On 5/27/2015 2:26 PM, Bob wrote:
An electrician drilled a one-inch diameter hole in my house's rim joist
while adding a new circuit. A half inch hole is sufficient to pull the
romex through but a larger hole is more convenient for him to insert a
conduit fitting into the sheet rock at the end of the hole.

Would this one inch hole significantly weaken the rim joist? Should I
fill it with epoxy or something?

There is a simple rule to apply when drilling in joists. Generally,
drill holes with a diameter of no more than one-third the depth of the
joist, staying 2 in. away from the top and bottom if it's a dimensional
lumber joist. Therefore, if you have a 2 x 12 joist, your max is 3 3/4"
hole. The 1" hole is fine as long as it's not within the 2" from top or
bottom.

If you have manufactured I-joists, you can drill holes up to 1-1/2 in.
diameter almost anywhere in the web area (the area between the flanges).
Just stay 6 in. away from any end or load-bearing wall.

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