Larry,
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!
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Robert Braddock AIA
Principal
Red House Architects, PLLC
Arlington VA
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Original Message:
Sent: 08-19-2020 18:14
From: Lawrence Slawson
Subject: Gambrel roof framing details
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