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Roof Framing or Truss-to-Top-Plate Restraint

Uplift refers to the forces that can lift a structure. The forces are generated when high winds blow over the top of the structure, creating suction that can lift the roof. These uplift forces must be transferred down to the foundation to prevent damage. Several connections are required to create a continuous load path, starting with a hurricane tie or structural fastener connecting the roof framing to the top plates.

For additional information, the Simpson Strong-Tie High Wind Guide (F-C-HWG) offers a variety of options to resist roof uplift forces.

F-C-HWRCAG16 – High Wind-Resistant Construction Application Guide
F-C-HWG – High Wind Guide: A Guide to Select Connections in High Wind Places
Get the Guide
Truss-to-Top Plate
Blocking and stud-to-plate connector not shown for clarity.
AC391 Criteria Section AC391 Requirement
  • Use of continuous rod tiedown runs (CRTR) and continuous rod tiedown systems (CRTS) is limited to resisting roof wind uplift in light-frame wood construction.
  • Specifically excluded from AC391 is the use of CRTR to resist shearwall overturning forces or use in cold-formed steel framing.