Where the spacing of openings is less than three times the diameter, effective opening outlines govern the reinforcement layout. All indicated conditions require one number five top and bottom added trim bars all around the effective opening, extending one foot six inches beyond the effective opening on each side typically, while diagonal bars are not required.
WHERE SPACING OF OPENINGS IS < 3D OUTLINE OF EFFECTIVE OPENINGS, TYP. NOTE: 1. ALL ABOVE CONDITIONS REQUIRE 1#5T&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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