ARDEX K 40 HB is a versatile, fiber-reinforced, high-build levelling and smoothing compound designed for a wide range of applications, with thicknesses ranging from 3mm to 40mm. This advanced compound hardens rapidly, allowing for a swift turnaround in construction or renovation projects. It is suitable for use on most new and existing internal subfloors, including concrete, cement/sand screeds, anhydrite screeds, stone, terrazzo, ceramic tiles, and appropriate timber floors. ARDEX K 40 HB is particularly useful for levelling uneven, damaged, or rain-damaged in-situ concrete subfloor