Direct Answer
Steel stair fabrication requires close attention to the architectural drawings (which define tread/riser dimensions and finish), IBC requirements (minimum width, handrail height, stringer depth), and the interface with the building structure (connection to landing beams, anchor requirements at slab). Steel stairs are labor-intensive, requiring precise layout and fitting of stringers, tread supports, and handrail connections.
Full Explanation
IBC stair requirements: minimum width 44" (commercial), maximum riser height 7", minimum tread depth 11", handrail heights 34"–38" above nosing. Stair types: pan stairs (concrete-filled metal pans supported by stringers), open-riser stairs (structural plate treads or bar grating), and prefabricated steel stairs. The stringer is typically a C-channel or fabricated plate girder with tread plates welded to vertical angles. Handrail must meet IBC Section 1014 requirements including 42" guard rail for open sides. Coordinate all landing connections with the structural drawings before fabricating.
What This Means for Your Shop
Steel stairs are typically on the critical path for finishing trades — if stairs aren't installed, upper floors can't be accessed. But they're also among the last items designed by the architect. This creates a 'late design, early need' conflict that must be managed aggressively.
Common Mistakes
Fabricating stairs from architectural drawings before structural landing beam locations are confirmed. Stair stringers must match the exact structural connection point — an inch of misalignment on a landing beam makes the stair unusable.
Recommended Process
Hold a coordination meeting specifically for stairs: review the architectural stair layout, confirm landing beam locations from structural, confirm finish requirements, and verify all dimensions before releasing to fabrication.