Wood is a good surface to lay tile on, but there are a few things to consider. The wood floor must be even and sturdy to prevent tiles from bending and cracking, which is likely with ceramic tile and loose wood. A properly prepared wood subfloor prevents problems with the tile in the future. Taking the extra time now saves you future effort and expensive repairs.
Check the wood flooring to make sure it is attached securely to the floor joists. Secure squeaky or moving boards with 1- and 5/8-inch drywall screws using a drill.
Measure the room's length and width. Multiply the two to get the square footage and use this number to order tile.
Set one of the tiles near the door jamb and undercut the jamb at the height of the tile.
Snap a chalk line across the middle of the room, going from the door to the opposite end of the room. Cross the first chalk line with another snap going across the middle of the room from the other walls.
Place the tiles along the chalk line to get them straight. Do a dry run to make sure the tiles are straight.
Lift up the tiles and lay down the tile adhesive for the tile type you are using. Apply the adhesive in small areas at one time to prevent it from drying out.
Cut tiles that will not fit onto the floor as whole pieces by placing the piece of tile on top of the closest tile to the wall. Mark on the tile where the cut should be. Cut the tile and lay it onto the adhesive.