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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    Hello all,

    After playing around with a borescope camera we’ve found a couple of small (~1cm wide) gaps beneath our door sills that are causing a noticeable cold bridge at the threshold edges.

    I’m wondering if anyone has tips for a low-expansion squirty foam with a half-decent lambda value? The caveat being that it will also need to play nicely with the EPS on either side.

    Reading older threads it looks like PU-based foams might be best, but all suggestions are welcome.
    • CommentAuthorjfb
    • CommentTimeFeb 24th 2020
    • CommentAuthorgoodevans
    • CommentTimeFeb 24th 2020
    Soudal also do a foam specifically for filling in between window and door frames. They don't seem to be able to decide what to call it - somtimes its 'SWS' somtimes its Door and Window, somtimes its Flexifoam or a combination of any of the above.

    It comes in a pale blue colour and it remains flexible after curing so in theory it should stay stuck to both surfaces even if there is seasonal movement.
    Thanks both.

    So it sounds like PU is definitely the way forward.

    I've just found one that says SWS, Door & Window and Flexifoam on the same bottle, so looks like it's definitely the right stuff!
    • CommentAuthordereke
    • CommentTimeFeb 25th 2020
    It might pay to make a mockup of the gap before trying out the foams so you can get a feel for how much to squirt.

    Also get a gun you have much better control of how much foam comes out.
    Thanks dereke, I've just bought a can of the sws stuff and a can of gun-cleaner since my old squirty gun is a bit worse for wear. Having previously made the mistake of filling a quart of foam into a pint pot of space, I'm determined to take things slowly this time and build up in layers, but the mock-up is a good idea too.
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