Architectural · A-787T4

Stair Shaft to Occupied Space Partition and Firestop Details

Materials

Elements

Partitions Doors Stairs Insulation Site / Paving Roof / Floor Openings

About this detail

A stair shaft and occupied space junction contains a steel beam with spray-applied fireproofing, a ledger angle, and a metal stud compensation channel with a slotted J-runner track. The void space is packed with mineral wool and finished with spray-applied firestop sealant overlapping the gypsum board and steel decking by one-half inch. A class-A smoke-rated continuous sealant is positioned under the gypsum board, adhering to UL listing BW-S-0016. Twenty-gauge Z-clips spaced at twenty-four inches on center maximum are fastened prior to the application of spray-on fireproofing. A three-and-a-half-inch curb is provided at all shafts, excluding locations with a door, and a one-and-a-half-inch deflection joint accommodates structural movement.

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