Repairs from below

If the floor is over a basement or crawl space, go below to make the repairs. Start by having someone walk across the floor while you listen from below. When you hear a squeak, have the person above rap on the floor so you can pinpoint the exact spot. Next, take a thin wood shim and coat it with carpenter's glue. Gently tap the shim into the space between the joist and subfloor. Don't drive it in too far because you will raise the flooring. You just want to fill the gap above the joist and take out any "give" in the floor. For additional support, drive a 1 1/4-in. drywall screw at an angle up through the joist and shim and into the subfloor. Another effective way to silence floors from below is with a cleverly designed piece of hardware called the Squeak-Ender ($7). It consists of a threaded rod attached to a flat mounting plate and a steel bracket fitted with a squared-off hook on one end. Installation is easy: Screw the mounting plate to the underside of the subfloor with the four screws provided. Position it directly under the squeaky spot. Slide the bracket over the threaded rod and hook it onto the joist. Spin a nut onto the rod, then tighten it with a wrench until the subfloor is pulled down snug against the joist. Hold-down bracket
1. Hold the Squeak-Ender's steel mounting plate against the joist, then screw it to the plywood subfloor. 2. Tighten the nut with a wrench until the subfloor is pulled down snug against the floor joist. Glue-coated Shims
1. Tap a wood shim into the gap above the floor joist after smearing the shim with carpenter's glue. 2. Drive a drywall screw at an angle up through the joist and shim and into the plywood subfloor above.

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