Architectural · A-QA6HB

First Floor Stair Riser Steel Framing Detail

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This stair assembly rests on the first floor level, anchored by an eight-inch steel channel and a three-inch steel channel sized per structural drawings. A five-inch plywood sleeper extends one inch beyond adjacent joists, supporting a one-half-inch plywood subfloor. Lag screws spaced at sixteen inches on center align with the joists to secure the framing. Two-inch treads and risers form the stair configuration, aligned with the bend point of the adjacent wall. Finish plans dictate the final floor coverings and wood layout.

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