IBC Design 721.1(3) 24-1.1

1-Hour Fire Rated Wood I-joist (minimum I-joist depth 9-1/4" with a… — Minimum 0.026" thick hat-shaped channel 16"…

IBC Table 721.1(3), Item 24-1.1: Wood I-joist (minimum I-joist depth 9-1/4" with a minimum flange depth of 1-1/2" and a minimum flange cross-sectional area of 5.25 square inches; minimum web thickness of 3/8") @ 24" o.c., 1-1/2" mineral wool insulation (2.5 pcf-nominal) resting on hat-shaped furring channels.. Ceiling: Minimum 0.026" thick hat-shaped channel 16" o.c. (channels doubled at wallboard end joints), placed perpendicular to the joist and attached to each joist by 1-1/4" Type S drywall screws. 5/8" Type C gypsum wallboard applied perpendicular to the channel with end joints staggered and fastened with 1-1/8" Type S drywall screws spaced 12" o.c. in the field and 8" o.c. at the wallboard ends. 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.