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Does anyone have any other tips and tricks to stop subfloor under carpet on second floor from sqeaking? There is no access to joists from below due to drywall ceiling. I've seen some special construction screw method where you drill the screw into the floor (until you find a joist) and with the tool they snap the head off clean.

example

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  • Are you removing your carpet or not?
    – BlueJay
    Commented Feb 20, 2019 at 2:32
  • No. I am not removing the carpet.
    – James H
    Commented Feb 20, 2019 at 2:33
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    @EdBeal - These screws are a specially designed with a larger pitch thread at the starting end and then a smaller pitch up to the break off point. The idea is that the upper thread will stay in the flooring and the larger pitch in the joist will advance that part of the screw faster and draw the flooring down to the joist. Even if the flooring does not fully draw down to the joist the upper thread is supposed to stay engaged in the flooring and bridge the gap. Installing these must be done with the spacer jig that prevents driving the screw deeper than the break off score mark.
    – Michael Karas
    Commented Feb 20, 2019 at 4:22
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    I think you're referring to squeakyfloor.com/counter-snap. I've seen this from a This Old House segment (youtube.com/watch?v=4gUW-IhSMBc).
    – tk421
    Commented Feb 20, 2019 at 6:45
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    I have used these successfully...1 more room to go, new squeaks. No return squeaks in 5 years where I have used them.
    – Jeff Cates
    Commented Feb 20, 2019 at 11:53

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