What is the minimum tread depth required for residential stairs under Oregon building codes?
Correct Answer
A) 10 inches
Oregon building code requires a minimum tread depth of 10 inches for residential stairs.
Why This Is the Correct Answer
Oregon building code requires a minimum tread depth of 10 inches for residential stairs. This matches the IRC requirement and ensures safe foot placement on each step.
Why the Other Options Are Wrong
Option B: 11 inches
11 inches exceeds the minimum required tread depth. While a deeper tread is more comfortable, the code only mandates 10 inches as the floor.
Option C: 12 inches
12 inches is well above the minimum tread depth. This is a generous tread size used in some commercial or custom residential applications but is not the code minimum.
Option D: 9 inches
9 inches is below the code minimum. A tread depth of only 9 inches would be dangerously shallow and fails to meet Oregon's adopted IRC stair requirements.
Memory Technique
Remember '10 toes, 10 inches.' You plant 10 toes on the tread, and the minimum is 10 inches deep. It's a one-to-one mnemonic: 10 = 10.
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