Mecklenburg County Common Code Defects Residential Building Code Defects Over notching of load bearing studs for installation of mechanical components. Code Description Section R 602.6 Drilling and Notching Studs Any stud in an exterior or bearing wall may be cut or notched to a depth not exceeding 25% of its width (7/8” for 2x4 and 1-3/8” for 2x6). Studs in nonbearing location may be notched 40% (2X4= 1-3/8”, 2X6= 2-3/16”) of its width. Any stud may be bored or drilled, provided the diameter of the resulting hole is no greater than 40% of the stud width and no closer than 5/8” to an edge. The hole must not be in a notched section of the stud. Possible Options: 1. Doubled studs allow a bored hole to be up to 60% (2X4= 2-1/8”, 2X6= 3-5/16) of the stud width providing not more than 2 successive studs are modified. 2. Notching can be increased to 65% (2X4= 2-1/4”, 2X6= 3-9/16”)of the stud width if the stud is reinforced with ½” plywood on one side from floor to ceiling and 1 stud past modified stud on each side. 3. Stud may be repaired using an approved stud shoe with in manufacture’s guidelines. Disclaimer: There may be other ways to comply with the Code. If so, you are not required to use this method to comply with the Code. You may want to investigate other options, or consult with a design professional identifying an equally code compliant solution.