Concrete-filled twelve-gauge steel stair pans feature a one-inch nosing return and a finishing edge angle tack-welded to the pan one inch shorter than the tread. The pans are supported by channel stringers with a bottom clip angle secured to the floor slab using a five-eighths-inch diameter anchor bolt and a quarter-inch end closure. An access hole is provided in the stair pan.
1/4" END CLOSURE ACCESS HOLE IN STAIR PAN 1 1/2" DEEP CONC FILLED 12ga STAIR PANS 1" NOSING RETURN L3x3 CLIP INSIDE BOT RISER 5/8"Ø K. BOLT TO FLOOR SLAB C12x20.7 STAIR STRINGER 1/8 2-12 1/8 2-12 1 1/4" ± 1" 11" 7" ± 3" L 1 1/2" x 1 1/2" x 3/16 FINISHING EDGE. 1" SHORTER THAN TREAD. TACK WELD TO STAIR PAN.
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