How large a hole can be cut in a 2 x 2 1/2" joist lumber with 1/2" x 12" OSB web? I had a chart which indicated the farther from the bearing wall the larger the hole could be cut but I don't have it now.
I-joist drilling is based on manufacturers' proprietary requirements. You need to determine the brand and series of the I-joist you're using and look them up online. All major manufacturers publish this online.
There's no "one size fits all" answer. Normally, round holes can be pretty large, but proximity to bearing points and hole positioning in the span can be critical.
You can only drill the OSB web. Drilling or notching of the dimensional lumber flanges is completely prohibited.
Except for wiring, I have seen very few that lined up perfectly when a large hole is needed. Not that it matters, but I much prefer the open web joists.
In fact, instead of using the hammer, I'd recommend using a hole saw for those perforated holes.
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