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Determine Tread Overhang and Length — Calculate Tread Depth and Nosing

Beginner2 hours

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How to Measure Alternating Tread Stairs · Step 4 of 10

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Determine the exact dimensions of the treads, considering a minimum run of 10 inches and an acceptable overhang (e.g., 3/4 inch to 1 1/4 inches). If using 2x12 lumber for treads (actual width typically 11 1/4 inches), a 10 1/4 inch run will allow for a 3/4 inch overhang. This overhang, often called the nosing, adds to comfort and aesthetics. Note that the riser board thickness is factored into the total run.

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