Three layers of five-eighths-inch type X gypsum board are laminated to the stair riser plate with staggered joints. A continuous bead of sound caulk is applied to all edges and between each layer of gypsum board. The assembly interfaces with a seating platform and structural support above.
SEATING PLATFORM AND SUPPORT, REF. STRUCTURAL (3) LAYERS OF 5/8" TYPE "X" GYP. BD. LAMINATED TO RISER PLATE. STAGGER JOINTS. APPLY CONT. BEAD OF SOUND CAULK TO ALL EDGES AND BETWEEN LAYERS OF GYP. BD.
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