When building a bathroom subfloor, there are many different kinds of materials you can use for your subfloor. There is proper material to use. Before you begin you need to make sure that your floor joists are good and strong enough to hold, so you don’t have to worry about them giving away when you walk on them. You also need to take a level and make sure your joists are level so that your floor will be level. After you have made sure your joists are right, then you can begin.
When picking your subfloor material you need to also decide what kind of floor covering you are going to use. When building your subfloor you need to put down 23/32 inch Osb board which comes in 4′ x 8′ sheets. You have to measure your floor area find out how Osb you need. You may want to double your floor, but that is optional. After marking your joist so you know where your joists are cut your Osb sheets so that they cover your joists. You want them to go from wall to wall. Mark your areas where your water lines come through the floor to connect to your toilet and sink.
After you cut your Osb sheet for your lines you need to attach your Osb sheets to your joists. This is to make sure your sheets will not move. Be sure to user 3 ½” screws, because nails will on time work their way out and squeak. Now that you have your subfloor done you can add your floor covering that you have decided to go with.
When you are ready to put your floor covering down be sure you put concrete board down around your bathtub and around you toilet, this way if you do have a leak the water will not get down to your Osb sheet and make your subfloor rot. If your subfloor gets too much water on it you will have to start all over again. Putting down a subfloor is an easy task. You don’t have to be a construction worker to do it. Just take your time and make sure you have everything you need before you start. The tools you will need is a skill saw, a jig saw, a level, a drill with a screwdriver bit to put your screws in with, and a sound mind. Happy Building.