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|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|| |
|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.