A depressed concrete slab on grade transitions to a standard slab thickness with a maximum depression of four inches. When the depression depth exceeds two inches, continuous reinforcing bars require a ninety-degree hook with development length specified as six times the thickness or eighteen inches minimum. A companion detail features a thickened slab edge extending twelve inches minimum below finished grade or paving, with an eight-inch minimum width, a one-to-one sloped haunch, and two continuous number four reinforcing bars with ninety-degree corner hooks.
DEPRESSION "t" 4" MAX FIN GRADE OR PAVING SEE PLANS 2-#4 CONT PROVIDE 90° HOOK WHERE "t" EXCEEDS 2" MIN 8" 1'-6" MIN 6t OR MIN 12" 1 1 SLAB ON GRADE PER PLAN SLAB ON GRADE PER PLAN DEPRESSED SLAB DETAIL SLAB EDGE DETAIL 7B 7A DEPRESSED SLAB ON GRADE AND SLAB EDGE 7
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