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Old 08-03-2010, 02:01 PM   #1
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Attic floor thickness?


I want to put some plywood in the attic above my garage to store some seasonal items. The 2 x 4 trusses are either 20" or 24" on center. I can't recall which. What thickness plywood should I lay down? Will OSB work, or do I need to use plywood?

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Old 08-03-2010, 02:03 PM   #2
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Attic floor thickness?


Are you going to be walking/crawling on this plywood, or just laying seasonal items on it from the access hole?

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Old 08-03-2010, 02:09 PM   #3
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Attic floor thickness?


I'll be walking around. I went up there to install a bunch of outlets and lights in the garage. Walking on the joists got a little old. I won't be going up there very much anymore. I just want to be able to put some items up there and move around a little.
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Old 08-03-2010, 03:42 PM   #4
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Attic floor thickness?


I'd put 1x shelving grade boards up there with gaps between. They're stiffer. You just need enough to walk on.

If you use plywood then fasten it to every rafter to give some stiffness to the surface. Here's a link from DH
http://g-lumber.com/pdf/APA_Plywood_...cification.pdf

For the dead load, figure your added wood at 35 # per cu. ft.

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Old 08-03-2010, 04:59 PM   #5
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Attic floor thickness?


Very few attic trusses are designed for using the attic for storage. Keep only a few light things up there at most.
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Old 08-03-2010, 05:35 PM   #6
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Attic floor thickness?


http://www.tricountytruss.com/CodeChanges.aspx

Be safe, Gary

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