New openings in existing concrete or masonry require core drilling six-inch diameter holes in each corner prior to sawcutting to avoid overcutting corners. The remaining corner material is chipped out by hand to achieve a clean square opening. Nondestructive testing must locate existing reinforcing bars prior to cutting, and all opening locations require review and approval by the structural engineer of record.
DO NOT OVERCUT CORNERS, SAWCUT ONLY TO CORED HOLES (N) OPENING IN (E) CONC OR MASONRY CORE 6" DIA HOLE IN EA CORNER OF OPNG PRIOR TO SAWCUTTING OPNG CHIP OUT CORNER FOR SQUARE OPNG NOTES: 1. ALL OPENING LOCATIONS SHALL BE REVIEWED AND APPROVED BY THE SEOR PRIOR TO CORING. 2. PROVIDE NONDESTRUCTIVE TESTING TO DETERMINE THE LOCATION OF (E) REINFORCING BARS PRIOR TO THE CUTTING OF (N) HOLES. LOCATE THE (N) OPENING IN SUCH A MATTER TO AVOID CONTACT WITH (E) REINFORCING.
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