
CSSBI FPB-28: Fire Protection Bulletin #28: Floor Assembly No. NRC764-F22
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This bulletin reports a fire endurance rating of 74 minutes, a Sound Transmission Class (STC) of 44, and Impact Insulation Class (IIC) ratings of 40 and 60, depending on floor finishes. The assembly features cold formed steel joists with softwood plywood subflooring and was evaluated under CAN/ULC S101 for fire resistance and ASTM standards for acoustic performance. It provides reliable data for those seeking tested solutions for fire and sound control in steel-framed floor systems.