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TBD Diagonal Brace


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Roof Truss and Rafter Connectors, Ties, and Straps

This product's information may differ depending on the category of use. You are currently viewing details related to Roof Truss and Rafter Connectors, Ties, and Straps. You can also view product information related to the category: Spacing, Restraint and Bracing Products

The TBD22 diagonal truss brace offers a time-saving substitute for hat channel or C-stud diagonal bracing that helps meet the prescriptive recommendations of CFSBCSI. The TBD22 travels in a box like a flat strap (160 feet per carton), and is formed into an A-shape as it is pulled from the carton to provide rigidity and prevent sagging between trusses during installation. As it is fastened to the trusses the brace flattens, allowing sheathing to be installed over it, saving the time typically needed to remove bracing prior to applying the sheathing or decking.

Key Features

  • Helps meet prescriptive temporary bracing recommendations of the WTCA/TPI BCSI
  • Rigid A-shape design virtually eliminates sagging between trusses spaced 16"–24" on center
  • Can be sheathed over after installation, no need to remove bracing
  • Dimpled nailing grid allows installation with standard pneumatic fasteners
  • 160' of bracing in an easy-to-handle carton


  • 22 ga. (27 mil)


  • Galvanized


  • Use all specified fasteners; see General Notes.
  • Strap does not have holes for fasteners. Screws shall be installed in the dimpled areas and placed to maintain a minimum of 1/4" strap edge distance and a minimum of 1/2" center-to-center distance.
  • TBD22 strap span diagonally at approximately 45°.
  • Strap shall not be slack, but tight and ready to engage in tension.
  • To resist construction forces, diagonal X-bracing is required at each end and every 10 truss spaces (20' max.). Refer to SBCA CFS-BCSI for additional information.
  • At the end of the TBD22 braces, trusses shall be laterally restrained to resist out-of-plane forces.
  • Bracing locations shown in the drawing are recommendations for temporary bracing only. Installation of TBD22 for permanent bracing shall be by the Building Designer or Engineer of Record.

Related Literature

Load Tables

Load table - TBD22 Truss Brace Diagonal
  1. Load based on truss steel properties of Fy = 50 ksi and Fu = 65 ksi. Reduce load directly proportionally for lower steel strength per AISI 2001 Chapter F, Section F1.1 (c).
  2. See more information on Simpson Strong-Tie fasteners.

Code Reports

Part IAPMO UES ER ICC-ES ESR City of Los Angeles State of Florida
TBD22 ER-102 ER-124 RR25489 FL13872


Part Orthographic Perspective
TBD22 Perspective View