Rules for drilling through double joist

Reply

  #1  
Old 01-13-15, 07:12 AM
B
Member
Thread Starter
Join Date: Jan 2015
Posts: 4
Received 0 Votes on 0 Posts
Rules for drilling through double joist

I want to run power to a light at the bottom of my basement stairs. To get there, I need to drill through a double joist which is likely part of a load-bearing wall. Am I allowed to do this or should I figure out how to route my wire around the long way to avoid drilling? Thanks.
 
Sponsored Links
  #2  
Old 01-13-15, 07:25 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 56,388
Received 747 Votes on 702 Posts
Welcome to the forums.

One 3/4" hole for one wire would be be no problem.
 
  #3  
Old 01-13-15, 07:31 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,082
Received 63 Votes on 55 Posts
Are you planning on a vertical or horizontal hole?
 
  #4  
Old 01-13-15, 07:37 AM
I
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,944
Received 42 Votes on 40 Posts
Some joist & stud drilling guidelines:

 
  #5  
Old 01-13-15, 09:30 AM
B
Member
Thread Starter
Join Date: Jan 2015
Posts: 4
Received 0 Votes on 0 Posts
1 horizontal hole on the outer 1/3 will do it! Thanks for the welcome and the info!
 
  #6  
Old 01-13-15, 10:36 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,082
Received 63 Votes on 55 Posts
You do not want the holes in the outer portions.
 
  #7  
Old 01-13-15, 11:59 AM
B
Member
Thread Starter
Join Date: Jan 2015
Posts: 4
Received 0 Votes on 0 Posts
In the graphic that ibpooks showed, it looks like it doesn't matter, except for notches which is not what it am doing. Is that not the case?
 
  #8  
Old 01-13-15, 03:29 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 13,300
Received 133 Votes on 117 Posts
It is more of an issue for a plumber drilling out a 4" hole. Electricians mostly make smaller holes.
 
  #9  
Old 01-13-15, 04:39 PM
Handyone's Avatar
Member
Join Date: Aug 2000
Location: U.S.
Posts: 5,451
Received 0 Votes on 0 Posts
The graphic above shows the outside edge of hole at least 2" away from bottom or top or joist.
This is not only for integrity of joist (especially small electrical holes), it is to place cable in a position where getting hit with a screw or nail is unlikely.

Notching requires nail stop plates.
 
  #10  
Old 01-13-15, 06:06 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,082
Received 63 Votes on 55 Posts
A hole centered top to bottom weakens less than one closer to the edges.
 
  #11  
Old 01-13-15, 06:08 PM
B
Member
Thread Starter
Join Date: Jan 2015
Posts: 4
Received 0 Votes on 0 Posts
So my plan of a small hole, outer 1/3rd of the joist, would be fine as long as I am > 2" away from the top or bottom. Thanks!
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


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