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Fire Rated System Design - GA-FC-4750

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GA-FC-4750

Steel C-Joist

Fire Rating

hour

Restrained‐2 hour


STC / Sound Test

N/A

System Thickness

N/A

Fire Rating

Unrestrained‐2 hour

System Thickness

N/A

Floor Substrate - 3/4 in. (19 mm) tongue and groove plywood
Structural Members - Min. 8 in. (203 mm) deep 18 ga. steel C-Joists max. 24 in. (609 mm) OC
Ceiling Support - Furring channels spaced max. 24 in. (609 mm) OC
  • Floor Underlayment (optional) - Min. 3/4 in. (19 mm) thick, min. compressive strength 1800 psi
  • Floor Substrate - 3/4 in. (19 mm) tongue and groove plywood
  • Structural Members - Min. 8 in. (203 mm) deep 18 ga. steel C-Joists max. 24 in. (609 mm) OC
  • Gypsum Board - Three layers of 5/8 in. (16 mm) thick gypsum board
  • Ceiling Support - Furring channels spaced max. 24 in. (609 mm) OC
  • Finished Ceiling - 5/8 in. (16 mm) thick gypsum board
Remarks
  • Stud size is minimum unless otherwise stated in design.