Landscape · L-6XPP2

Concrete Exterior Stair Riser and Safety Scoring Details

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Cast-in-place concrete exterior stair assembly featuring a riser and tread profile, safety scoring at the nosing, and a compacted subgrade with aggregate base. The main stair section rests on a six-inch minimum typical subgrade with a twelve-inch minimum depth at footings and varies per grading plans. Riser and tread configurations are designated by specific ratios such as five-inch riser with sixteen-inch tread, six-inch riser with twelve-inch tread, or six-inch riser with fourteen-inch tread unless otherwise noted on the layout. The safety scoring detail provides one-quarter-inch wide grooves spaced at one-inch intervals typical near the edge, with a one-half-inch radius typical at the top of step and bottom of step nosings. Drainage is accommodated by a two percent maximum typical slope on treads and landings.

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