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Old 03-14-2012, 12:00 PM   #16
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Securing plank subfloor to joists?


Seems to be general consensus that the 1-1/4" screws I have will do the job.

Mostly asking about the #10 2" screws: Will the ones I've purchased (see above post) work well?
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Old 03-14-2012, 12:01 PM   #17
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Securing plank subfloor to joists?


I was taught 1 1/4 screws are never used for any flooring except luon and hanging sheet rock and butting cabinets together.
Be on the safe side and go higher up on the size.
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Old 03-14-2012, 12:07 PM   #18
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Securing plank subfloor to joists?


Quote:
Originally Posted by duffman56
Seems to be general consensus that the 1-1/4" screws I have will do the job.

Mostly asking about the #10 2" screws: Will the ones I've purchased (see above post) work well?
Just because you have 1/2 ply doesn't mean that you exceeded your screw size, I'm just saying that you have to take in consideration that you need to make shore that ply doesnt go anywhere
The more the screw holds on to the underneath the less Likely it's will move. Use your 2" that you have for a piece of mind.
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Old 03-14-2012, 12:43 PM   #19
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Securing plank subfloor to joists?


JetSwet
Actually I'm asking if the #10 2" screws are a good size for attaching the t&g to the joists (two per t&g plank, each place it sits on joist).
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Old 03-14-2012, 01:20 PM   #20
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Securing plank subfloor to joists?


Quote:
Originally Posted by duffman56
JetSwet
Actually I'm asking if the #10 2" screws are a good size for attaching the t&g to the joists (two per t&g plank, each place it sits on joist).
Yes they are good sorry about that.
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Old 03-14-2012, 01:42 PM   #21
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Securing plank subfloor to joists?


Very good.

These screws claim no pre-drilling is required. If I were to purchase some more (and I'm going to need A LOT more) #10 2" screws that don't advertise this, I'm guessing I would need to drill a pilot hole for each screw to avoid splitting the wood. What size bit is recommended for this?
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Old 03-14-2012, 01:52 PM   #22
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Securing plank subfloor to joists?


Aren't you putting the screw in the center of the boards?
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Old 03-14-2012, 02:08 PM   #23
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Securing plank subfloor to joists?


The only spax I have used are masonry type, try to screw it in the board and if you inbed the screw like a 16th inside the board you should be good with out having to predrill.
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Old 03-14-2012, 03:28 PM   #24
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Securing plank subfloor to joists?


mnp13:
No, I am putting TWO screws, per plank, per joist. I realize this will be a lot of screws, but I'm told this will minimize cupping.

I was planning on putting a screw about 3/4" in from each edge of each plank. Given this distance would this minimize the chance of #10 screws splitting the planks?

Just wanting to make sure I'm doin the little things right. I am very grateful to everyone for being so patient with such a newb.
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Old 03-14-2012, 04:54 PM   #25
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Securing plank subfloor to joists?


Well I'm not at your house with you to see the boards, but i would guess at that distance pre-drilling wouldn't be necessary
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Old 03-14-2012, 06:18 PM   #26
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Securing plank subfloor to joists?


I didn't pre drill, except at the butt joist because they had a tendancy to split.
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Old 03-14-2012, 08:22 PM   #27
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Securing plank subfloor to joists?


Just put the first screw in (3/4" in from edge) and yep, it split the plank. Guess I'll have to drill pilot holes to avoid this?
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Old 03-14-2012, 08:30 PM   #28
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Securing plank subfloor to joists?


Get a nail gun and shoot ring shanked 8d nails into the subfloor. Screws are not necessary.
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Old 03-14-2012, 08:48 PM   #29
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Securing plank subfloor to joists?


Duff,

Just in case you're not in the mood to spending several hundred on a nail gun and a compressor, you can easily hammer 8D deck nails and be done. It's common for the planks to split near the ends. So just drill does, 1/8" should be good.

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Old 03-14-2012, 09:42 PM   #30
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Securing plank subfloor to joists?


Ok, so ringshank 8d nails will do just as well as the screws? I may switch to them, although the pilot holes/screws went pretty quick tonight.

However, we ran into another problem... After we secured all the planks to the joists I had my wife jump up and down. She is not a big girl... There was noticeable deflection. I went down to the basement to investigate. She was actually only a foot or two away from a steel I-beam which runs perpendicular to the joists. This I-beam has a piece of wood (2x4 maybe) running across the top. The particular joist that was below her is not quite making full contact with the wood on top of the I-beam.

Do I need to put some kind of shims between the wood on top of the I-beam and the bottom of the joists so they are making good contact? Any suggestions on how to do this? I was thinking about trying to pry the joist up so that I could get the shims in. Do you guys think this would work?

Last edited by duffman56; 03-14-2012 at 10:24 PM.
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