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USG Structural Panels System Performance
Fire-Resistant-Rated Systems
| System | Hour Rating | UL Design | Highlights |
|---|---|---|---|
| Floor/Ceiling | 1 hour | G556 |
|
| Floor/Ceiling | 2 hour | H505 |
|
| Roof/Ceiling | 1 hour | P561 |
|
| Roof/Ceiling | 2 hour | P573 |
|
| Modular System | 2 hour | H501 |
|
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.