Where the clear spacing of core or utility openings in a concrete slab is less than three times the diameter, a single number five top and bottom added trim bar is required all around the effective opening. These trim bars extend one foot six inches beyond the effective opening on each side, while diagonal corner bars are omitted. The effective opening outline encompasses closely spaced penetrations maintaining a minimum two-foot overall spacing dimension.
WHERE SPACING OF OPENINGS IS < 3D OUTLINE OF EFFECTIVE OPENINGS, TYP NOTE: 1. ALL ABOVE CONDITIONS REQUIRE (1)#5 T&B ADDED TRIM BARS ALL AROUND THE EFFECTIVE OPENING EXTENDING 1'-6" BEYOND THE EFFECTIVE OPENING EACH SIDE, TYP (DIAGONAL BARS ARE NOT REQUIRED) D(OR d) = OPENING DIAMETER d d >d >d d 2'-0" MIN TYP d TYP >d 2'-0" MIN D >D d >d d 2'-0" MIN . 1'-6"
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