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Fire Rated System Design - UL D503

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UL D503

Concrete

Fire Rating

hour

Restrained‐2 hour


Restrained‐2 hour


STC / Sound Test

N/A

System Thickness

N/A

Fire Rating

Restrained‐2 hour

Unrestrained‐2 hour

System Thickness

N/A

Floor Substrate - Min. 2-1/2 in. (64 mm) thick concrete
Steel Deck - Min. 2 in. (51 mm) deep 20 ga. steel deck
Structural Members - Steel beam min. W12x19
  • Floor Substrate - Min. 2-1/2 in. (64 mm) thick concrete
  • Steel Deck - Min. 2 in. (51 mm) deep 20 ga. steel deck
  • Structural Members - Steel beam min. W12x19
  • Ceiling Support - Suspension system
  • Finished Ceiling - 5/8 in. (16 mm) gypsum board
Remarks
  • Stud size is minimum unless otherwise stated in design.
  • For the most up-to-date information refer to the UL Fire resistance directory D503 ·