Galvanized steel bar grate stair treads are supported by galvanized angles measuring 1-1/2 inches by 1-1/2 inches by 1/8 inch extending the width of the landing on each side and welded to the channel stringer. A C12 x 20.7 galvanized channel serves as the stair stringer, framed alongside galvanized closure panels. All welded parts are specified to be galvanized after fabrication.
1" TYP. 7" MAX. 11" TYP. 1" NOTE: ALL WELDED PARTS TO BE GALVANIZED AFTER FABRICATION. C12 X 20.7 GALVANIZED STRINGER GALVANIZED L 1-1/2" X 1-1/2" X 1/8" X WIDTH OF LANDING EACH SIDE. WELD TO CHANNEL STINGER GALVANIZED CLOSURE PANELS GALVANIZED STEEL BAR GRATE STAIR THREADS, TYP.
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