ARDEX K 15® Premium Self-Leveling Underlayment is formulated with a special blend of Portland cement, other hydraulic cements and polymers. ARDEX K 15 is used to level and smooth interior concrete, terrazzo, ceramic and quarry tile, epoxy coating systems, metal, wood substrates and non-water 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. Designed specifically for the fast leveling of floors, ARDEX K 15 provides a durable, flat, smooth floor surface with minimum labor and installation time. It is pourable or pumpable when mixed with water and seeks its own level to produce a smooth, flat, hard surface. ARDEX K 15 is recommended and specified by many flooring manufacturers, architects and contractors.