Subfloor
The subfloor in any structure is the rough floor under your finish floor. This can be a concrete slab or any material laid on top of [joists]. The most common material to use is [OSB], but [Durarock] is also a common subfloor used under tile. If your floor has creaks or soft spots, it usually has to do with loose or damaged subfloor.
Tool Basics
Tool Basics