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Old 03-02-2011, 12:30 PM   #1
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floor joists


maximum hole size for electrical cable. Can holes be made with a drill and jig saw? Wood is too hard for hole saw. 100 yrs old.

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Old 03-02-2011, 06:02 PM   #2
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Originally Posted by Taters Grandpa View Post
maximum hole size for electrical cable. Can holes be made with a drill and jig saw? Wood is too hard for hole saw. 100 yrs old.
The size of the hole depends on the size of the beam. How big of a hole do you need for a wire? You can drill a 1" hole in the middle of a 2x6.
Most holes in wood, would be done with a drill. Forget the jigsaw.
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Old 03-02-2011, 09:23 PM   #3
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Wow, a centurion!

http://arch.umd.edu/Tech/Structural_..._Guide_A11.pdf

Gary
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Old 03-02-2011, 11:36 PM   #4
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How big is this cable? Hole in the middle of the floor joist closer to the centre of the span would be the best choice.
can you do it ith a 1" auger or less?
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Old 03-03-2011, 08:21 AM   #5
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I thought most codes stipulate no more than 1/3 of the size of the joist. That may be intended for other framing members.

I'm like the others, what size wire/cable?

If worried about the size of the hole, why not use insulated staples. Is the wood too hard for them? second story?

Ditto on forgetting the jigsaw.
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Old 03-03-2011, 02:17 PM   #6
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Forstner bit.

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