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Green Building Bible, Fourth Edition
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Housing - New Build: Dormer Details

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  1.  
    • CommentAuthorStuart112
    • CommentTimeJul 18th 2016
     
    I have searched the forum but cannot find anything. I am building a new house which has one small dormer window. Does anybody have any detailing around a dormer window to minimise thermal bridging, including any lead/flashing detailing. Everything I come across has the lead continuing down the side of the window frame, which causes a severe thermal bridge in my eyes. Thanks
    • CommentAuthortony
    • CommentTimeJul 18th 2016
     
    Add 300mm of insulation under the lead, easy!

    Even the structure causes thermal bridging
    • CommentAuthorStuart112
    • CommentTimeJul 19th 2016
     
    Thanks Tony,

    appreciate your comments and get where you are coming from. I should have perhaps been a little clearer in my question.

    Please see attached detail of side cheek to dormer. The insertion of lead to create the weatherproofing creates a massive thermal bridge as the heat loss path is straight through the leadwork and not through the insulation as in a normal window detail.

    I am perhaps missing something here but where I live and the height above sea level of the build puts it in the very severe wind driven rain exposure zone therefore quite critical to get the weatherproofing detail correct.

    Thanks
    • CommentAuthortony
    • CommentTimeJul 19th 2016
     
    very odd detail, what is the lead doing? I would seal the cover cladding to the window ideally with something thin and water resistant behind the join if UPVC ot Ali window then upvc or ali trim and upvc or ali cover cladding.

    then omit bracket and fix window to horizontal rails.

    sill should be slightly wider than window with European type end caps and cover cladding sits on top of that sealed behind, sill should sit on welted lead 35mm under.

    Looks like nicely insulated but tricky to do.
  5.  
    Agree with Tony. The leads seems superfluous in that position. You don't need it. Tight fits, overlaps, and sealant if required
    • CommentAuthortony
    • CommentTimeJul 19th 2016 edited
     
    I have fitted sill, side covers and head, slated up to head height and then fitted window, sides screwed to frame

    In your case you might need lead soakers to the slates that tuck behind the front angle of the cladding cover, we never did exposed but there could be ingress in your case, be aware and build fail safe.
    • CommentAuthorStuart112
    • CommentTimeJul 19th 2016
     
    Thanks

    Appreciate the guidance

    Stuart

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