This will work on squeaky stairs as well as floors.
For floors covered by wall-to-wall carpeting, a kit called Squeeeeek No More ($19.95 at squeaknomore.com) allows screws to be used without removing the carpet. The kit, sold by O'Berry Enterprises, a tool company in Ringwood, Ill., includes 50 thin screws, a drill bit and a screw with special threading to detect when contact is made with a joist (other joists can then be located because they are spaced 16 inches apart).
The screws are drilled through the carpet, into the floor and down into the joist. Their heads are designed to be broken off with a tool that comes with the kit, leaving the threaded section of the screw in place below the floor surface. Because the screws are thin, the repair is usually invisible (or the carpet fibers can be fluffed to hide them).
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