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walkereng, Consultant
Category: Structural Engineering
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Experience:  Over 30 years of Structural Engineering experience.
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I need to drill a wiring hole up through the middle of a 3

Customer Question

I need to drill a wiring hole up through the middle of a 3 ply, 1 3/4 inch ( 5 1/4 total ) 18 inch deep beam ( 20 foot span ) to mount a ceiling fan. Is this possible ? If so how large a hole can be drilled ? Drilling in this direction ( up through the depth of the beam) does not appear to be covered in the specs or drilling guide.
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  Rick replied 1 year ago.

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The reason you don't see any specs for this type of drilling is because you can't do it. A hole in that direction will decrease the load bearing capacity of the beam.