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Old 02-18-2012, 06:21 AM   #1
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Screws or nails in dbl layer of OSB


Hello, I have a OSB plywood floor in my attic and its only 7/16" thick so Im adding another 7/16" thick layer on top to thicken it up and make it feel like Im not going to fall threw. Anyway, I already started screwing it together with coarse 1-1/4" drywall screws and some screws hold some don't they spin or strip out. My question is would fine thread drywall screws work better or would a certain kind of nail?

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Chad

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Old 02-18-2012, 06:54 AM   #2
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Screws or nails in dbl layer of OSB


Ayuh,.... Just Don't tighten 'em so tight if their strippin' out...

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Old 02-18-2012, 07:11 AM   #3
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Screws or nails in dbl layer of OSB


Pain in the butt but if you predrill the top piece it will pull the two pieces together instead trying to push the bottom piece away as it first grabs.

To keep it from stripping try using an adapter on your drill that's made for setting drywall screws.
Is this attic designed to hold all that extra weight? If not there's going to be a lot drywall damage down stairs over time.
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Old 02-18-2012, 07:31 AM   #4
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Screws or nails in dbl layer of OSB


Hope you slapping some construction adhesive between those sheets. It will sure help with the bonding.

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Old 02-18-2012, 07:38 AM   #5
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Screws or nails in dbl layer of OSB


I agree, use construction adhesive between layers. Also, longer screws ran through into joists will solve stripping problem.
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Old 02-18-2012, 10:03 AM   #6
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Screws or nails in dbl layer of OSB


It will support the weight and thank you I will have to get my drywall gun out and some adhesive... Liquid nail

Thanks,
Chad
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Old 02-18-2012, 01:38 PM   #7
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Screws or nails in dbl layer of OSB


Your 6ga, 1 1/4" drywall screws are too long, too skinny, and you're running them in too fast. Get some 8ga, 1" deck screws and install at low speed and all your problems will disappear. Yes on the adhesive.

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