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Old 04-23-2009, 02:43 PM   #1
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shed floor plywood layout?


I am building an 8 x 12 shed. I am planning to have 2x6 joists 16" oc. I am using 3/4" tongue & groove plywood for the floor.

Is there any reason to lay the plywood in one orientation or the other?

I could lay 3 sheets with the 8' dimension of the sheet matching the 8' dimension of the shed. Or, I could turn them 90 degrees, which would require cutting the sheets.

Drawing:


(not to scale)

Thanks!

-Ryan

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Old 04-23-2009, 03:40 PM   #2
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shed floor plywood layout?


the second option is better i believe for sturdiness, that's why all plywood decks/floors are installed that way
also make sure the 3/4 T&G ply is glued down, it helps

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Old 04-23-2009, 06:09 PM   #3
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shed floor plywood layout?


As konstruction said: perpendicular to the joists. Try to span minimum 1 middle joist (32" wide cut), with the smallest piece. Be safe, GBAR
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Old 04-23-2009, 07:14 PM   #4
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shed floor plywood layout?


Thanks, I knew it was typically done that was but I wasn't sure if there was a reason.
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Old 04-24-2009, 11:20 AM   #5
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shed floor plywood layout?


Quote:
Originally Posted by flamtap View Post
Thanks, I knew it was typically done that was but I wasn't sure if there was a reason.
There really is a reason. Well, a couple of them, actually.

1. - Cheaper plywoods are laminated in such a way that there is more strength against breakage in the longer direction. More expensive plywood doesn't seem to have this problem. Flooring plywood is the cheaper stuff.

2. - Perpendicular spanning of floor joists helps to negate the varying relative heights of all the top surfaces of the joists. They do not often create a flat, level plane upon which to place flooring. If your joint in your first drawing happened to fall on a joist that was either high (or low) in comparison to all the others, you would have a very pronounced rise (or a dip) in that area of your floor. Going crosswise to the joists reduces the prominence of such a deviation.
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Last edited by Willie T; 04-24-2009 at 11:22 AM.
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