Achieving a suitable adhesive bed
The adhesive bed performs a number of functions: it sticks the tile to the surface; it absorbs differential movement between the substrate and the tiles; it protects the substrate from water; it absorbs deflections; it enables the tiler to adjust the height of each tile; it accommodates limited errors in the substrate. There are a number of ways that an improper adhesive bed can cause problems in the life of the installation, as detailed below.