Rigid composite flooring refers to modular flooring that is constructed with a polymeric core to provide dimensional stability. Also referred to as rigid core flooring, it is enhanced by a decorative top layer as well an optional attached soft underlayment, which provides sound absorption and cushioning. There are two rigid core product constructions, including a wood plastic composite (WPC), or expanded polymer core, and a stone plastic composite (SPC), or solid polymer core. Rigid composite flooring can be installed over most existing hard surfaces and does not require subfloor preparation, adhesives, or acclimation. The application of rigid composite flooring works well in water-prone areas, as it does not expand or contract when moisture is present.