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    • CommentAuthordelprado
    • CommentTimeJan 10th 2017
    I need something for an area too small to get a parge coat in. What would you recommend?

    • CommentTimeJan 10th 2017 edited
    There are various foams sold as airtight. Soudal do one that got good reviews. The most important point is that the foam remains flexible after it cures so it can absorb movement without losing its bond. Good bonding is also important of course and low-expansion makes it easier to manage. I think Illbruck do one as well. Ah yes, here we go:



    There are probably others.

    edit: forgot to say - I used both of those successfully.
    • CommentAuthorgyrogear
    • CommentTimeJan 10th 2017 edited
    my (window) installers used this stuff...


    • CommentAuthorgravelld
    • CommentTimeJan 10th 2017
    Everbuild Thermofoam has air permeability measurements, how "airtight" you interpret them as is up to you...

    IME it's as much about the installation as the foam itself, others can probably advise better but you want a good adhesive seal all around the hole you are filling.
    • CommentAuthorcjard
    • CommentTimeJan 10th 2017
    • CommentAuthorringi
    • CommentTimeJan 10th 2017
    It also depends how deep the hole is, I would trust 100mm thickness of foam a lot more then 10mm thickness.....

    See also the thread on Blowerproof Liquid Brush.
    • CommentAuthorSimon Still
    • CommentTimeJan 11th 2017 edited
    We used Airstop foam - very different to conventional sprayfoam.


    All their products that we used were good - the Omega liquid was used all over the place. Really useful for waterproofing timber that was temporarily exposed as well as for airtighting. Looks like it's a similar sort of thing ot the Liquid brush mentioned.

    • CommentTimeJan 11th 2017 edited
    Posted by: cjardGravity applied? http://www.cfsnet.co.uk/acatalog/CFS_Catalogue__2_Part_Polyurethane_Foam_Liquid_415.html

    Exactly the sort of stuff you don't want. It sets rigid; no use at all for an airtightness seal.
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