Would it be advisable to cut a 4" hole on the basement rim joist to install a bathroom fan. The joist size is 8" and is supported by a basement wall.

  • Hello, and welcome to Home Improvement. Good question; keep 'em coming! – Daniel Griscom May 17 at 17:13

Sure, you can drill a large hole in a rim joist, provided there isn’t a large post directly above the hole.

Loads will be “transferred” around the opening, whether the rim joist is parallel or perpendicular to the joists.

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    There are rules about hole size and placement of holes* in relationship to joist size that might be valuable info for future readers who are not knowledgeable about these things. It could be helpful to include that info in this answer. – Alaska Man May 17 at 17:45
  • @Alaskaman The reference to hole size you mention is for members in bending, (i.e.: joists, beams, etc.) – Lee Sam May 17 at 18:13

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