The steel stair stringer is supported at the bottom by an L4x4x1/4-inch angle secured to a concrete apron with three-quarter-inch diameter expansion bolt anchors. McNichols 13-gauge pre-galvanized small hole plank grating with traction tread forms the stair treads alongside painted closed steel risers. A closure plate finishes the base of the stair assembly. A concrete footing is provided underneath if the stair is located in an unpaved area.
CONCRETE APRON L4x4x1/4" WITH 3/4" DIA. EXPANSION BOLT ANCHORS STRINGER - PAINTED CLOSED STEEL RISER PAINTED, TYP McNICHOLS: 13GA PRE-GALVANIZED "SMALL HOLE PLANK GRATING - TRACTION TREAD" PROVIDE FOOTING IF LOCATED IN UNPAVED AREA CLOSURE PLATE MAX. 7" 1' - 0" 1"
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