Simpson Tie for Roof Rafter: A Comprehensive Guide

When it comes to building a sturdy roof frame, Simpson Strong-Tie RR Galvanized Ridge Rafter Connector is an essential component. This connector provides support underneath the joist, rafter or beam, ensuring a strong connection between the structural elements.

The Simpson Strong-Tie RR connector is designed to work in conjunction with fasteners, such as nails or screws, to provide added stability and strength to the roof frame. In particular, using the Strong-Drive SD Connector (SD9212) for 0.131” x 2 1/2” (and longer) can achieve the same load-carrying capacity as nails.

For general fastener information, refer to Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors. The connector is available with various fasteners, including SCNR nails, which come in paper-collated strips or bulk packs for hand-drive fastening.

The allowable DF/SP/SPF uplift load of the H2.5A fastened to a 2x4 truss bottom chord and double top plates using (5) 0.131' x 1 1/2' nails in the top plates and (3) 0.131' x 1 1/2' nails in the lowest three flange holes into the truss bottom chord is 260 lb. Additionally, Southern pine allowable uplift loads for the H2.5A with 0.131' X 1 1/2' nails are 635 lb.

The article highlights the importance of considering cross-grain bending or tension forces when designing a roof frame. It also emphasizes the need for mechanical reinforcement to resist such forces, especially in members where cross-grain bending or tension cannot be avoided.

Furthermore, it is essential to note that allowable loads in the F1 direction are not intended to replace diaphragm boundary members and do not account for possible cross-grain bending of truss or rafter members. For SPF/ HF values, multiply these values by 0.86.

In terms of stud-to-bottom plate installation (see detail 12), the allowable DF/SP uplift load is 390 lb. Moreover, a minimum rafter thickness of 2 1/2' must be used when framing anchors are used on each side of the joist and on the same side of the plate.

Lastly, it's worth mentioning that Simpson Strong-Tie connectors are available with additional corrosion protection for use in environments where exposure to moisture or other corrosive agents is a concern. For more information on fasteners, including stainless-steel options, refer to Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

In conclusion, the Simpson Tie for Roof Rafter is an essential component of a sturdy roof frame, providing support underneath the joist, rafter or beam while ensuring a strong connection between structural elements. By following the guidelines outlined in this article and selecting the right fasteners, builders can create a safe and durable roofing system that withstands various environmental conditions.

Simson tie for roof rafter