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UL P562

Steel C-Joist (Load-Bearing)

Fire Rating 1 hours
System STC n/a
System IIC null
System Thickness Varies

Assembly Construction

Assembly Construction

Layer 1 - Roofing Membrane:

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 - Roof Insulation:

1 layer Polyisocyanurate Insulation Boards, 1" Thickness Min. with no limit on Max. Overall Thickness. Loosely laid, adhered or mechanically fastened to the Gypsum Sheathing and Structural Cement-Fiber

Layer 3 - Gypsum Board:

1 layer 1/2" Thick Min., Loosely laid, adhered or mechanically attached to Structural Cement-Fiber Units (UL Type FRX-G)

Layer 4 - 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 5 - Steel Joists:

1 layer 10" Deep, 16ga., Spaced 24" Max. O.C.

Layer 6 - Clip Angles (Not Shown):

1 layer One Clip Angle per Joist End

Layer 7 - Joist Bridging (Not Shown):

1 layer V-Bracing of 1-1/2", 20ga., Galvanized Steel between Channels

Layer 8 - Insulation:

1 layer 3-1/2" Thick Glass Fiber Batt Insulation

Layer 9 - 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):

Layer 10 - Main Runners:

1 layer 4' O.C. Main Runners suspended by 12ga. Min. Hanger Wire, 16" O.C.

Layer 11 - Cross Tees:

1 layer 16" O.C.

Layer 12 - Cross Channels:

1 layer 16" O.C.

Layer 13 - Gypsum Panel:

1 layer 5/8" [15.9 mm] Sheetrock® EcoSmart Gypsum Panel (UL Type ULIX™)


  • 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.