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TBD Diagonal Brace


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Spacing, Restraint and Bracing Products

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

The TBD22 diagonal truss brace offers a time-saving subsitute for 2x4 diagonal bracing that helps meet the recommendations of WTCA/TPI BCSI. The TBD travels in a box like a flat strap, 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 right over it and saving the time typically needed to remove 2x4 bracing.

When installed on the top and bottom chords as well as the web planes, the TBD captures the lateral construction and wind forces delivered by the TSBR truss spacer-restraints and transfers it diagonally in tension to the edge of the braced-truss system. When used in conjunction with the TSBR, the TBD22 meets or exceeds the recommendations set forth by the WTCA/TPI BCSI.

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. Nails 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. Nails should be installed in the center of the lumber narrow face and with a minimum edge distance of 1" on the lumber wide face.
  • TBD22 straps 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 WTCA/TPI BCSI for additional information.
  • At the end of the TBD braces trusses shall be laterally braced to resist out-of-plane forces.
  • Bracing locations shown in the drawing are recommendations for temporary bracing only. Installation of TBD braces for permanent lateral bracing shall be per the Building Designer.

Related Literature

Load Tables

TBD22 Diagonal Brace Load Table
  1. Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
  2. Minimum nailing meets or exceeds the temporary lateral-restraint recommendations of SBCA/TPI BCSI.
  3. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

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