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Rafter size for shed

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Jim M (RI)

05-19-2003 11:32:35




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I am building a shed 28' long and 12' wide. I am going to put a slope roof with a 3"/ft slope front to rear. Going to space the rafters at 16". What size rafter do I need to support roof/snow load. I was thinking 2x10 but want to make sure. Located in Rhode Island. Thanks for any help. Jim




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David - OR

05-19-2003 17:08:04




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 Re: Rafter size for shed in reply to Jim M (RI), 05-19-2003 11:32:35  
Assuming you are spanning the 12 foot direction, 2x8 lumber, #2 and better, of Douglas Fir, Southern Yellow Pine, or the typical Eastern species group (Spruce-Pine-Fir), will be adequate to support up to a 50 pound per square foot live plus dead load.

Ground snow load for extreme Northeast Rhode Island is taken at 30 pounds per square foot in the International Building Codes. Other parts of the state are less.

If there is no finished ceiling and you use the stronger grades of wood (Doug Fir or SYP), and the 12 feet is measured from the outside of the building, you can (just) get away with 2x6 rafters on this spacing.

Disclaimer: I am not a licensed structural engineer and your local building codes may dictate something else.

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Jim M (RI)

05-20-2003 03:54:17




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 Re: Re: Rafter size for shed in reply to David - OR, 05-19-2003 17:08:04  
Dave, Thanks for the post. You are corect - the span the rafters will cross is the 12 dimension and yes in fact the 12 is the outside measurement. Since I am doing it myself, I think I will use the 2x8's. We are near the coast in southern RI, but I would rather be safe that sorry. Thanks again, and have a wonderful day. Jim



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