This concrete stair detail shows a reinforced concrete stair assembly supported on ninety percent compacted fill with a continuous concrete footing at the base. The stair slab features three-number reinforcing bars spaced at twelve inches on center each way, supplemented by three-number nosing bars at each tread edge. Two-number four reinforcing bars are detailed within the ten-inch minimum concrete footing. The assembly rests over subgrade with a one-foot-zero-inch minimum depth to the footing bottom, adjoining an exterior asphalt paving or concrete slab.
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