Fireblocking Question... - Building & Construction - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 04-05-2013, 07:08 PM   #1
Member
 
Join Date: Aug 2011
Location: Salt Lake City, Utah
Posts: 97
Rewards Points: 75
Default

Fireblocking question...


I am working on fireblocking my basement. I think I'm pretty much there.

I have blocked all the outside walls that were built slightly away from the foundation. I have blocked the walls horizontally every 10 ft or less as well.

In one room I have a 10"x10" soffit that runs all the way round the room.

I blocked below the soffit at the top of the stud bays to protect the soffit.

My question: Do I need to fireblock every 10 ft within the soffit itself? It wraps around the room, it is about 60 ft long total. A fire is slowed from getting into it by the blocking in the stud bays, but a fire in the soffit could travel all the way around the soffit.

From everything I have read, I don't need to fireblock within the soffit. I can't find anything in the code or other posts indicating I need to. But I thought I'd post the question anyway, in case I'm missing something.

Soffit has some HVAC in places, some plumbing, conduit for low voltage wiring, and some other low voltage wiring in it.

I have inspection in a couple weeks for my HVAC/framing/rough electric/rough plumbing.

Thanks in advance!

Advertisement

danielrg is offline   Reply With Quote
Old 04-05-2013, 07:58 PM   #2
Roofmaster
 
Join Date: Oct 2012
Location: Maryland
Posts: 3,669
Rewards Points: 2,096
Default

Fireblocking question...


What good does fire blocking do in a wall that has an air space cavity behind it, and who told you that you needed it?

Advertisement

__________________
" A lot of men build things, and a lot of things fall down "

jagans is offline   Reply With Quote
Old 04-06-2013, 07:09 AM   #3
Not so new
 
12penny's Avatar
 
Join Date: Nov 2008
Location: Lehigh Valley, Pa.
Posts: 934
Rewards Points: 504
Default

Fireblocking question...


Quote:
Originally Posted by jagans View Post
What good does fire blocking do in a wall that has an air space cavity behind it, and who told you that you needed it?

Its code in most places. The blocking goes to the concrete/block wall to keep fire from traveling up into the joist bays.
12penny is offline   Reply With Quote
Old 04-06-2013, 08:36 AM   #4
AHH, SPANS!!!
 
Join Date: Apr 2012
Location: Durham NC
Posts: 1,684
Rewards Points: 1,032
Default

Fireblocking question...


Quote:
Originally Posted by danielrg View Post
I am working on fireblocking my basement. I think I'm pretty much there.

I have blocked all the outside walls that were built slightly away from the foundation. I have blocked the walls horizontally every 10 ft or less as well.

In one room I have a 10"x10" soffit that runs all the way round the room.

I blocked below the soffit at the top of the stud bays to protect the soffit.

My question: Do I need to fireblock every 10 ft within the soffit itself? It wraps around the room, it is about 60 ft long total. A fire is slowed from getting into it by the blocking in the stud bays, but a fire in the soffit could travel all the way around the soffit.

From everything I have read, I don't need to fireblock within the soffit. I can't find anything in the code or other posts indicating I need to. But I thought I'd post the question anyway, in case I'm missing something.

Soffit has some HVAC in places, some plumbing, conduit for low voltage wiring, and some other low voltage wiring in it.

I have inspection in a couple weeks for my HVAC/framing/rough electric/rough plumbing.

Thanks in advance!
usually the soffit is considered part of the floor joist cavity (same air space) and as long as you have the wall blocked at the level of where the soffit meets the wall you are good to go, it keeps the wall air flow from pulling up into the soffit and then into the entire floor system above soffit. your next obvious concern would be where the exterior wall system is above the floor system and penetrations that allow the soffit and floor system air to get up into the wall.
hand drive is offline   Reply With Quote
The Following User Says Thank You to hand drive For This Useful Post:
danielrg (04-06-2013)
Old 04-06-2013, 12:55 PM   #5
Member
 
Join Date: Aug 2011
Location: Salt Lake City, Utah
Posts: 97
Rewards Points: 75
Default

Fireblocking question...


Thanks for your comments.

Any hidden cavities need to be fireblocked. It was in the handout from my city, and it is in the IRC as well.

I found this thread, which is very exhaustive, on our own site's pages:

http://www.diychatroom.com/f98/how-fireblock-framing-37190/


When I stated that the wall was built away from the foundation, I was saying it was built 1/2" to 1" away from the foundation due to the fact that the foundation wall is not very plumb or straight.

This case is covered in the above thread in posts 19-22:

How to fireblock framing

Interestingly enough, my question is addressed in posts 169 to 176 (intermixed). If I can trust "Termite" (and Hand Drive just above also) then he's saying I don't need to bother blocking the soffits horizontally. Link here:

How to fireblock framing

Since I've now heard it from two places, I'll consider all is well leaving the soffits open horizontally.

As for penetrations into the external walls above, I realized that I need to fireblock them at this point, but already I had filled them with expanding insulating foam since I was at the same time insulating the rim joists. It isn't fireblock rated, but I don't want to pull it out either, so I think I'll just leave it. The penetrations are all small anyway.

Last edited by danielrg; 04-06-2013 at 12:59 PM.
danielrg is offline   Reply With Quote
Reply


Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Another Aluminum Siding prep question aribert Painting 6 03-14-2013 02:48 PM
Plumbing for new shower kit question noviceshock Plumbing 6 03-02-2013 09:11 PM
3 Phase meter socket question a320200 Electrical 4 12-11-2009 01:45 AM
Fireblocking ? BrianAg95 Building & Construction 7 10-06-2009 09:56 PM
Basement Renovation Question KUIPORNG Remodeling 234 08-26-2008 09:19 AM




Top of Page | View New Posts