Patent ID: 7454876
Filing Date: 2008-11-25
Classification: E04D,Y10S

Abstract:
1. A method for making a fire retardant roof assembly including: applying a slow-rise fire retardant urethane spray foam, sprayed over length and widthwise joints of a corrugated metal deck, as well as any fastener or through-deck openings in the deck, to prevent the fluid migration through the deck; adhering polystyrene insulation to the slow-rise fire retardant urethane spray; overspraying the abutting board butt ends, to encapsulate each polystyrene board with foam; creating an insulation gap at perimeters, penetrations, curbs, abutting walls, and rooflop equipment a minimum of two inches, and filling gap with fire retardant slow-rise adhesive foam, to encapsulate those areas from fire exposure to the polystyrene foam; covering the polystyrene foam with a cover layer of fire retardant urethane spray foam; installing a single-ply waterproofing membrane over the single coat layer; air sealing the single-ply waterproofing membrane to the cover layer spray foam cover layer at perimeters and penetrations.