Bostik Cempolay Deep is a one part, deep-fill self-levelling compound for smoothing and levelling uneven floors prior to laying decorative floor coverings. The deep-fill screed allows for applications between 5mm and 50mm in a single pour. It is ideal for filling uneven floors, raising floor levels, levelling uneven subfloors in light and heavy-duty internal applications and even forming sloping screeds.The high-performance self-levelling compound can be laid over substrates including concrete, sand/cement screeds, stone/brick, rigid timber and unglazed ceramic tiles. It can also be used with water underfloor heating systems. The protein-free formula means that Bostik Cempolay Deep can be used in biologically sensitive areas. Once set, the surface of the deep-fill floor leveller should always be covered with a suitable floor covering. This self-levelling compound covers approx. 2.7m² at 5mm thickness, 1.35m² at 10mm thickness, 0.65m² at 20mm thickness and approx. 0.27m² at 50mm thickness.