30-MINUTE RESIDENTIAL FIRE PROTECTION OF FLOORS

摘要

A fire protective barrier for a residential floor and a method of its construction, the construction involving a floor supported on lightweight joists of a type susceptible to early failure once exposed to a fire existing in the space below the floor, an array of elongated steel main tees suspended below the joists, the tees being parallel and spaced apart by a nominal distance of 2’, the tees having an upper hollow reinforcing bulb, a central vertical web extending downwardly from the bulb and a horizontal flange extending laterally from both sides of the web, drywall panels carried on upper faces of the flanges of adjacent pairs of tees, the drywall panels having a width of slightly less than the center-to-center distance of the tees, a majority of the panels having lengths of 8’ or more. Figure 1.