown rockwool or that nasty foam white fluff stuff.
    I'd imagine they would reduce the risk due to they fact they wont hold water.

    I've seen some similar issue re EWI and as Tony points out this may well be related to domestic water vapour control and ventilation
    • CommentAuthorgravelld
    • CommentTimeApr 23rd 2017
    When I was trying to get it done under grant via ECO about four years ago it was all fibre because EPS cost more. Choose to pay the lot myself for EPS in the end.
    • CommentAuthortony
    • CommentTimeApr 25th 2017
    Good move
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