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Mosaic tiles are small tiles used for many purposes, among them the creation of images, the addition of focal points on a particular wall or floor section, etc. In this case we are using them to help us maintain a nice inclination toward the drain of a shower as well as grip. Measure the area and determine how many sheet of tiles you will need, cut the areas from the sheet that will seat over the drain with a knife to easily place the rest of the sheet around the drain, using a snap cutter or a small wet saw cut all the small pieces and install them individually if necessary. to avoid excessive amounts of cement from coming through the tiles use a robber trowel or any other medium size flat trowel to help maintain a strait and even surface. Put special attention to the small tiles around the drain, you want them to be just above the drain surface, avoid sharp edges that can cut you feet. Clean the excess cement with a small tool, nail or screw and wipe the remaining cement with a cleaning sponge. Once the cement is dried, finish cleaning any extra cement and apply the grout. The grout should be a bit loose when poured over the tiles so it can penetrate well in all the crevasses. Allow the grout to dry and wipe it with clean water.