Plywood sub floor - Nails or Screws


Old 05-19-08, 10:18 PM
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Plywood sub floor - Nails or Screws

What type of fastener should I use for installing 3/4" plywood on top of floor joists? Should I use screws or nails? What type? What length? And what spacing?

I plan to use 2" deck screws and some sub floor glue with 5 screws per middle joist and 8 screws one the plywood ends. Is there any problem with that?
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Old 05-20-08, 07:55 PM
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I'm no pro but that sounds right on target. I would use screws; they don't work loose. Might check out APA site for more technical info:
also; a lot of info at:
Old 05-21-08, 05:08 AM
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If you use a good subfloor adhesive, it won't really matter about the fastener, as the adhesive will be your major holding agent. I use galvanized ring shank #8 nails spaced about every 8 inches, but using the screws will work just fine, just a lot more work. It is your project, so it is your call. Good luck with the install and let us know if we can help further.
Old 08-05-08, 10:31 AM
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Subfloor screws

Most of the quality home builders in my area use Grabber Screws and a Superdrive collated screw gun for a speedy installation. The C8175L3YZ is a #8 by 1-3/4" zinc coated fastener and is the screw of choice. Along with some GSFA subfloor adheasive you will have no squeaks. Go to www.grabberman for more info.
Old 07-02-09, 10:25 AM
Join Date: Jul 2009
Location: Iowa
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Question Replacement of 3/8-inch particle board

In preparation of install tile in my house I have discovered that the subfloor consists of two layers -- 3/8-inch bc plywood and 3/8-inch particle board, 3/4-inch total depth. In replacing the particle board can I use 3/8-inch bc plywood, glued and screwed to the first layer --- would like to retain same depth of subfloor? The floor joists are 2/10 on 12-inch centers with every third joise doubled.

Thanks in advance
Old 07-02-09, 02:20 PM
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You can use 3/8" plywood glued and screwed to the joisting, not to the original plywood only. And you have to turn the plywood 90 degrees to the original install, starting in the middle on a joist and running outwardly so you are hitting a joist with all the joints. Are you going to be tiling or laying hardwood over this?

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