ARDEX K 13™ is a premium self-leveling underlayment that is used to level and smooth interior concrete, terrazzo, ceramic and quarry tile, epoxy coating systems and nonwater soluble adhesive residue on concrete prior to the installation of finished flooring – on, above or below grade. It also can be installed over concrete treated with certain curing compounds (see below). Pourable or pumpable when mixed with water, ARDEX K 13 seeks its own level and provides a durable, flat, smooth floor surface with minimum labor.