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[BS] 302.3.3 Bored Holes
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The diameter of bored holes in
wood studs shall not exceed 40 percent of the stud depth.
The diameter of bored holes in wood studs shall not
exceed 60 percent of the stud depth in nonbearing partitions.
The diameter of bored holes in wood studs shall not
exceed 60 percent of the stud depth in any wall where each
stud is doubled, provided that not more than two such successive
doubled studs are so bored. The edge of the bored
hole shall be not closer than 5/8 inch (15.9 mm) to the edge
of the stud. Bored holes shall be not located at the same
section of stud as a cut or notch.
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