Where spacing of openings is less than three times the diameter, effective opening outlines enclose grouped penetrations requiring one number five top and bottom added trim bar all around, extending one foot six inches beyond the effective opening each side without diagonal bars. Minimum dimensions and spacing parameters govern effective opening boundaries for various diameter configurations in reinforced concrete floor and roof slabs.
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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