How to Lay Tile on a Shower Pan

Divide the shower pan surface into four quadrants, using a level and square to lay two intersecting lines over the whole surface, from the middle of each edge of the floor to the middle of the edge across from it. If the floor drain is at the intersection of the lines, move the intersection off to one side by four tile widths. (If the tiles are 4 inches across, move one of the lines of the intersection 16 inches over so it misses the drain.)

Spread tile mortar over the intersection with a notched trowel. You should still be able to see the lines through the combed pattern of the mortar.

Set the first four tiles in place at the four corners of the intersection. Set spacers between them as you lay them.

Build off the middle tiles with more tiles, spreading more mortar as needed. Lay the tiles first along the lines and build out in a grid pattern over the rest of the floor. Lay all the full tiles that will fit, leaving open the areas along the edges and around the drain where you will have to cut tiles. Let the full tiles set overnight.

Lay full tiles loosely over the drain, in the position they will go in relation to the surrounding grid. Use a pencil to mark curved lines on the tops of the tiles for the cuts, which must leave a quarter inch of space around the drain.

Make the tile cuts on a wet saw. Set the tiles in mortar around the drain. Measure, cut and install more partial tiles for the edge of the floor by the walls. Let the cut tiles set overnight.

Spread grout over the tiles using a grout float. Force the grout into the spaces between the tiles while scraping if off the surface with the long edge of the float. Use a damp sponge to wipe up excess grout.

Let the grout set for 48 hours. Caulk around the edges of the floor where it meets the walls.