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Define Tread Depth and Consistency — Determine the Tread Depth

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How to Measure and Plan Treads for a Split-Level Staircase · Step 5 of 8

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The minimum depth for any stair tread is 9 inches, which is the area where the foot is placed. This measurement is taken from the nosing of the tread above to the nosing of the tread below, rather than from the back of the riser to the nosing. Similar to risers, treads must maintain consistency in depth across a flight, with a maximum allowable variance of 3/8 inch. For optimal comfort and safety, the sum of one riser height and one tread depth should ideally be around 17 inches.

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