What Size Ceiling Joist Do I Need? - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 03-13-2013, 06:53 PM   #1
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What size ceiling joist do I need?

I have a room with a span of 15' I want to have storage in the attic what is the minimun size ceiling joist I can get by with that will pass state code for nc?


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Old 03-13-2013, 08:19 PM   #2
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Simplest would be to go in and have a chat with your local building inspector. They will know exactly what building code applies.


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Old 03-13-2013, 08:21 PM   #3
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this is the 2012 North Carolina Residential Building Code. Select the species and grade of lumber you plan to use and the live load for your attic and check out the span tables.

http://ecodes.biz/ecodes_support/fre...C_Res_2012.pdf this will provide you with the size ceiling joist you need.

Good luck!

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Old 03-13-2013, 08:40 PM   #4
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15` span., id say atleast a 2x10 if not 2x12
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Old 03-13-2013, 09:15 PM   #5
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Depends on what you are going to store up there. I would not go under 2 x 8's 16 OC regardless of what that code says.
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