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Fire Rated System Design - UL G525

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UL G525

Steel Bar Joist

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. 3-1/2 in. (89 mm) thick concrete
Steel Deck - Min. 1 5/16 in. (34 mm) deep 24 ga. corrugated steel deck
Structural Members - Steel bar joists spaced max. 48 in. (1219 mm) OC
  • Floor Substrate - Min. 3-1/2 in. (89 mm) thick concrete
  • Steel Deck - Min. 1 5/16 in. (34 mm) deep 24 ga. corrugated steel deck
  • Structural Members - Steel bar joists spaced max. 48 in. (1219 mm) OC
  • Ceiling Support - Suspension system
  • Finished Ceiling - 5/8 in. (16 mm) thick 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 G525 ·