New Technical Documents Explain Changes in the 2024 IRC and ANSI/TPI 1-2022

New Technical Changes for Truss Technicians and Designers to Know

SBCA has published two new technical documents which discuss impactful changes in the 2024 IRC and in ANSI/TPI 1-2022. It is important that component manufacturers (CMs), truss technicians, and truss designers understand these provisions, how they may impact floor and roof truss designs, and how to best incorporate the requirements in their designs.

The first new document is IRC Floor Framing Guard Assembly Support Recommendations (CSR No. 2601). Section R502.11 of the 2024 International Residential Code (IRC) includes new floor framing requirements and prescriptive solutions to ensure that lateral loads applied to the guards are adequately resisted. The new prescriptive solutions provided in the new code provision are limited to dimensional lumber. This new Code Summary Report provides prescriptive solutions for metal plate connected floor trusses that satisfy these new code requirements.

The second new document is ANSI/TPI 1-22 Person Loading Requirements (CSR No. 2504). ANSI/TPI 1-2022 has added a new person loading check in Section 6.2.2.5 to represent the occurrence of a person on the chord of a truss. The provision was introduced to enhance safety by ensuring that truss chords can support a worker during temporary in-service conditions, such as access for maintenance or installation activities. The TPI Technical Advisory Committee (TPI TAC) issued a Technical Interpretation for this new provision which clarified how it should be applied. It is important for truss technicians and truss designers to understand this provision, and the Technical Interpretation, and the potential impact it may have on truss designs. In some instances, the provision may control the design of a truss chord resulting in larger member sizes, or smaller panel lengths than previously required.

Both documents are available for download from:
SBCA's Knowledge Center