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Old 10-21-2008, 10:31 AM   #1
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Engineered OSB I-Beam floor joists


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.

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Old 10-21-2008, 11:06 AM   #2
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Engineered OSB I-Beam floor joists


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.

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Old 10-21-2008, 12:11 PM   #3
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Engineered OSB I-Beam floor joists


If you look at the side of the joist you might see templates for holes and some are already notched out.
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Old 10-21-2008, 02:28 PM   #4
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Engineered OSB I-Beam floor joists


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Originally Posted by Marvin Gardens View Post
If you look at the side of the joist you might see templates for holes and some are already notched out.
Yes, and with a good hammer, they can be punched out. It may be easier to punch out after predrilling holes along the circumference first though.
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Old 10-21-2008, 03:22 PM   #5
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Yes, and with a good hammer, they can be punched out. It may be easier to punch out after predrilling holes along the circumference first though.
Be cautioned that a hammer should only be used to remove the circular stamped knockouts that are in the joist's web. Using a hammer to create a larger hole is not an acceptable practice. A drill bit or hole saw is in order, depending on the size of the hole.
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Old 10-22-2008, 11:08 AM   #6
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Engineered OSB I-Beam floor joists


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Be cautioned that a hammer should only be used to remove the circular stamped knockouts that are in the joist's web. Using a hammer to create a larger hole is not an acceptable practice. A drill bit or hole saw is in order, depending on the size of the hole.
I didn't recommend creating a larger hole.

From my experience, knocking out those holes using a hammer is not easy, and very noisy.

That's why I recommended drilling small holes along the circumference of the perforated hole line
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Old 10-22-2008, 11:11 AM   #7
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I didn't recommend creating a larger hole.
I didn't say you did. Hammer holes are common unfortunately. It bears mentioning.
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Old 10-22-2008, 01:40 PM   #8
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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.
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Old 10-22-2008, 03:15 PM   #9
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Engineered OSB I-Beam floor joists


In fact, instead of using the hammer, I'd recommend using a hole saw for those perforated holes.

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