Can I legally drill a hole of 4" diameter in concrete load bearing beam above window through core cutting method?

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    Probably not. That's likely a third of the beam's height or more. That said, it's a question for a local engineer. – isherwood Nov 24 '17 at 11:48

No. You shouldn't drill any hole in a structural member without a structural engineer's or manufacturer's (who probably has an engineer on staff) approval, and they will tell you where you can locate it.

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