An exterior steel stair framing plan details two C12x20.7 channel stringers spanning perpendicular to a concrete wall with an MC8x20 channel support member. L3x3x1/4 angles are spaced at three feet on center between the stringers to support the stair treads. A similar connection detail is indicated for anchoring the stair assembly to the concrete wall.
L3x3x1/4 @ 3'-0" OC O MC8x20 C12x20.7 C12x20.7 1 - SIM FOR CONNECTION TO CONC WALL 1 -
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