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Securing my subfloor to joists

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  • May 6th, 2020 10:15 pm
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[OP]
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Feb 17, 2012
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Securing my subfloor to joists

So I removed all the carpet and replacing with laminate. During this next step I want to secure my osb subfloor to the joists. The house is a 2005 build. Not much squeaking when it had carpet installed. I can see where the builder nailed there nails into the joists. I want to secure the floor with screws even though it is not squeaking but may in the future. Since I can see the nail spots, can I drive a screw like 0.5-1cm beside there nail all around the subfloor? The floor i think is only 5/8 or 3/4 inches thick. Not really sure. What length of a screw would I need? 2 inches? I see Home Depot has 1 1/4 flooring screw but from head to tip it’s all threaded anything above 1 1/2 inches is head/smooth shank/threaded tip. Is there a difference?

I was thinking to use this screw
https://www.homedepot.ca/product/paulin ... 1000152690
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Oct 13, 2008
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minimum 2" screws ...
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Aug 2, 2001
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You want screws that are partially threaded because the threaded part will be in your joist and it "pulls" the plywood down the smooth part to "clamp" it.

2" screws are enough.

Spacing of 6" along the edges and 12" elsewhere. I assume your nailing pattern has this already.
[OP]
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TrevorK wrote: You want screws that are partially threaded because the threaded part will be in your joist and it "pulls" the plywood down the smooth part to "clamp" it.

2" screws are enough.

Spacing of 6" along the edges and 12" elsewhere. I assume your nailing pattern has this already.
Yes I saw something like this pattern when builder nailed the subfloor down. So can I drive a screw beside every nail on the subfloor? It would be 0.5-1cm beside the nails
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Feb 26, 2019
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Ottawa
Depending on how much flooring you have to do, you may want to look into renting a stand-up screw gun for the job. You need to evaluate your personal balance of cheapness and laziness...
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Palidino wrote: Yes I saw something like this pattern when builder nailed the subfloor down. So can I drive a screw beside every nail on the subfloor? It would be 0.5-1cm beside the nails
I would not do it beside the nails.

4"-6" on both sides of the nails add a screw. Guaranteed to have it tight.
16'x11' Living Room 11' Cathedral Ceiling. Hisense 65Q8G. Denon AVR-S740H 7.2 setup. Jamo Classic 10 280W Towers - FR+FL; Polk S35 - Center; Klipsch R51M - RR+RL; Klipsch R14M - Dolby FHR+FHL; Polk HTS10 Subwoofer x2. Unlocked Android Boxes from Taiwan x2
[OP]
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Feb 17, 2012
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AV-Fishing wrote: I would not do it beside the nails.

4"-6" on both sides of the nails add a screw. Guaranteed to have it tight.
So you mean if the length of the board it’s currently 6 inch spacing, I should screw on the 3rd inch basically in between. And the 12 inch short side, is probably the joist spacing I should leave that?
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If the nails currently are spaced 12" ... then do screws in between the nails ...

putting screws too close to the nails would eventually have the nail heads pop up.

nails get loose over time where as screws are harder to be loosen
16'x11' Living Room 11' Cathedral Ceiling. Hisense 65Q8G. Denon AVR-S740H 7.2 setup. Jamo Classic 10 280W Towers - FR+FL; Polk S35 - Center; Klipsch R51M - RR+RL; Klipsch R14M - Dolby FHR+FHL; Polk HTS10 Subwoofer x2. Unlocked Android Boxes from Taiwan x2
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Feb 26, 2019
406 posts
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Ottawa
AV-Fishing wrote: If the nails currently are spaced 12" ... then do screws in between the nails ...

putting screws too close to the nails would eventually have the nail heads pop up.

nails get loose over time where as screws are harder to be loosen
If you put a screw beside a nail, that nail will not loosen over time. If it is already loose, it could squeak, so hit it with a hammer to make sure it’s set.

What is the advantage to putting the screw 6” away from the nail? Never heard that trick before.
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Aug 2, 2001
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Palidino wrote: Yes I saw something like this pattern when builder nailed the subfloor down. So can I drive a screw beside every nail on the subfloor? It would be 0.5-1cm beside the nails
I see no problem with that. The screw will clamp the floor down.

I see what the other poster is saying in that they feel a nail next to a screw will cause the nail to pop over time but my thought would be that putting screws in between the nails would make it more likely for the nails to pop since the subfloor would flex more around the nail (greater distance between it and the screw, which is doing a good job of keeping it secure). When the screw is beside the nail, the floor should have very little flex.

Personally I don't think either will cause a problem and it is probably just being nitpicky. Many people lay laminate over their floors that are nailed down with no issues, so the mere fact you are putting a thousand screws into yours will only improve it. Sometimes over the internet people will debate for days about something that will cause no noticeable problem.

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