COREtec One Plus features our innovative COREtec WPC structure, and an attached cork underlayment for sound absorption. Since COREtec One Plus is 100% waterproof, COREtec floors can be installed in wet areas and will never swell when exposed to water. COREtec One Plus is inert and dimensionally stable; it will not expand or contract under normal conditions. Further, COREtec One Plus never needs expansion strips in large rooms. COREtec One Plus features our innovative COREtec WPC structure, and an attached cork underlayment for sound absorption. Since COREtec One Plus is 100% waterproof, COREtec floors can be installed in wet areas and will never swell when exposed to water. COREtec One Plus is inert and dimensionally stable; it will not expand or contract under normal conditions.