Professional grade products utilize natural rock or pressed masonry mixes that meet business standards. A professional grade product may have attributes such as: no crack, no gap, no backache, no loose tiles, and no unsightly seams. To reduce the chance of tile installation errors, make sure you follow the instructions carefully. For example, for wall layout, always start by setting up the walls to be set up . After that, install all of the fittings that are essential to complete the layout.