In question number 8 of Gang Chen's mock exam regarding handrails, the question asks:
According to IBC, which is true at stairways where handrails are not continuous between flights?
I selected b) handrails shall extend 12" beyond top riser and continue to slope for depth of one tread plus 12" beyond bottom riser.
The correct answer is a) same answer as above MINUS the 12" extension. Just says that handrail is to extend the depth of one tread past bottom riser.
Does anyone know when to use the 12" horizontal extension in addition to the depth of one tread at the bottom of the stair and when to not use it? My understanding was that answer a) applies to residential only and answer b) applies to commercial but the question says "according to IBC...", which implies commercial. Can anyone shed some light?
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