Squeeeeek No More as seen on Ask This Old House is an excellent squeaky floors under carpet repair kit to eliminate floor squeaks, especially when there is no access to the floor joists. This squeaky floor repair kit is used directly through carpeting. Really!
I'll admit I was skeptical at first. Always before when I put a screw through carpeting, the screw would grab the nap of the carpet and wrap itself up. This time to be safe, I tested the Squeeeeek No More on a closet floor. Only when I felt comfortable with it did I tackle a couple of squeaky areas in the hallway.
The Squeeeeek No More Pro Kit contains a zinc alignment and depth control fixture, 500 specially scored 3-inch x 1/8-inch diameter screws (500 bulk pack screws), two customized driver bits to regulate the depth at which to drive the screw, six joist-finding screws to help find the joist from above, and two sample carpet (Berber or Looped) screws.
I have not tested the joist-finding screw that's part of the kit, but basically the joist-finding screw has only four threads at the end of the screw. If, after installing the screw through the carpet, underlayment, and subfloor it hits dead space, the screw will spin, but can be backed out with the aid of power screwgun and a pair of pliers. If it hits something solid, like a floor joist, it will back out the same as any other fastener.
Squeeeeek No More works so well because the 3/16-inch coarse thread of the special screw prevents it from being wrapped in carpet nap and the score on the neck of the screw allows it to snap off below the surface of the floor.
This product has a great 18 years+ track record and is successfully used by DIYers and professionals alike. Customers who have called to tell us they were unable to get the kit to work or that the kit didn't work hadn't carefully read the Troubleshoot Before Using The Squeeeeek No More Kit (above) or the Troubleshooting (below), didn't understand their floor's construction and/or how squeaks travel, or didn't know how to properly use a cordless drill.
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If you've got squeaks under your carpeted floors, the Squeeeeek No More Pro Kit is for you! All you need is a power screwgun and the courage to put that first screw through the carpet.
The Squeeeeek No More Pro Kit ships at 9 pounds.