The Herculan KH 3+2 system consists of a wooden base, which is placed on special rubber pads. The wooden base is provided with a moisture-resistant film on which the rest of the wooden substructure is built on, consisting of two layers of multiplex. These layers are provided with a 3mm soft, absorbent underlayment, provided with a strong and flexible polyurethane top layer with an abrasion-resistant coating.