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Understanding Tread Depth and Nosing — Calculate Tread Depth and Nosing

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How to Measure Alternating Tread Stairs · Step 4 of 10

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The video uses a 3D animated model of a staircase to demonstrate how tread depth is measured. Starting with a 9-inch tread, it shows that while the structural tread might be 9 inches, additional length can be gained through nosing (an overhang). The presenter references the '2024 International Building Code - 1011.5.2 Riser Height and Tread Depth' to emphasize that these dimensions are governed by regulations. Examples are shown where adding an inch makes it a 10-inch step, and adding an additional 1.5 inches results in an 11.5-inch step. A warning is displayed: 'Long Nosing Can Create Trip Hazards', indicating that excessive overhang can compromise safety.

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