I have a condo on the third floor of an eight year old building. The floors are starting to squeek. I pulled up some carpet planning on screwing down the sub-floor. However, my sub-floor has been coated with a concrete layer (used for noise and fire control). How do I locate the joists so I can screw down the subfloor to stop the squeeking?
My thought was to locate the joists, bore out some concrete and screw down then floor, then back-fill the concrete with self-leveling cement. Is this a sound way to go?