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Old 05-14-2010, 08:15 AM   #1
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Hey Guys, My first post and I hope it comes out right!

24' X 24' workshop in MS. Concrete Slab. 14' Garage door on front. 2 48" sliding windows on each side. Solid back.

I couldn't get Metal I-beams so I decidec to build my own.

Question: Will double 2" x 6"/ 1/2" OSB divider on 24" centers spanning the 24' length support a small load without sagging. I'm useing typical Kiln dried Whitewood 2 x 6's from our local Lowes.

Thanks

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Old 05-14-2010, 08:20 AM   #2
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Old 05-14-2010, 09:47 AM   #3
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Doubled up 2x6s on 24" O/C is really just 2x6s on 12" O/C.

Span tables for standard No. 2 graded southern pine indicates the maximum span for 2x6 on 12" O/C is 19'6", and that's just for the absolute minimum for ceiling joists. If you want to actually do anthing with the space above, you need much larger wood.

http://www.southernpine.com/spantables.shtml
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Old 05-14-2010, 10:19 AM   #4
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I spent 8 months in MS after Hurricanes Katrina and Rita inspecting damaged homes. Back then, there was no building code for most of MS, and the one they had was rarely enforced. Net result, half the houses I inspected had been destroyed down to the foundations.

Fast forward to the present, there is a building code. You are supposed to get a permit. Your local code enforcement official will help you to understand what the requirements are for the particular type of structure you are building. You need to consider critical design issues such as hurricane clips for the rafters, plywood bracing for the frame, adequacy of bolts for the foundation. The span tables are just the start. I suggest you purchase a copy of the building code, review your plans for the project against the code, then talk to the building official about specifics for your local area.
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Old 05-14-2010, 10:45 AM   #5
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Originally Posted by Rking View Post
Hey Guys, My first post and I hope it comes out right!

24' X 24' workshop in MS. Concrete Slab. 14' Garage door on front. 2 48" sliding windows on each side. Solid back.

I couldn't get Metal I-beams so I decidec to build my own.

Question: Will double 2" x 6"/ 1/2" OSB divider on 24" centers spanning the 24' length support a small load without sagging. I'm useing typical Kiln dried Whitewood 2 x 6's from our local Lowes.

Thanks
Doubling the 2by thickness to 4by doubles the stiffness. Doubling the height multiplies the stiffness by 8x.
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Old 05-14-2010, 11:02 AM   #6
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Damn, This site is GOOD! I wasn't expecting a reply, but, I get THREE already. Thanks guys all sounds like some good advise!!!!
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Old 05-14-2010, 11:12 AM   #7
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Old 05-14-2010, 10:50 PM   #8
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There are times to DIY a beam - I did it for some garage attic space.

This is not one of those times. 24' is a pretty good open span. What you need is something called Engineered Lumber - basically a wooden I beam. Lumber yards have access to this, and should be able to tell you exactly what you need.

As an alternative, if you just need storage space over the door area, you could frame in a wall on either side of the door them build a narrower platform - say 16' wide - above that. This could then tie to the outside walls for horizontal stability - you could even deck over the 8' spans there for wall to wall storage space.
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Old 05-16-2010, 08:38 AM   #9
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I'm not sure I've ever seen a 24' 2x6.
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Old 05-16-2010, 12:50 PM   #10
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You can buy them, but they cost nearly as much as two 20'ers!

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