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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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General: birdmouth joint for flatish roof?

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  1.  
    • CommentAuthorthebeacon
    • CommentTimeDec 22nd 2022
     
    Hello,

    I am currently drawing the design for my garden room in Sketchup. The roof spans 3500mm and has a fall of 270mm from the front wall to the back wall. This gives me a 4.4 degrees (092:12) roof pitch. It means the roof is slightly steeper pitched than a flat roof.

    My question is, should I plan to cut in birdsmouth joints on the rafters or cut the wall joists at the angle? I plan to use truss clips on the rafters. Just wondering what the best practice would be in this situation.


    Thanks in advance
    •  
      CommentAuthorfostertom
    • CommentTimeDec 22nd 2022 edited
     
    Generally aim to form a horizontal bearing, so no tendency for the rafter to want to slide down a slope, only resisted by nails/screws in shear - admittedly too shallow pitch to matter, in this case.
    • CommentAuthorthebeacon
    • CommentTimeDec 23rd 2022
     
    Brilliant thank you for your reply
    • CommentAuthorCoverley
    • CommentTimeDec 28th 2022
     
    Does that fall equate to 8mm over a 100 stud/wallplate? I think it would be good to use a wedge if you don't birdsmouth?
    • CommentAuthorcjard
    • CommentTimeDec 29th 2022
     
    Agree with Tom; use sketch up to calc your dimensions for a minimal birdsmouth (solid tools; group your joist, group your wall plate then use the wall plate as a cutting tool to cut the joist. If you don't have pro/solid tools, just use intersect faces, then clean up)

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