Interlocking rubber floor tiles is a good choice for a bathroom because of its water resistance. It is available in two basic models: sheet and tile. Rubber tiles are easier to install in the small confines of a bathroom. They are also easier to cut to fit around bathroom fixtures. Both the rubber tile and sheet material is sub floor with glue. Some styles of rubber sheets have an interlocking rubber floor tiles edge that snaps together.
Clean the floor using a broom or vacuum store. Scrape away any drywall mud or paint stains, using a trowel. Sand high points in a wood subfloor with a hand grinder. Use latex filler to raise low spots on both concrete and wood subfloors. Follow package directions, allowing the filler to dry and sand away any bumps.
Cut 6 mm polyethylene sheet to fit the floor, using a utility knife. This acts as a moisture barrier and is optional, but recommended. Measure the half-way on all four walls. Snap a chalk line between each pair of opposed walls at the center mark. The place where the lines intersect is the center of the room. Set the interlocking rubber floor tiles on the floor in a quadrant. Repeat for the other quadrants.
Snap the plates together in one quadrant, starting with my tile and working towards the corner. Do not set the outer perimeter trays at this time. Set tiles in place for the remaining three quadrants. Measure the width of the outer row of tiles need to be. Keep a straight tool along the top of the plate to the desired width. Press hard with a utility knife to cut the tiles.