US Patent 10066390 Two-hour fire-rated modular floor/ceiling assembly

A floor-ceiling assembly is provided for joined upper and lower modular construction units, including a floor surface of the upper unit using structural cement panels; a floor grid including at least one floor joist and at least one beam each having an upper surface receiving said structural cement panels, a web and a lower surface. At least one connector plate is secured to the lower surface. A ceiling framework of the lower unit has at least one ceiling beam and at least one ceiling joist secured to each other, at least one of the beams is secured to the at least one connector plate. A resilient channel is secured to an underside of the ceiling framework, and a ceiling panel is secured to the resilient channel.