Low-density expanded polystyrene bead board is provided one inch thick at the sides and three inches thick at the end where the casing is buried in concrete. A one-inch side clearance and three-inch end clearance are maintained between the casing and the concrete, measured relative to the top of concrete.
1" 3" 3" 1" 1" 3" 1" PROVIDE LOW-DENSITY EXPANDED POLYSTRENE (BEAD BOARD) 1" THICK AT SIDES & 3" THICK AT END WHERE BURIED IN CONC, TYP T.O.C. T.O.C. T.O.C. MAINTAIN 1" AT SIDE & 3" AT END CLEARANCE BETWEEN CASING & CONC, TYP THICKNESS, tg
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