A new accessible entrance threshold is installed at 3/4 in. high with an abrupt vertical face. What is the correct field response?
Correct Answer
B) Correct the threshold to the new-construction height and bevel requirements
New accessible thresholds are limited to 1/2 in. maximum, with beveling above 1/4 in.; a 3/4 in. abrupt threshold is not acceptable for new construction. Other choices misuse an existing-threshold allowance or create a trip condition.
Why This Is the Correct Answer
New accessible thresholds are limited to 1/2 in. maximum, with beveling above 1/4 in.; a 3/4 in. abrupt threshold is not acceptable for new construction. Other choices misuse an existing-threshold allowance or create a trip condition.
Why the Other Options Are Wrong
Option A: Accept it because 3/4 in. is allowed for every new threshold
Choice A gives Accept it because 3/4 in. is allowed for every new threshold. Its specific error: Accept it because 3/4 in. is allowed for every new threshold is a different published number than the cited Threshold accessibility value; ICC A117.1-2017 Section 404.2.5 thresholds supports Correct the threshold to the new-construction height and bevel requirements.
Option C: Add a mat on one side, leaving the threshold and leave threshold accessibility unverified
In doors, windows, and glazing, Add a mat on one side and leave the threshold is the wrong selection for Threshold accessibility: the choice would not get the project to Correct the threshold to the new-construction height and bevel requirements, which is the Threshold accessibility result verified by the source.
Option D: Label the entrance as accessible only for staff and leave threshold accessibility unchecked
The trap in D is Label the entrance as accessible only for staff. That selection is wrong because it leaves the work at an informal or incomplete stage, while Threshold accessibility requires Correct the threshold to the new-construction height and bevel requirements; New accessible thresholds must meet the 1/2 in.
Memory Technique
Use the phrase "problem, control, result" for threshold accessibility; the result side is Correct the threshold to the new-construction height and bevel requirements.
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 New accessible thresholds are limited to 1/2 in.
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