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enter image description hereI am looking to install two 4x8 overhead storage racks in my garage. Will I compromise the structural integrity of my i-joist, that is, 2"wide × 1 3/8"high × 3/4" to the web if I drill vertically through the flange with a 5/16"×3" Lag Bolt that came with the racks? From what i know the top part of the I-joist is compressed while the bottom is under tension and I can't seem to find any answers on the internet, except when it comes to drill through the web. It's also a 2 story home.

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  • I presume this is a wood I-Joist? Who made it, for that matter? Aug 3, 2022 at 2:24
  • Correct its wood. Not sure. On it is written Trus Joist
    – Elvis
    Aug 3, 2022 at 2:33
  • Knowing how an I joist is made, I’m pretty sure the answer is no. But reach out to some manufacturers and ask them. Aug 3, 2022 at 3:02
  • Wouldn't he want to contact the manufacturer of the I-joist instead of "some manufacturers?"
    – RetiredATC
    Aug 3, 2022 at 3:06
  • @RetiredATC I've added a picture to my post above
    – Elvis
    Aug 3, 2022 at 3:10

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In this publication from TJI it tells you where you can drill and cut the I-joist web. In bold letters it days DO NOT cut flanges.

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  • Informative, but the OP is asking about hanging a load from the flange. Aug 3, 2022 at 3:00
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    I believe he is asking if he can drill through the flange, although maybe I misread it.
    – RetiredATC
    Aug 3, 2022 at 3:03
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    Agree, but drilling into the flange and loading it is different from cutting the flange. Aug 3, 2022 at 3:04
  • @Aloysius Defenestrate You may be correct. The technical publication has holes in various places of various shapes and groupings in the web of the I-joist. There are no holes in the flanges. An additional note says to not cut or notch the flanges. Based on that, I would not drill a hole in the flange without consulting TJI first. Maybe I'm being too cautious, but the manufacturer is still in business and can be contacted for technical support. What's the downside?
    – RetiredATC
    Aug 3, 2022 at 17:23

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