What are the advantages of a mortar bed?
In the case of the floating mortar bed, the tile layer is unaffected by minor cracking and movement in the substrate. This can be very important in applications over concrete where cracking in the concrete could result in cracking in the tile. It is also very important in tile installations over structural slabs (not on grade) or other structures where vibration and deflection can be expected (as occurs in some exterior walls).
