Patent ID: 7908810

Claim:
A floor system for a building comprising: a corrugated steel deck; a first lower leveling layer of a member selected from the group consisting of cementitious material, leveling board and leveling layer sheet, applied over the corrugated steel deck; a sound reduction layer comprising a member of the group consisting of a sound reduction mat and sound reduction board; a second upper layer of cementitious material applied over the sound reduction layer and separated from the lower layer, the second layer having an upper and opposed lower surface; wherein the sound reduction layer is embedded between the first lower leveling layer and the second upper layer is under and contacts the entire lower surface of the second upper layer to completely separate and prevent any contact between the first lower leveling layer and the second upper layer for decoupling acoustic sound transmission between the first lower leveling layer and the second upper layer, wherein the sound reduction mat comprises a member of the group consisting of a polyethylene core and nylon filaments forming a three dimensional core, and the sound reduction board comprises man-made vitreous fiber, wherein the first lower leveling layer extends about 0 inches to at most about 1.5 inches (3.8 cm) above a flute of the corrugated steel deck, and wherein sufficient amount of the sound reduction layer is provided to increase IIC rating of the system by <7 IIC points above that of the system in the absence of the sound reduction layer, wherein the second upper layer has a thickness of about 0.25 inches to 3 inches, and wherein the perimeters of the sound reduction layer, and second layer, are surrounded by perimeter isolation strips in order to separate the sound reduction layer and the second upper layer of cementitious material from a vertically extending wall to be installed on the first lower leveling layer.