A non-rated floor assembly consists of a concrete floor over a composite steel deck supported by a steel beam, with a specified two-hour beam assembly under UL D759. At the second floor bottom of the shaft, a one-hour fire rating is maintained using spray fireproofing per UL D796.
F4 CONCRETE FLOOR PER STRUCTURAL COMPOSITE STEEL DECK PER STRUCTURAL (NON-RATED FLOOR ASSEMBLY, TYP) 2 HR BEAM ASSEMBLY : UL 263 NO. D759, FIRE RATING NOTE AT 2ND FLR BOTTOM OF SHAFT: 1 HR RATING WITH SPRAY FIREPROOFING PER UL D796.
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