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USG Structural Panels System Performance

 

Fire-Resistant-Rated Systems

System Hour Rating UL Design Highlights
Floor/Ceiling 1 hour G556
  • Min 6” C-joist, bare USGSP allows for variety of floor finishes
  • Without affecting fire-resistance
Floor/Ceiling 2 hour H505
  • Min 8” C-joist, bare USGSP allows for variety of floor finishes
  • Without affecting fire-resistance
Roof/Ceiling 1 hour P561
  • No Thermal Barrier needed – Saves Time
Roof/Ceiling 2 hour P573
  • 48” O.C. Joist Spacing
  • No Thermal Barrier needed
  • The only noncombustible nail base for shingle applications
Modular System 2 hour H501
  • The only noncombustible floor/ceiling assembly for modular assemblies.

 

Subfloor Systems – Acoustical Performance

UL Designa Hour Rating Floor Finish Underlayment Channel Type USG Sheetrock® Brand Firecode® C Core STC/FSTC IIF/FIIC
G556 (1 hour) Carpet & Pad RC-1 5/8 in. – 1 layer 56 65
G556 (2 hours) Carpet & Pad USG Levelrock® DWSSd 5/8 in. – 1 layer 60b 79b
G556 (2 hours) Engineered Wood USG Fiberock® DWSSd 5/8 in. – 1 layer 62b 53–56b
G556 (2 hours) Ceramic Tile USG Fiberock® DWSSd 5/8 in. – 1 layer 56–61b 52–59b
G556 (2 hours) Carpet & Pad RC-1 5/8 in. – 2 layers 57b 68–69b

(a) Designs use USG Structural Panel Concrete Subfloor.
(b) FSTC / FIIC are field acoustical tests in accordance with ASTM and ASTM E1004.
(c) USG Durock Brand Tile Membrane and an acoustical mat are to be used as part of the underlayment system.
(d) DWSS: Drywall suspension system.