IBC Design 721.1(3) 23-1.1

1-Hour Fire Rated Wood I-joist (minimum joist depth 9-1/4" with a… — 1/2"-deep single-leg resilient channel 16"…

IBC Table 721.1(3), Item 23-1.1: Wood I-joist (minimum joist depth 9-1/4" with a minimum flange depth of 1-5/16" and a minimum flange cross-sectional area of 2.25 square inches) at 24" o.c. spacing with a minimum 1 x 4 (3/4" x 3.5" actual) ledger strip applied parallel to and covering the bottom of the bottom flange of each member, tacked in place. 2" mineral wool insulation, 3.5 pcf (nominal) installed adjacent to the bottom flange of the I-joist and supported by the 1 x 4 ledger strip.. Ceiling: 1/2"-deep single-leg resilient channel 16" on center (channels doubled at wallboard end joints), placed perpendicular to the furring strip and joist and attached to each joist by 1-7/8" Type S drywall screws. 5/8" Type C gypsum wallboard applied perpendicular to the channel with end joints staggered not less than 4' and fastened with 1-1/8" Type S drywall screws spaced 7" on center. Wallboard joints to be taped and covered with joint compound. Minimum slab thickness — 1-hr: Varies". Minimum ceiling thickness — 1-hr: 5/8". Prescriptive assembly from the adopted building code — see table footnotes for conditions.