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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - New Build: Load on hip rafter

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  1.  
    • CommentAuthortony
    • CommentTimeNov 16th 2016
     
    Here is a good question -- is there a load on a hip rafter?

    Discuss
    • CommentAuthorDarylP
    • CommentTimeNov 16th 2016
     
    gravity ? :cool:
    •  
      CommentAuthorjoe90
    • CommentTimeNov 16th 2016
     
    Yes, if the hip rafter was to small or compromised the roof could fail. Like links in a chain it's part of a complete package tying all parts together. I have argued successfully in the past about not having a beam for a ridge as the loading either side is equal therefore only there to tie the roof together.
    •  
      CommentAuthorfostertom
    • CommentTimeNov 16th 2016 edited
     
    For both ridges and hips, depends whether or not the rafters are acting as struts leaning against ea other at top, which won't effectively shorten, which requires them to be immovably fixed (not the slightest spreading) at bottom, as well as being pretty fat in both section dimensions, height and width, against rotation/buckling. That's a tall order, for the life of a timber member, so wiser to ignore that theoretical action, treat the rafters as simply supported beams that require vertical support at both ends.
    • CommentAuthortony
    • CommentTimeNov 16th 2016
     
    It sounds like you are saying that all ridges and hips have to be load bearing , i.e. They need to be beams.

    In the old days (mid to early last century) hips (and ridges) often used to be an inch wide and not very deep e.g. 6 X 1 and they are still there today.
    • CommentAuthorringi
    • CommentTimeNov 16th 2016
     
    Posted By: tonyIn the old days (mid to early last century) hips (and ridges) often used to be an inch wide and not very deep e.g. 6 X 1 and they are still there today.


    We also see the ones that have not given way....
    •  
      CommentAuthorfostertom
    • CommentTimeNov 16th 2016
     
    Those kinds of roofs had rafter ties at both ceiling and mid height level, purlins as beams and props off internal partitions. If you've got all that then yes, simple nailing strips are fine.
  8.  
    Posted By: joe90I have argued successfully in the past about not having a beam for a ridge as the loading either side is equal therefore only there to tie the roof together.

    Typical roof here has no ridge beam, has rafters of 100mm x 150mm at 900mm centers, opposing rafters joined with cross halving and nailed. Bottom end fixed to wall plate (also 100x150) by birds mouth and nails and the wall plate is fixed to a concrete ring beam. Concrete ring beams are standard even on new build, typically one at first floor level (tying in concrete beam and block first floor) and one at roof level
    • CommentAuthorringi
    • CommentTimeNov 17th 2016
     
    I thought "birds mouth" where too hard for the building trade these days.....
  10.  
    Posted By: ringiI thought "birds mouth" where too hard for the building trade these days.....

    Not here - usual roofing tools - a chain saw and a hammer

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