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ESR-1308 | Most Widely Accepted and Trusted Page 17 of 21 For SI: 1 inch = 25.4 mm, 1 foot =304.8 mm, 1 psf = 4.88 kg/m2, 1 gallon = 3.81 L, 1 sq. ft. = 0.0929 m2, 1 psi = 6.89 kPa, 1 lbm = 0.45 kg, 1 sq. in. = 645.16 mm2. 1. Roof Covering: Roof covering consisting of hot-mopped or cold application materials compatible with insulation(s) described in Item 2 that provide Class A, B or C coverings. 2. Roof Insulation—Mineral and Fiber Boards: The boards must comply with ASTM C612, Type 1A or 1B; 24-by-48-inch minimum size, maximum size 48 by 96 inches, to be applied in six layers. Boards to be installed perpendicular to gypsum wallboard direction, with end joints staggered 2 feet in adjacent rows. Each layer of board must be offset, in both directions, from layer below a minimum of 12 inches in order to lap all joints. Minimum board thickness is 1 inch (No limit on maximum overall thickness.) 3. Sheathing Material (Optional): Vinyl film vapor barrier, applied with adhesive to the gypsum wallboard. Adjacent sheets overlapped 2 inches. 4. Gypsum Sheathing: Water-resistant core gypsum sheathing complying with ASTM C79. Supplied in sheets nominally 2 by 4 feet to 4 by 12 feet, by nominal 5/8 inch thick. Minimum weight is 2.0 psf. Applied perpendicular to the steel roof deck direction with adhesive, or laid loosely. End joints to occur over crests of steel roof deck, with end joints staggered 2 feet in adjacent rows. 5. Steel Roof Deck: Minimum 0.019-inch-thick (26 gage), minimum 1-inch-deep, minimum 25-inch-wide, painted or galvanized, fluted steel deck. Flutes must be approximately 4 inches on center, crests approximately 2 3/4 inches wide. As an alternate, 11/2-inch-deep, minimum 18-inch-wide fluted galvanized steel deck is permitted. Minimum 0.029-inch-thick (22 gage) flutes must be 6 inches on center, crest width ranging from 31/2 to 5 inches. Deck must be welded to supports with welding washers spaced 12 inches on center. Side lap joints of adjacent units welded or secured together with No. 12 by 1/2-inch self-drilling, self-tapping steel screws midway between steel joists. 6. Fasteners: A. Adhesive (Optional): BMCA Insulation Products Inc.: May be applied between crests of steel roof deck and gypsum sheathing in 1/2-inch-wide ribbons, 8 inches on center, at 0.4 gallon per 100 square feet. May also be applied in 1/2-inch-wide ribbons, 6 inches on center, at 0.4 gallon per 100 square feet, between gypsum sheathing and vapor barrier, and between gypsum boards and roof insulation when vapor barrier is omitted. May also be applied at the same rate between layers of roof insulation. B. Mechanical Fastener: (Not shown) Any steel nail or steel clip designed for the purpose may be used to attach one or more layers of insulation to steel roof deck (through gypsum sheathing). The gypsum sheathing may also be attached directly to the steel roof deck with the mechanical fasteners. C. Hot Asphalt or Coal Tar Pitch: (Not shown) May be used as an alternate to adhesive between layers of roof insulation, at a rate not to exceed 35 pounds per 100 square feet. 7. Steel Joists: Type 10J4 or 12K1 minimum size. 10K1 size may be used when limited to a span of 12 feet 0 inches, maximum. As an alternate, any LH Series steel joists spanning no greater than 60 feet may be used. For spans greater than 60 feet, LH Series joists may be used, provided their vertical deflection under total load must not be greater than 1/244 of the joist span. 8. Bridging: Steel bars, 1/2 inch in diameter, welded to top and bottom chords of each joist. 9. Cold-rolled Channels: Number 16 MSG cold-rolled steel channels, 11/2 inches deep with 9/16-inch flanges must be placed on lower chord of joists and secured with 18 SWG galvanized steel wire. Installed perpendicular to joists, the channels must be located as required to provide hanger wire attachment points. When steel joists are spaced more than 5 feet on center, two cold-rolled channels must be placed back to back and tied together with a double strand of 18 SWG galvanized steel wire at 24 inches on center. The double channels installed perpendicular to the joists and spaced a maximum of 48 inches on center may be placed on top of the joists' bottom chord and tied to each joist with a double strand of 18 SWG galvanized steel wire, or suspended below the joists with 12 SWG galvanized steel wire wrapped around the cold-rolled channels and with the other end wrapped around the bottom chord of the joists. FIGURE 6—8500 SERIES ONE-HOUR FIRE-RESISTANCE-RATED ASSEMBLY 2130 E 17th St - 10111279406/07/23