This detail shows a 2 cm (3/4 in) thick dimension stone on an unbonded mortar bed over a concrete substrate. The mortar setting bed is separated from the concrete with a cleavage membrane to allow the stone assembly to move independently of the structure. The stone is typically fresh-set (i.e., the mortar bed is still workable) and adhered to the mortar with a cementitious bond coat. Alternatively, the mortar bed is cured before adhering to the stone. An optional compatible waterproof membrane (not shown) may be applied over the mortar bed if cured. The mortar bed is reinforced with a 2″ x 2″ galvanized wire mesh. Expansion joints in the floor assembly must be provided at locations shown by the design professional. This detail is based on the Natural Stone Institute’s exterior stone paving detail, Full Mortar Bed with Membrane and Expansion Joint.