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I want to use some stop squeak screws that pull the subfloor tight to the joists, then break off beneath the surface of the floor. I am having a difficult time locating the joists: my stud finder doesn't seem to work very well and I am losing my marbles drilling holes through carpeting and missing the joist. I am doing this on both carpet and vinyl.

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I would take up the carpet before doing this anyway for exactly that reason. –  Yitzchak Dec 29 '11 at 16:35
    
It's a rental. I have two kids and the squeaks make sneaking around difficult without waking them up. –  Evil Elf Dec 30 '11 at 14:01
    
Stupid comment time...Can you use a strong rare earth magnet the can detect the nail head in through the carpet? –  lqlarry Feb 26 '12 at 17:57
    
@lqlarry - that's a fine idea, there are nailfinders for people that work with salvaged wood, but they are expensive - maybe they are rentable? –  dbracey Feb 26 '12 at 18:22
    
Sometimes you have them in your house and don't know it. My 24 year old kid has these magnets on his desk that he fiddles around with time to time. Just some are bigger than others. –  lqlarry Feb 26 '12 at 18:28
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3 Answers

up vote 5 down vote accepted

The joists should be at the squeak, you just need to determine the direction of the joists. Typically, this is the shorter distance between exterior walls, unless there are interior load bearing walls used to break up the span. Some stud finders have a deep penetrating settings that might find a joist through carpet. And you can also try finding the joists in the ceiling below and measuring the distance from a common wall.

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ahh, good idea coming at it from the ceiling below. –  Evil Elf Dec 30 '11 at 14:02
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If this is the first floor of a house, then you can see the subfloor from underneath in the basement. You can guesstimate where the joist is, shoot a screw on either side, go underneath and measure where the joist is between the screws, go back up and use the measurement to hit it.

BUT...

Those kind of screws were originally designed to re-attach a single board in a place where it had popped loose on a floor made of nailed-down individual boards (especially squeaky stair treads). I doubt very much they are going to do anything at all if you have a plywood subfloor. You would be asking a couple of screws to handle a load that 50 or more nails or screws are currently failing to do. Floors like this creak because they aren't sufficiently structured, and over time the nails loosen and let the joists rub against the subfloor as it bounces.

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Your stud finder won't work because you have 3/4" -- if not more -- plywood.

Q: What size screws are you using?

If your screws aren't getting embedded into the floor then you're not grabbing the joist. You need 3" galvanized or Deck Mate screws. Even drywall screws will work but the threads have to be coarse.

Galvanized screws or deck mate screws are what you need, 3" screws are what you need even Sheetrock screws will work but the threads have to be corse.

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He's not taking the carpet up, so he's using screws with snap-off heads. The drywall screws will also snap off, but in a bad way... –  dbracey Feb 26 '12 at 15:57
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They make special screws for this. And it comes with the tool to snap off the screw. –  lqlarry Feb 26 '12 at 18:30
    
Brake away screws the head snaps off once impaled into the wood. –  Mark Feb 26 '12 at 22:02
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