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Old 06-15-2010, 11:54 AM   #1
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


PT 1x6" boards would actually be cheaper than using 3/4" T&G plywood... ($142 vs. $220).

Any reason to go with one over the other (other than the 1x6 solution would require a lot more nails)...?

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Old 06-15-2010, 12:49 PM   #2
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


1x6 gives you a stiffer floor.

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Old 06-15-2010, 12:54 PM   #3
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


I would guess that if you have somewhat more than 16 inch joist spacing (like 24 inch), you would get noticeable sag of individual boards depending on how weight of stored items is distributed.
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Old 06-15-2010, 12:57 PM   #4
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


Thanks guys... floor joists are 2x6 16" OC... guess I'll just stick with the ply since it's easier to install and provides more structural rigidity.
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Old 06-15-2010, 01:43 PM   #5
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


can you get 5/4 PT decking boards for a similar price. a little added thickness and the 1x6 will have "sharp" edges.

I think the T&G would be better than the 1x6s.
I'm not convinced that 1x6 would be stiffer than 3/4 t&g because when you step onto the center of the span, you will often only be putting weight on a single board, and 1 weak spot will make a big difference.
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Old 06-15-2010, 01:56 PM   #6
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


Quote:
Originally Posted by forresth View Post
I'm not convinced that 1x6 would be stiffer than 3/4 t&g because when you step onto the center of the span, you will often only be putting weight on a single board, and 1 weak spot will make a big difference.
But only 3 plies out of 5 are going in the 'right' direction, so you have an effective thickness of 3/5ths of 3/4", at best.

As I requested, some 'wood people' sent me a paper some time ago on the stiffness of what they call panels. I knew someday this question would come up again. Maybe I can locate it.
The 2000 IRC had a few lines talking about this regarding the stiffness of subfloors.
The formulas for joists/beams do not apply, but I've seen a formula for correcting for knots in joists.

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Old 06-15-2010, 03:19 PM   #7
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Shed floor: 1x6" PT lumber vs. 3/4 T&G plywood?


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Originally Posted by Yoyizit View Post
But only 3 plies out of 5 are going in the 'right' direction, so you have an effective thickness of 3/5ths of 3/4", at best.
even the "filler" has a big effect on strength by spacing the load bearing pannel out. they act like the web of an I beam.

The OP is also refering to a complete floor, not a subfloor. that makes a difference too.

as far as the effect of weakspots. we've got 1 deck that has 2x4s for planking. trust me, a weak spot really matters in a floor like the OP is describing.

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