Nailed subfloor, should I screw too?

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Old 10-27-13, 10:38 PM
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Nailed subfloor, should I screw too?

Having a second story added to my ranch. The 3/4 tongue and groove plywood subfloor was glued and nailed. I didn't specify that I wanted it screwed, but that was an oversight on my part.

My contract doesn't include flooring for anything other than the bathroom. I will be subbing that out myself. Will be getting carpet in 3 bedrooms, and 3/4" hardwood ina hallway.

My question is, shoudl I add screws to the subfloor in a ddition to the nails? I don't want the floor to squeek. They did glue it, but not sure if adding screws can only help, or if it could hurt it in some way.

Appreciate all thoughts on this.
 
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Old 10-27-13, 10:43 PM
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Not going to hurt anything.
I'd bet that 99% of subfloors only get nailed down.
I use #8 ring shank nails so it should not go anywhere.
I feel screws just may pull it down so tight is presses the glue out.
 
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Old 10-28-13, 11:35 AM
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I did this in my in-laws' lake place when they were building it - two weekends on my hands and knees driving deck screws but it's 10 years later and not one squeak in the floor.

Note I said deck screws, you don't want to use drywall screws for this.
 
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Old 10-28-13, 08:43 PM
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Thanks guys. I'll probably do it. Trying to tighten up any details I can.
My only fear was I might disrupt the glue adhesion using screws well after its dried.
 
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Old 10-31-13, 01:34 PM
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Nails Pop

Very simply, nails pop screws hold. Don't care if it's a ring nail, spiral nail, common nail, the deflection (movement) in the floor loosens the hold over time and the movement (glue or no glue) between the nail and building members will be stuck under your finished floor squeaking away.

Go to local rental store rent an auto-feed floor screwing tool like the picture shows. Spend 2 hours, return the screw gun. Alternatively, your tile setter should be using a autofed screw gun to screw his subfloor in the bathroom prior to installing tile, ask him if he can provide you a cost to do this throughout the rest of the new plywood and work the cost vs. time equation.
 
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Old 10-31-13, 01:37 PM
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we stopped nailing drywall/sheetrock a long time ago...........
 
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