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Gambrel roof framing details

  • 1.  Gambrel roof framing details

    Posted 08-19-2020 06:15 PM
    I could really use some guidance with how to properly frame a gambrel roof for a new house that I am designing. I am old, but this is the first time for me detailing this kind of roof framing design . To maximize views for this coastal home, I am going to have a 3rd floor “habitable attic”. Any guidance would be much-appreciated!

    Larry Slawson - Sent from mobile phone

  • 2.  RE: Gambrel roof framing details

    Posted 08-20-2020 05:37 PM

    I think it would be a really bad idea to give you advice without knowing anything about the dimensions and the loads involved.  You should consult with your structural engineer.  But, if you refer to the attached sketch, I can say that you will have a much easier time if you include bearing walls where I've shown them dashed in.  It's certainly possible to frame the 3rd floor and roof without them, but it's just a lot more difficult.  You might consider avoiding the whole detailing problem and see if you can order roof trusses that form the entire gambrel, like the second sketch.  The truss manufacturer will engineer the whole thing, following the dimensional outline you provide.

    Best wishes for a successful project!

    Robert Braddock AIA
    Red House Architects, PLLC
    Arlington VA