TB-320: Addressing 2024 IRC, Section 502.11 - Floor edge framing supporting Guards using Weyerhaeuser SCL

As more jurisdictions adopt the 2024 International Residential Code (IRC), questions around the new section, R502.11: Floor framing supporting guards, are becoming more frequent, particularly where engineered wood products (EWP) are involved.

To help address these questions consistently, Weyerhaeuser Technical Bulletin TB‑320 provides design guidance for using Weyerhaeuser structural composite lumber (SCL) as edge framing members supporting interior guards, in a manner that satisfies the intent of Section R502.11 of the 2024 IRC.

Key Takeaways

• This code change is designed to address potential life-safety issues regarding the strength of guard connections.
• A guard is a building component or a system of building components located near the open sides of elevated walking surfaces that minimizes the possibility of a fall from the walking surface to the lower level. 
• TB‑320 applies to interior guard applications only.
• TJI® Joists are not recommended as edge framing members.
• Continuous load paths are essential: Guard support loads must be transferred through the edge member, roll bracing, and into the supporting floor system. 
• Details matter: Blocking configuration, fastener types and spacing, and sheathing attachment all play a role in meeting the intent of the code.
• If a jurisdiction is asking questions about guard attachment under the 2024 IRC, referencing TB‑320 early—during plan review—can help avoid delays in the field.

For questions on applicability of framing conditions, contact your Weyerhaeuser representative or technical support team.