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UL P561
Steel C-Joist (Load-Bearing)
| Fire Rating | 2 hours |
| System STC | n/a |
| System IIC | null |
| System Thickness | Varies |
Assembly Construction
Assembly Construction
Layer 1 - Roof Covering:
1 layer Ballasted, adhered or mechanically attached to the Insulation; Hot-mopped or cold-application, Class A, B or C Covering or Single-Ply Membrane
Layer 2 - Roofing Membrane:
1 layer Single-Ply Membrane: Ballasted, adhered or mechanically attached to Structural Cement-Fiber Units
Layer 3 - Structural Cement-Fiber Units:
1 layer 3/4" Thick, USG Structural Panel Concrete Subfloor (USGSP), with long edges tongue and grooved, long dimension of panels to be perpendicular to Joists (UL Type USGSP)
Layer 4 - Steel Joists:
1 layer 10" Deep, 16ga., Spaced 24" Max. O.C.
Layer 5 - Clip Angles (Not Shown):
1 layer One Clip Angle per Joist End
Layer 6 - Air Space:
1 layer 4" Min. between bottom flange of Joist and Main Runners
Layer 7 - Insulation:
1 layer 3-1/2" Thick Glass Fiber Batt Insulation
Layer 8 - Steel Framing Members:
1 layer Listed Below (UL Type DGL):
Layer 9 - Main Runners:
1 layer 4' O.C. Main Runners suspended by 12ga. Min. Hanger Wire, 24" O.C.
Layer 10 - Cross Tees:
1 layer 16" O.C.
Layer 11 - Cross Channels:
1 layer 16" O.C.
Layer 12 - Gypsum Panel:
1 layer 5/8" [15.9 mm] Sheetrock® EcoSmart Gypsum Panel (UL Type ULIX™)
Notes