- Q.I need to run wires through
Boise Cascade I-joists. The joists come with prepunched
holes, but the holes don’t line up.
I’d like to drill some 1-inch holes in the
joist webs. Are there any limitations on where these
holes can be drilled?
A.Kevin Pelletier, sales
representative for Wood Structures Inc., a Boise
Cascade distributor in Biddeford, Maine,
responds: A hole up to 1 1/2 inches in
diameter can be drilled anywhere in the web of a
BCI joist, as long as it is located at a distance
equal to at least two diameters away from any other
hole. In other words, a 1-inch hole needs to be at
least 2 inches away from any other hole.