A rectangular opening in a concrete slab requires continuous perimeter reinforcement consisting of number four bars centered on all four sides with a minimum of two inches of clearance. Each corner receives an additional forty-eight inch long number four diagonal bar centered in place to control cracking.
OPENING TYP 2" CLR PROVIDE REINF ON ALL SIDES # 4 CTRD ALL SIDES MIN) #4 x 48" DIAG TYP AT EA CORNER, CTRD
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