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jfrost

10:51AM | 09/16/02
Member Since: 09/15/02
3 lifetime posts
Bvtools
I'm starting a project to turn unfinished space over a garage into a closet. The joists over the garage (unfinished space) are 2x6 with a span of 14 feet, 16 inch oc. The second floor joists under the finished areas are 2x12's. My question is: Can I put another 2x6 on top of the existing 2x6 joists with side bracing to achieve the proper strength for the span? Or, should I replace/sister all of the 2x6 joists with 2x12's?

Getting 14' 2x12's up there will be difficult so suggestions/ideas are very welcome.

Thanks to anyone that can help me out.
Jim

rpxlpx

03:38AM | 09/17/02
Member Since: 03/13/00
1675 lifetime posts
I don't know the answer but will point out that adding two 2x6's together will not get you exactly the same total size as one 2x12.

GlennG

02:54PM | 09/17/02
For the type of room you are planning and span of 14’ @ 16” OC a 2x10 would do the job. A 2x10 made from Douglas fir #2 grade will span 14’ 3” with a live load of 40 lbs./sq. ft. and a dead load of 20 lbs./sq. ft.

Using 2x8s of #2 grade southern yellow pine @ 12” OC will achieve a span of 14’ 2” using the same load.

Therefore if you were to sister a 2x8 made of #2 southern pine with the existing 2x6 and nail them together using two rows of 10d cc nails in a staggered pattern every 8”-10” I believe you will meet the requirements for the 14’ span. While the 2x8s will be only 16” OC the added strength of the 2x6s should make up the difference needed to achieve the span.

The loads I have used for these calculations should be more than sufficient for what you intend.

Glenn


[This message has been edited by GlennG (edited September 17, 2002).]

[This message has been edited by GlennG (edited September 18, 2002).]

jfrost

06:09PM | 09/19/02
Member Since: 09/15/02
3 lifetime posts
Glenn,

Thanks for your help! I like the 2x8 idea because they're a heck of a lot lighter than a 2x12.

Thanks again,
Jim


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