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Discussion Starter · #1 ·
Im adding a sub panel and need to run a 1 1/4" conduit. I would like to put the conduit in the wall but wondering what is the maximum size hole that I can drill through the studs. It would probably need to be drilled 1 1/2" size and have to drill about 6 studs. I can run it surface if needed but would like to put it inside the wall.

Whats the max size I can drill through the studs?
 

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If it's not a bearing wall, I wouldn't be concerned. You still have an inch on each side left.


Think about steel studs. They have 1bout 1 1/2 inch holes punched in them every couple feet.


Technically, I don't know the answer. :jester:
 

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Discussion Starter · #3 ·
If it's not a bearing wall, I wouldn't be concerned. You still have an inch on each side left.


Think about steel studs. They have 1bout 1 1/2 inch holes punched in them every couple feet.


Technically, I don't know the answer. :jester:
Thats exactly what I was thinking also, "technically" I dont know the answer either:huh:
 

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40% allowed in bearing walls and 60% allowed in non-bearing walls.

For a 2x4 this is 1-7/16" or 2-1/8"

Either way you will need nail plates on BOTH sides of every stud.
 

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40% allowed in bearing walls and 60% allowed in non-bearing walls.

For a 2x4 this is 1-7/16" or 2-1/8"
I believe you, so don't take this question the wrong way. Could you provide a code citation? This is really good information, and I would like to be able to tell people this and back it up. Thanks, sincerely.
 

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I believe you, so don't take this question the wrong way. Could you provide a code citation? This is really good information, and I would like to be able to tell people this and back it up. Thanks, sincerely.
I have this Wood Boring Guide .pdf file. It is from:

Western Wood Products Association
522 SW Fifth Avenue Suite 400
Portland, OR 97204-2122
503/224-3930 Fax: 503/224-3934
e-mail: [email protected]
web site: http://www.wwpa.org

I don't remember where I got it but you can try it here: http://www2.wwpa.org/Portals/9/docs/PDF/A11.pdf

I had to join their site to see if it was still available. It is but you may have to join (for free).
 

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Did the .pdf link work for you?
 

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Speedy, the pdf works. Very good info. Thanks.
 

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- http://www.canyonco.org/dsd.aspx?id=8823

____________
Home Inspection: "A business with illogically high liability, slim profit margins and limited economies of scale. An incredibly diverse, multi-disciplined consulting service, delivered under difficult in-field circumstances, before a hostile audience in an impossibly short time frame, requiring the production of an extraordinarily detailed technical report, almost instantly, without benefit of research facilities or resources." - Alan Carson
 

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IRC R602.6
Same info. Perfect reference Michael. Thanks.
 

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- http://www.canyonco.org/dsd.aspx?id=8822

-------------------
Home Inspection: "A business with illogically high liability, slim profit margins and limited economies of scale. An incredibly diverse, multi-disciplined consulting service, delivered under difficult in-field circumstances, before a hostile audience in an impossibly short time frame, requiring the production of an extraordinarily detailed technical report, almost instantly, without benefit of research facilities or resources." - Alan Carson
 

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Im adding a sub panel and need to run a 1 1/4" conduit.....It would probably need to be drilled 1 1/2" size....
You will need a minimum 1-3/4" hole size to accommodate a 1¼" trade size conduit.

If you are installing PVC conduit, then a 2" hole is required for any couplings to pass through.
 
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