A new accessible entrance door has a raised threshold. What maximum threshold height is allowed in new construction before considering existing-threshold exceptions?
Correct Answer
D) 1/2 in.
ICC A117.1/ADA door criteria limit thresholds at accessible doors to 1/2 in. maximum in new construction, with beveling required above 1/4 in. Other choices either understate the permitted maximum or use an existing-condition allowance.
Why This Is the Correct Answer
ICC A117.1/ADA door criteria limit thresholds at accessible doors to 1/2 in. maximum in new construction, with beveling required above 1/4 in. Other choices either understate the permitted maximum or use an existing-condition allowance.
Why the Other Options Are Wrong
Option A: 1/4 in.
Choice A gives 1/4 in. Its specific error: 1/4 in. is a different published number than the cited Accessible door threshold value; ICC A117.1-2017 Section 404.2.5 thresholds supports 1/2 in. The accepted answer is 1/2 in.
Option B: 3/4 in.
Choice B (3/4 in.) is rejected because 3/4 in. is a different published number than the cited Accessible door threshold value; ICC A117.1-2017 Section 404.2.5 thresholds supports 1/2 in. The cited answer is 1/2 in.
Option C: 1 in.
In doors, windows, and glazing, 1 in. is the wrong selection for Accessible door threshold: 1 in. is a different published number than the cited Accessible door threshold value; ICC A117.1-2017 Section 404.2.5 thresholds supports 1/2 in.
Memory Technique
File accessible door threshold under a weep path: condition first, number or duty second, answer 1/2 in.
Reference Hint
Open ICC A117.1-2017 Accessible and Usable Buildings and Facilities; use ICC A117.1-2017 Section 404.2.5 thresholds to confirm that ICC A117.1/ADA door criteria limit thresholds at accessible doors to 1/2 in.
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