Question about Stanley 46 - 050 10 - 3/4" x 6" Quick Square Adjustable Layout Tool

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Not sure how to find actual length of hip rafters from plumb cut at ridge to birdsmouth at wallplate.I have 2 stanley quick squares but have misplaced the little instruction books.I would appreciate your help in this matter. P.S. The same problem exists for valley rafters.

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Use Pythagorus. Measure the horizontal length from the plumb ridge cut to the position where the horizontal birds mouth touches the top plate on the wall closest to the ridge. This point should be 1 1/2" in from the outside edge of the wall. This is your run.
Now measure the vertical height from the top of your wall plate to the where the bottom of your vertical cut from the rafter will end up on your ridge. This is your rise.
A squared plus B squared equals C squared. Get your calculator out, if the run is 12 feet and the rise is 4 feet, then 12 squared (144) + 4 squared (16) equals 160. The square root of 160 is 12.65 ft. or 12 feet 7.79" long. There are other ways, but this is most accurate. Make sure your ridge is parallel to you wall.

Posted on Nov 06, 2009

  • stefanm597 Nov 06, 2009

    Good Morning, I apologize about the post last night. You said hip rafter and I gave info for a common rafter. You described a common rafter from wall plate to ridge face, a hip is used on cottage style roofs and goes from the corner to the ridge, the hip rafters then go from the wall plate to this hip, each one getting shorter.
    You probably don't have your ridge up yet so the previous post won't help. Send me more info or you wall dimensions, which way your rafters are going and the pitch and I can send answers back. If you know how to do CAD drafting you may download for free 2D drafting from Solid Edge Origin and draw it out yourself.
    Please check with your local building code to see about rafter spans and size of birdsmouth which is probably 1 1/2", I make it 1 3/4" to be safe.


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