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Workgroup accepts reorganization of multiplex provisions; tightens egress and fire-resistance language

Building Code Council — Single-exit / Multiplex housing workgroup · December 18, 2025

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Summary

The council workgroup voted to accept a reorganized multiplex (up to six-unit) appendix consolidating fire-resistance assemblies, opening protectives, and detailed means-of-egress rules (36-inch minimum width, 125-foot travel distance). Members approved posting illustrative figures and will finalize remaining editorial items at the next meeting.

The Building Code Council’s workgroup voted Dec. 16 to accept a reorganization of multiplex code language that consolidates fire-resistance-rated assemblies, opening protectives, and means-of-egress rules into a new, unified section.

John, who presented the reorganization, explained the change would move all fire-resistance and opening-protector requirements into a single section (102.1) and add pointers to relevant International Building Code provisions, including prescriptive fire-resistance assemblies and labeling/testing requirements. "This whole section is new on opening protectives," John said while explaining the label and testing expectations for doors and smoke/draft assemblies.

The reorganization also specifies egress continuity for six-plex buildings, requiring a minimum egress width of 36 inches and limiting travel distance to 125 feet so occupants can reach the public way rather than just the front door. The proposal clarifies when corridors, interior and exterior exit stairs, and exit passageways may be used, and it sets minimum fire-resistance ratings for dwelling-unit and common-use separations.

After discussion and a motion to accept the reorganization, the workgroup approved the concept by voice vote and separately approved including illustrative figures to aid designers and inspectors. Staff will post the revised baseline document and figures for public review; the group scheduled a follow-up meeting to resolve remaining editorial items and to forward the recommendation to the BFRW for its Jan. 16 meeting.