Screwing down subfloor


Hello, I am screwing down some plywood before I begin a tile job. I am uinable to locate the floor joists, as the basement ceiling has been drywalled covering the joists. How am i to screw the sub floor down into the joists if I can't locate them. Is it imperative that I screw into the subfloor? regards Steve
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Steve W. wrote:

It does depend, but I would want it screwed down tight. As I replace carpet and tile I am fixing those squeaks.
Try a good stud finder. It will find them for you.
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Joseph Meehan

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On Apr 17, 5:26 pm, "Steve W." <sjwNOSPAMatripnet.com> wrote:

I think what you mean to ask is "is it imperative that I hit the joists?" the answer to that is NO If you are putting down plywood for tile I'm assuming it is on the floor and not the ceiling. I am also assuming that this is not a NEW sub floor otherwise the joist would be exposed. So that tells me you have a wood floor that you are putting plywood over to do tile on. first of all why plywood and not something like hardibacker? second if you have a sub floor weither you use plywood or hardi you should put coated screws in 12" on center and closer on the joints. http://palmisanoconcrete.com
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The house is 55 years old. I used construction grade plywood because I'm going over top of the original sub floor and it was reccomended to me. Approximately how many screws should I use on 135 sq ft of sub floor? thanks

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On Apr 17, 9:23 pm, "Steve W." <sjwNOSPAMatripnet.com> wrote:

IM is right...you dont' have to hit the existing joist, and keep a 1/8" (or nail width) space around the perimeter
You don't mention it...but don't forget to put a uncoupling layer in between the sub floor and the tile, Schluter's Ditra, cement board, hardi backer bedded in thinset.
Check out the forums over at http://johnbridge.com/vbulletin/index.php...there 's a boat load of information on tiling, prep and the like, and it seems like a pretty friendly place to as tiling questions.
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Procedure for screwing them down? In other words, do holes need to be predrilled & countersunk to prevent that "bump" from forming as you drive a countersink screw into a non-countersunk hole? Or do you sand the 100's of bumps? OP didn't specify what type tile he is setting, but if CVT it will show every irregularity in the plywood,
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On Tue, 17 Apr 2007 20:26:47 -0400, "Steve W." <sjwNOSPAMatripnet.com> wrote:

Are there current nails that you can follow?
tom @ www.Consolidated-Loans.info
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