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Old 01-18-2012, 01:58 PM   #1
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Maximum shed rafter length span


So, I am attempting to build a cabin with a shed-style roof.
I intend to build the cabin to a size of 16'x 36'.

The walls are 2x6 with a double top plate of course, the floor 2x8 with 3/4 inch plywood sheathing, and the rafters shall be 2x10, to allow for r-35 insulation.

What I need to know is what is the maximum length the 2x10 rafter can span without the need for support mid-span.

So, the question is: can a shed style roof with 2x10 rafters span the 16 foot wide structure without the need for any supports in the middle?

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Old 01-18-2012, 02:03 PM   #2
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Maximum shed rafter length span


Depends on pitch of roof and roof/snow load.

Make sure you have air flow above your insulation in the roof. Has to come in the bottom and go out the top.

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Old 01-18-2012, 02:06 PM   #3
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Maximum shed rafter length span


the pitch is 3-12, and the roof load should be 40 psf
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Old 01-18-2012, 02:16 PM   #4
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Maximum shed rafter length span


Here is a simplified span table. http://www.wclib.org/pdfs/SimpSpanTbls.pdf
I would go with no less then #2 fir, prefer #1 fir. Watch out for knots that might cause a weak point.
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Old 01-18-2012, 06:44 PM   #5
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Maximum shed rafter length span


I would think you could span that far with 2x10 but you should see what local codes call for.
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Old 01-18-2012, 07:37 PM   #6
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Maximum shed rafter length span


Try THIS link.

Andy.

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