Joe,
Here is a quote from the 2006 IRC on drilling and notching of studs:
Quote:
R602.6 Drilling and notching–studs. Drilling and notching
of studs shall be in accordance with the following:
1. Notching. Any stud in an exterior wall or bearing partition
may be cut or notched to a depth not exceeding 25
percent of its width. Studs in nonbearing partitions may
be notched to a depth not to exceed 40 percent of a single
stud width.
2. Drilling. Any stud may be bored or drilled, provided that
the diameter of the resulting hole is no more than 60 percent
of the stud width, the edge of the hole is no more
than 5/8 inch (16 mm) to the edge of the stud, and the hole
is not located in the same section as a cut or notch. Studs
located in exterior walls or bearing partitions drilled over
40 percent and up to 60 percent shall also be doubled
with no more than two successive doubled studs bored.
See Figures R602.6(1) and R602.6(2).
Exception: Use of approved stud shoes is permitted
when they are installed in accordance with the manufacturer’s
recommendations.
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Chris
Drilling & Notching Framing Members
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