text.skipToContent text.skipToNavigation

URS: Method 2 – Handling Deferred Submittals

For Designers who prefer their Simpson Strong-Tie® Strong-Rod™ Uplift Restraint System for Roofs (Strong-Rod URS) to be part of the deferred submittal process, a design in accordance with ICC-ES AC391 will be provided upon request that is compliant with ICC-ES Evaluation Report ESR-1161. Following the acceptance criteria requirements, the Strong-Rod URS is designed and detailed to:

  • Transfer wind uplift loads efficiently from wood framing to steel components in the rod run
  • Keep wood top-plate bending within acceptable limits
  • Control wood top-plate rotation
  • Limit steel rod elongation
  • Restrict crushing of wood top plates through the use of bearing plates
  • Address deflection caused by wood shrinkage

In order to provide a design, the following is needed:

  • Full set of structural and architectural drawings
  • An approved roof truss design package clearly indicating uplift demand loads, unless uplift is specified in the construction documents

Specification of a continuous rod tiedown system in accordance with AC391 is needed to ensure proper performance of the Strong-Rod URS. The following note should be placed within your construction documents or specification:

Continuous Rod Tiedown System for Roof Uplift Restraint

Contractor shall provide a continuous rod tiedown system (CRTS) to resist wind uplift possessing an ICC-ES evaluation report in accordance with ICC-ES AC391 (Acceptance Criteria #391 ICC-ES) recognizing the entire CRTS (including the wood framing elements), as opposed to recognizing only the steel components that compose continuous rod tiedown runs (CRTR). The entire CRTS shall be designed by a professional engineer registered in the state of the project. URS uplift rod run layout, component and detail drawings shall be submitted to the engineer of record (EOR) for review prior to construction.