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What kind of screw should I use to screw down a plywood subfloor to the joists?

What kind of screw should I use to screw down a plywood subfloor to the joists?


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Old 07-23-14, 08:27 PM
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What kind of screw should I use to screw down a plywood subfloor to the joists?

The ply is 3/4". Ive gotten all sorts of recommendations. Someone told me not to use deck screws because the top of the shank is screw. Someone told me it has to be 3". Someone told be 1-3/4". Someone told me #8. Someone told me #10. Etc etc. Thoughts? Thanks!
 
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Old 07-23-14, 08:33 PM
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The standard answer should be #8 x 2" along with subfloor adhesive.
 
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Old 07-24-14, 05:07 AM
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This is the first layer directly on the joists, correct? Any second layer will not be glued and will not be screwed to the joists, but in the field between the joists, using the same 2" decking screws. I recommend torx head screws. Less cam out and drivability.
 
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Old 07-24-14, 06:35 AM
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Torx screws are good, and depending on what you find they may be #9 or #10, so that might explain why you got some different answers.
 
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Old 07-25-14, 03:17 PM
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Okie dokie, so 2" screws? No bigger?

Additionally, are decking screws ok? I was told that since they were not threaded to the top of the shank they're not as good for what I need them for. Or something.

Thanks!
 
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Old 07-25-14, 03:30 PM
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By not having thread all the way to the top they will tend to pull the two plies together. Besides, I believe 2" screws are threaded all the way.
 
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Old 07-25-14, 03:51 PM
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None of the 2" decking screws i saw had a fully threaded shank. So you're telling me that a partially threaded shank would be best for my situation? Thanks!
 
 

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