Building 1246 VPT - Roof Hatch Door Replacement

Added:Sep 06, 2019 11:40 amThis work summary describes replacing the existing roof hatch door with a new replacement sliding roof hatch. The 1246 VPT facility roof top level is approximately 63 ft above adjacent grade. The side width dimensions (plan dimensions) of the VPT facility are 52 ft x 54 ft. The roof hatch is located approximately in the middle of the roof. See Ref (1). The existing roof hatch is approximately 15'-8" x 15'-8" out to out and has two leafs approximately 7'-10" that swing outward (upward) into the open position.Removal of the existing door hatch and installation of the new roof hatch door assembly will require use of a crane.The existing roof hatch door assembly rests on a structural steel curb that is approximately 3 ft high above the roof deck. This curb is integral with the steel roof framing and will remain. Roof membrane runs up each side and terminates at the top of the curb framing, beneath the roof hatch assembly frame.The proposed replacement roof hatch is a sliding type roof hatch assembly. The roof hatch door will slide laterally on wheels along rails mounted on back track