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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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Housing - New Build: Eaves Overhang Question

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  1.  
    • CommentAuthorTriassic
    • CommentTimeNov 26th 2014 edited
     
    I'm building a small timber frame annexe measuring 7800mm by 4800mm (external dimensions of walls). I'm looking at the roof construction and wondering how much the eaves should overhang?

    Any suggestions?
  2.  
    I generally use min 250mm, but could be considerably more. A lot will depend on overall heights and roof-slopes.
  3.  
    • CommentAuthorowlman
    • CommentTimeNov 26th 2014
     
    I generally favour deep soffits. My bungalow is 500mm plus guttering about 630 total. I've just completed a conservatory where I continued that line, the front gable end too.
    • CommentAuthorArchmoco
    • CommentTimeDec 5th 2014
     
    What is the finish of the external walls?
    • CommentAuthorJeff B
    • CommentTimeDec 5th 2014
     
    Sorry can't answer your question but as I'm contemplating a similar project, would you mind saying whether this project required planning permission or BC approval or both?
    • CommentAuthorGreenfish
    • CommentTimeDec 6th 2014
     
    The thickness of the walls and finishes needs to be taken into account, and also consider the sizes of available soffit materials to minimise waste. The eaves overhang on my trusses looked huge, but soon vanished once the wall thickness was increased by cedar cladding on battons and counter battons. Visible soffit of 250mm (guttering additional), timber supporting it is more than twice that, but it is a personal choice.

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