Can you drill holes vertically through double joists

Reply

  #1  
Old 11-03-12, 08:34 AM
Member
Thread Starter
Join Date: Nov 2012
Location: USA
Posts: 3
Can you drill holes vertically through double joists

In my house there are 4 holes drilled vertical through double joists that span the length of the house in the middle, then the other joists go perpendicular across each side of the main joist. Obviously this double joist is the main one supporting the load down the middle of the basement. The house is 20 years old, it looks like they drilled four holes vertical through the double joists to run wire. Is this normal or to code? Has anyone seen this done?

Name:  joists.jpg
Views: 6987
Size:  24.0 KB
 
Sponsored Links
  #2  
Old 11-03-12, 08:36 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,349
I have seen it done, but some inspectors will not allow this without seeing an engineers approval.
 
  #3  
Old 11-03-12, 09:59 PM
Member
Join Date: Oct 2012
Location: USA
Posts: 11
I just did this on a garage conversion project. I didn't know of any other way to do it. What are some alternative methods for this kind of situation (how are you supposed to do it.)
 
  #4  
Old 11-04-12, 06:37 AM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: USA
Posts: 9,212
The joist in the picture is nothing more than a typical header made up of two 2 Xs with 1/2" spacers, usually 1/2" plywood, in between them to make up the 3 1/2" stud width. Generally the 2 Xs don't have a full piece of 1/2" plywood between them, but smaller pieces spaced throughout to keep the 2 Xs with a uniform 1/2" space between them and this seems to be the case here as you can see in the picture there is a 1/2" gap between them. My guess is that the two NM B cales are really in the 1/2" space, but someone also ran a drill through there to open the space a little to get the cables through a bit easier. I wouldn't worry about it.
 
  #5  
Old 11-04-12, 11:54 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,349
CJ, they looked like LVLs to me, that is why I cautioned about the drilling.
 
  #6  
Old 11-04-12, 01:50 PM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: USA
Posts: 9,212
They could be and I for a while thought so too, but I do see a definite and distinctive gap between what I now think must be 2 Xs.
 
  #7  
Old 11-05-12, 03:28 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,968
Jim and CJ, I don't think it is LVL, but Yellow Pine. There would be no need for spacing on LVL since it is 1 3/4" thick to compensate for the plywood needed normally.
 
  #8  
Old 11-05-12, 07:29 PM
Member
Thread Starter
Join Date: Nov 2012
Location: USA
Posts: 3
I took another close up picture, it looks like a very small gap between the two, but they drilled 1/2" hole I think.

Name:  basement2.jpg
Views: 2884
Size:  25.2 KB
 
  #9  
Old 11-05-12, 07:43 PM
Member
Thread Starter
Join Date: Nov 2012
Location: USA
Posts: 3
Maybe that gap is just the wood splitting a little bit because of the hole they drilled, the house is 20+ years old... That kind of worries me, I don't think I will drill any holes like they did.
 
  #10  
Old 11-06-12, 02:30 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 39,968
It's LVL. My eyes aren't as good as they used to be.
 
  #11  
Old 11-06-12, 05:06 PM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: USA
Posts: 9,212
You're right, Chandler. I never would have thought that after studying the first picture.
 
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
Display Modes
'