Squeak-Ender, also known as the Squeakender squeaky subfloor repair kit, has an unusual but effective design. Its main purpose is to pull the subfloor securely to the joist.
Squeak-Ender has two main parts: The first includes the hanger bolt which fastens to the underside of the subfloor against the joist with four provided screws. The second is a bracket that slips over the joist and the hanger bolt. Finally, install the washer and nut and tighten with a wrench until the squeaking stops. Be careful not to overtighten.
After testing the product, I have a couple of recommendations. You may want to consider a lock washer. Also, if you plan to finish the ceiling, notch the bottom of the joist to recess the joist bracket. This will help maintain a smooth surface for the later application of wallboard.
Basic instructions for Squeak-Ender:
Squeak-Ender can be used on most subfloors and floorboards supported by joists up to 2x10s. It positively helps to eliminate squeaky floors in existing homes, new construction, and mobile homes.
Each package includes: