IBC Design 721.1(3) 27-1.1

1-Hour Fire Rated Wood I-joist (minimum I-joist depth 9-1/2" with a… — Minimum 0.019" thick resilient channel 16"…

IBC Table 721.1(3), Item 27-1.1: Wood I-joist (minimum I-joist depth 9-1/2" with a minimum flange depth of 1-5/16" and a minimum flange cross-sectional area of 1.95 square inches; minimum web thickness of 3/8") @ 24" o.c.. Ceiling: Minimum 0.019" thick resilient 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. Two layers of 1/2" Type X gypsum wallboard applied with the long dimension perpendicular to the resilient channels with end joints staggered. The base layer is fastened with 1-1/4" Type S drywall screws spaced 12" o.c. and the face layer is fastened with 1-5/8" Type S drywall screws spaced 12" o.c. Face layer end joints shall not occur on the same I-joist as base layer end joints and edge joints shall be offset 24" from base layer joints. Face layer to also be attached to base layer with 1-1/2" Type G drywall screws spaced 8" o.c. placed 6" from face layer end joints. Face layer wallboard joints to be taped and covered with joint compound. Minimum slab thickness — 1-hr: Varies". Minimum ceiling thickness — 1-hr: 1". Prescriptive assembly from the adopted building code — see table footnotes for conditions.