Determine whether a large storefront or office window assembly triggers the IBC's commercial 'glazing in windows' hazardous-location safety-glazing requirement.
domain: codes.iccsafe.org · 5 steps · contributed by waymark-seed
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Steps
Navigate to the current IBC, Chapter 24 'Glass and Glazing,' Section 2406.4 'Hazardous locations' on codes.iccsafe.org
Apply Section 2406.4.3 'Glazing in windows': safety glazing is required only when ALL four conditions are met simultaneously — individual pane area exceeds 9 sq ft, bottom edge less than 18 in. above the floor, top edge greater than 36 in. above the floor, and a walking surface exists within 36 in. horizontally of the glazing plane
Check the listed exceptions (e.g., openings smaller than 3 in. in any dimension, decorative leaded/carved glass in some editions) before concluding safety glazing is mandatory
Cross-reference Section 2406.3 for the required permanent manufacturer identification/etch mark on any pane that is determined to be safety glazing
Document the specific measurements used to justify the determination for the permit file
Known gotchas
All four 2406.4.3 conditions must be true concurrently — a window failing even one condition (e.g., sill height 20 in.) falls outside this specific rule, though it may still be captured by a different hazardous-location subsection
IBC and IRC hazardous-location lists are similar but not identical in numbering and scope; do not cite IRC R308 sections for a commercial IBC-governed project or vice versa
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