The crossword solution for the term INSTALL, AS TILES is LAY. To install tiles, one must LAY them down in the desired area. This is done by first measuring the area and then cutting the tiles to fit. After that, the tiles are placed on the surface and secured with adhesive. Finally, grout is used to fill in the gaps between the tiles. Installing tiles can be a difficult job, but it can also be very rewarding when the finished product looks great.