A fixed storefront lite has exposed area over 9 sf, its bottom edge is 12 in. above the floor, its top edge is above 36 in., and a walking surface is within 36 in. horizontally. What IBC glazing condition is met?
Correct Answer
A) A hazardous location requiring safety glazing
IBC 2406 identifies large fixed or operable glazing as hazardous where the pane exceeds 9 sf, bottom edge is less than 18 in. above the floor, top edge is more than 36 in. above the floor, and a walking surface is within 36 in. horizontally. Other choices ignore the four-part hazardous-location test.
Why This Is the Correct Answer
IBC 2406 identifies large fixed or operable glazing as hazardous where the pane exceeds 9 sf, bottom edge is less than 18 in. above the floor, top edge is more than 36 in. above the floor, and a walking surface is within 36 in. horizontally. Other choices ignore the four-part hazardous-location test.
Why the Other Options Are Wrong
Option B: Base the large fixed glazing safety trigger response on skylight glazing
Choice B (Only skylight glazing) is rejected because the action skips the timing, documentation, or field-control step needed for Large fixed glazing safety trigger.
Option C: Classify the condition as a nonhazardous display case exception
In doors, windows, and glazing, A nonhazardous display case exception is the wrong selection for Large fixed glazing safety trigger: it leaves out the controlling Large fixed glazing safety trigger result: A hazardous location requiring safety glazing.
Option D: Limit large fixed glazing safety trigger to fire-rated glazing
The trap in D is Only fire-rated glazing. That selection is wrong because it leaves the work at an informal or incomplete stage, while Large fixed glazing safety trigger requires A hazardous location requiring safety glazing; Large fixed glazing meeting the 9 sf, 18 in.
Memory Technique
Use a switch memory cue for large fixed glazing safety trigger: the stem's condition unlocks A hazardous location requiring safety glazing.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 2406.4.3 glazing in windows to confirm that IBC 2406 identifies large fixed or operable glazing as hazardous where the pane exceeds 9 sf, bottom edge is less than 18 in.
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