The drawing shows a concrete slab-on-grade with a thickened section designed to support the concentrated loads from a stair stringer. Reinforcing steel includes #4 reinforcing bars spaced at 12 inches on center and additional #4 bars within the thickened slab zone. Dimensions indicate a 6-inch standard slab thickness and a thickened depression extending at least 2 feet past the stringer on each side.
Text on the drawing
12" #4 @ 12"O.C. 1 1 ADDITIONAL 3-#4 SLAB ON GRADE STAIR STRINGER PAST STRINGER EACH SIDE THICKEN SLAB 2'-0" MIN. 2'-0" 6" 11 N.T.S.
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