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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Window and doors in EWI

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    Wow, I go away for a few days and come back to all this information. Really interesting conversations going on here.

    Is there any reason why, to support the window/door, it couldn’t sit on a 4x2 or 4x3 CLS timber plinth that is screwed back into the existing cavity wall leaf, with some steel brackets up the sides?

    Air tightness tape etc. all round and then encapsulate it all in the EWI, which in my case will be 200mm thick.

    Wouldn’t this remove all the thermal bridging while making it very simple to deploy? Maybe I’m missing something or not appreciating the weight of the windows and doors sitting on the timber.

    I also need to look at ordering windows, is Russel Tech Timbre still good value for money as I had a quote from 21degrees and can’t really afford them - more money was spent in the ground and rebuilding some walls ect than anticipated.
    • CommentAuthorborpin
    • CommentTime2 hours ago
     
    The window box does two things - allows you to secure the window into the insulation layer (cantilever) and also improves the ability to seal the window for airtightness.

    Windows are often fixed using metal plates fixed to the window then fixed back to the inner leaf. This offers numerous routes for air ingress.

    The box is deeper than the window itself, ideally comes back inside to the depth of the reveal.
    •  
      CommentAuthordjh
    • CommentTime43 minutes ago
     
    Posted By: englishjohnIs there any reason why, to support the window/door, it couldn’t sit on a 4x2 or 4x3 CLS timber plinth that is screwed back into the existing cavity wall leaf, with some steel brackets up the sides?
    The steel brackets are a large thermal bridge; and a timber plinth is a smaller thermal bridge. A ply box does away with both of them.

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