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Cutting Hole in Double 2 x 10

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I need to cut a 6" hole through back to back 2" x 10"s. What do you guys recommend to do this with? Are those RotoZip tools any good?
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What are the 2x10's supporting?
That is 6" out of 9.25"
If this is a header & support - I don't think you can

I think:
You can drill holes in joist no closer than 2 1/2 from the outside edge of the joist, but, the hole cannot be any larger than 1/3 the floor joist...3 1/3 inches
WOW, just saw the other thread :eek:
Who built that like that?
And why start another thread leaving out all the important info?
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