Cutting Hole for Vent in 2nd floor rim joist?

Reply

  #1  
Old 01-07-14, 01:28 PM
B
Member
Thread Starter
Join Date: Nov 2010
Location: USA
Posts: 352
Received 0 Votes on 0 Posts
Cutting Hole for Vent in 2nd floor rim joist?

We are building a house and we are looking to vent the range vent hood outside. What I am wondering, is if we can vent the hood out where I have circled in red in the image. It requires a 6" hole to be cut to the outside (rim joist is a 2x12). The wall is on the non-gabled end of the house. And in case it isn't obvious, this is the first floor and the duct would run in the joist space on the right hand side of the picture. There is a 2nd floor above this as well (which is probably obvious) Is this doable or do we need to consider another solution.
 
Attached Images  
  #2  
Old 01-07-14, 04:39 PM
P
Temporarily Suspended
Join Date: Jul 2008
Location: NY
Posts: 10,982
Received 0 Votes on 0 Posts
What's the largest hole which can be SAFELY cut through a 9 1/2" x 1 1/2" header joist?

As mentioned in the above site, dryer vents are cut through the rim joists all the time & 6" should be okay in a 2x12. Other answers mentioned other issues.
 
  #3  
Old 01-07-14, 05:49 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 26,586
Received 791 Votes on 728 Posts
I agree w/Pulpo...

Drill your hole along the neutral axis of the rim joist (in the center) and it will be fine. Your rim joists are sitting on a top plate and are not only solidly supported underneath but are also covered with structural sheathing so there is no concern about drilling a 6" hole in them.
 
  #4  
Old 01-07-14, 06:17 PM
B
Member
Thread Starter
Join Date: Nov 2010
Location: USA
Posts: 352
Received 0 Votes on 0 Posts
Originally Posted by XSleeper View Post
I agree w/Pulpo...

Drill your hole along the neutral axis of the rim joist (in the center) and it will be fine. Your rim joists are sitting on a top plate and are not only solidly supported underneath but are also covered with structural sheathing so there is no concern about drilling a 6" hole in them.
Thanks again Xsleeper :-)
 
  #5  
Old 01-07-14, 07:21 PM
B
Member
Thread Starter
Join Date: Nov 2010
Location: USA
Posts: 352
Received 0 Votes on 0 Posts
Can anyone point to the specific building code that permits holes in the rim joist? I can't seem to find one in any code anywhere.
 
  #6  
Old 01-07-14, 09:39 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 26,586
Received 791 Votes on 728 Posts
The code is a list of restrictions, not a list of what is permitted. It's not in the code because there are no restrictions, within reason. The restrictions cover top plates, floor joists, headers, girders, rafters, things that are structural and span a distance unsupported. A rim joist does not span anything.

The only way you could get into trouble is if your hole is HUGE and a framing member (a king stud and trimmer that is holding up a large header for example) falls directly over a GIANT hole in the rim joist. So maybe just take a peek upstairs and make sure your hole isn't going to be directly below the edge of a door or window since the header weight would be right there.
 
  #7  
Old 01-08-14, 04:14 AM
B
Member
Thread Starter
Join Date: Nov 2010
Location: USA
Posts: 352
Received 0 Votes on 0 Posts
Originally Posted by XSleeper View Post
The code is a list of restrictions, not a list of what is permitted. It's not in the code because there are no restrictions, within reason. The restrictions cover top plates, floor joists, headers, girders, rafters, things that are structural and span a distance unsupported. A rim joist does not span anything.

The only way you could get into trouble is if your hole is HUGE and a framing member (a king stud and trimmer that is holding up a large header for example) falls directly over a GIANT hole in the rim joist. So maybe just take a peek upstairs and make sure your hole isn't going to be directly below the edge of a door or window since the header weight would be right there.
That's great news. There isn't anything above this rim joist so we might be in the clear. Thanks!
 
 

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