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UL G556
Steel C-Joist (Load-Bearing)
| Fire Rating | 2 hours |
| System STC | n/a |
| System IIC | n/a |
| System Thickness | Varies |
Assembly Construction
Assembly Construction
Layer 1 - Subfloor Topping Mixture:
1 layer 3/4" Thick Levelrock® Brand 4500 Series Floor Underlayments
Layer 2 - Sound Mat (Optional):
1 layer 1/4" Thick Levelrock® Brand SRM-25™ Ready Seam™ Sound Reduction Mat
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 Channel-Shaped, 10" Deep Min., 16 Ga., Spaced 24" Max. O.C.
Layer 5 - Clip Angles (Not Shown):
1 layer One Clip Angle Per Joist End; One Clip Angle per Joist End
Layer 6 - Joist Bridging (Not Shown):
1 layer V-Bracing of 1-1/2", 20 Ga., Galvanized Steel Between Channels
Layer 7 - Insulation:
1 layer 3-5/8" Thick Glass Fiber Batt Insulation
Layer 8 - Steel Framing Members:
1 layer Suspension System May be Used in Lieu of the Resilient Channels. Main Runners, Cross Tees, Cross Channels and Wall Angle as Listed Below (UL Type DGL):; Suspension System May be Used in Lieu of the Resilient Channels. Main Runners, Cross Tees, Cross Channels and Wall Angle as Listed Below (UL Type DGL):
Layer 9 - Main Runners:
1 layer 4' O.C. Main Runners Suspended by 12 ga. Min. Hanger Wire, 16" O.C.
Layer 10 - Cross Tees:
1 layer 16" O.C.
Layer 11 - Cross Channels:
1 layer 16" O.C.
Layer 12 - Wall Angle or Channel:
1 layer Painted or Galvanized Steel Angle to Support Steel Framing Member Ends and for Screw-Attachment of the Gypsum Panel (UL Type DGL)
Layer 13 - Gypsum Panel:
1 layer 5/8" [15.9 mm] Sheetrock® EcoSmart Gypsum Panel (UL Type ULIX™)
Notes
- For the most up-to-date fire-resistance ratings, refer to the UL Online Certifications Directory.
- Estimated range of acoustical performance is based on laboratory test data of similarly constructed assemblies.