Boring Hole in staircase 2x10s

Old 07-31-16, 11:19 PM
Thread Starter
Join Date: Mar 2013
Location: USA
Posts: 12
Received 0 Votes on 0 Posts
Boring Hole in staircase 2x10s

Hi All!

I've had great luck with advice on these forums, so i figured why quit now. My latest question is in regards to holes bored in joists. I'm not sure of the correct terminology, but this would be the double 2x10's in the basement, running perpendicular to the floor joists, that support the stringers for the stairs going from the 1st floor to the second floor. (Pictures below are worth 1000 words).

Quick description: The house is a 2 story colonial with 2 stair cases, directly above each other in the center of the house (one leading from the front door to 2nd story, and the other directly beneath leading from the 1st floor to the basement). The first floor landing support "beam" in question is directly over head of the last stair in the basement and run perpendicular with the floor joists.

Basically, what I need to do is run a 14-2 wire through those 2x10s, to add a light to the ceiling of that basement staircase. I'm not sure of how advisable it would be to bore a hole through those 2x10s, even a 5/8" or 3/4" for the one wire.

Thanks in advance.

Name:  basement1.jpg
Views: 289
Size:  27.9 KB

Name:  basement2.jpg
Views: 459
Size:  26.0 KB

Name:  basement3.jpg
Views: 354
Size:  23.5 KB

Last edited by ray2047; 07-31-16 at 11:30 PM. Reason: Put spacing between the pictures.
Old 07-31-16, 11:31 PM
ray2047's Avatar
Join Date: Mar 2006
Location: USA
Posts: 33,575
Received 15 Votes on 13 Posts
A " hole in the center won't be a problem.

Moved to Electrical forum.
Old 08-01-16, 04:20 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,964
Received 9 Votes on 8 Posts
Since you are in a semi-finished state, I don't see why you have to bore a hole from side to side. Is there no other route? As Ray said, however, there is no problem with a 3/4" hole.
Old 08-01-16, 05:11 AM
Join Date: Jan 2011
Location: USA
Posts: 5,007
Received 125 Votes on 110 Posts
If you did it that way how would you cover that header with sheetrock?
Old 08-01-16, 05:15 AM
Geochurchi's Avatar
Join Date: Nov 2012
Posts: 5,584
Received 154 Votes on 140 Posts
Hi, are the fixtures IC rated? they need to where there is insulation around them.
Old 08-01-16, 07:01 AM
Thread Starter
Join Date: Mar 2013
Location: USA
Posts: 12
Received 0 Votes on 0 Posts
Thanks for the quick replies! I was planning on shimming out the header with 2x4s laid flat against the header, to give a cavity for the wire, and also the ability to Sheetrock over it. I can't figure out another route, since the light is under the stairs going to the second floor, either side has stringers to contend with, so I can't get into the walls. Also, yes, all fixtures are IC rated, thank you.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: