Under Oregon building codes, what is the minimum required landing depth at the top of a residential stairway?
Correct Answer
D) 36 inches
Oregon building code requires a minimum landing depth of 36 inches at the top of residential stairways, measured in the direction of travel.
Why This Is the Correct Answer
Oregon's Residential Specialty Code requires a minimum landing depth of 36 inches measured in the direction of travel at the top (and bottom) of a stairway. This ensures sufficient space for a person to land safely and open/close a door without being struck while on the landing.
Why the Other Options Are Wrong
Option A: 32 inches
32 inches is below the 36-inch minimum. While 32 inches approximates the width of a standard door, it does not satisfy Oregon's landing depth requirement. A 32-inch landing would not provide adequate space for someone to stand safely while operating a door at the top of the stairs.
Option B: 30 inches
30 inches is also below the minimum. Some students associate 30 inches with stair width or riser calculations, but it does not apply to landing depth requirements under Oregon's residential code.
Option C: 42 inches
42 inches exceeds the minimum requirement. While a 42-inch landing would certainly comply and is often seen in wider or luxury stair designs, it is not the minimum. Selecting 42 inches confuses a generous landing size with what the code mandates.
Memory Technique
Think '3 feet = 36 inches' for landings — a landing must be at least one yard (36") deep so you have room to stand without tumbling. A yardstick laid at the top of the stairs is your landing depth minimum.
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