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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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    • CommentAuthordelprado
    • CommentTimeAug 8th 2017
     
    As I don't trust any builder. I need to understand how this is done properly prior to window fitting. Can anyone help?

    Thanks
    • CommentAuthorDarylP
    • CommentTimeAug 8th 2017
     
    cavity closers.....?:cool::wink:
    • CommentAuthordelprado
    • CommentTimeAug 8th 2017
     
    But there are about hundred different designs! And I can't seem to work out how they stop moisture tracking across, or being a thermal bridge
    • CommentAuthortony
    • CommentTimeAug 8th 2017
     
    This is how I did it http://www.tonyshouse.readinguk.org/tony205.jpg

    I hate cavity closers as the tend to cause a vertical crash where they join the blocks.

    I never understood vertical dpc at the reveal opening after blockwork teturnsvwent out of fashion, why doesn't the whole wall need one?
    • CommentAuthordelprado
    • CommentTimeAug 9th 2017
     
    What is PUR in your diagram Tony?
  1.  
    Polyurethane
    • CommentAuthorDarylP
    • CommentTimeAug 9th 2017
     
    @delprado, sorry, trying to be 'funny'... bad mistake:shamed:

    They tend to be plastic, filled with foam or mineral wool.
    Thus they form a very small thermal bridge, and prevent moisture tracking across the cavity.
    Kingspan list a range for different cavity widths IIRC?
    Good luck:smile:
    • CommentAuthorgravelld
    • CommentTimeAug 9th 2017
     
    If a cavity is revealed, say when replacing windows, and there's no cavity closer, is it a BC requirement to add one?
    • CommentAuthortony
    • CommentTimeAug 9th 2017
     
    Good question, probably not but for a new window opening a plan should be drawn so something will have to be shown.

    For upgrading danp window reveals, this friend did a really nice job, documented http://readinguk.org/draughtbusters/basic-techniques/walls-and-windows/
    • CommentAuthorgravelld
    • CommentTimeAug 9th 2017
     
    Great work on that site and the overall project tony.
    • CommentAuthordelprado
    • CommentTime7 days ago
     
    For a bay can anyone help me out? Not really sure how to do it - especially since there is a timing issue of doing this cavity work then getting windows replaced. It seems to me I can't do a proper job of the cavity till the window is out?

    https://s28.postimg.org/drxfbkiml/IMG_0368.jpg
    https://s28.postimg.org/c1eea313h/IMG_0369.jpg
    • CommentAuthortony
    • CommentTime7 days ago
     
    Do what you can now, clean that ugly crack, I would wet it, fill it with non expanding foam, next day cut to a nice flat surface.

    After window is in like the reveal with some thinnish thermal board that will also go over stud work, insulate the studworh right down to under the floor, down to and to any window above/below
    • CommentAuthordelprado
    • CommentTime6 days ago
     
    Ignoring the studs under the window, what about the outer leaf of brickwork? If I just plaster over the top that is going to be a thermal bridge?
    • CommentAuthortony
    • CommentTime6 days ago
     
    yes and it will crack very quickly and badly (like falling out bits)
    • CommentAuthordelprado
    • CommentTime3 days ago
     
    So what do I do! :)
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