Lean-to shed roof


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Old 07-17-17, 01:16 PM
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Lean-to shed roof

I'm building a small lean-to shed (4' x 7') and need help with the rafters. Is there a simple or dumbed down calculation that I can use to figure out how to notch the boards correctly to sit flush on the walls? If I measured correctly the rise is 11.75" and the run is 46".
 
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Old 07-17-17, 02:28 PM
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Well, that's pretty much a 3:12 pitch, so if you don't have a speed square, go get one that comes with a manual (Swanson) and learn the instructions... because that is the simple way of doing it.
 
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Old 07-17-17, 03:01 PM
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I like simple. I do have a small speed square but no real clue how to use it properly, so getting instructions on how to use it is a really great idea. Maybe Swanson or others have something available online. Thanks for the help!
 
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Old 07-17-17, 03:15 PM
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It isn't the Swanson blue book but maybe this link will help.
 
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Old 07-17-17, 03:28 PM
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If that's the Irwin manual I was just reading it. Re-worked the numbers and yep it's a 3:12 pitch. The table calls for a 49.5" rafter length, does it matter if I extend that out front another 5 or 6" for aesthetics? Shouldn't affect the angles or seat cuts, correct?
 
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Old 07-17-17, 03:32 PM
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Correct. Overhang is all beyond the seat cut.
 
 

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