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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-30-2011, 08:11 PM   #1
Newbie
 
Join Date: Dec 2010
Posts: 25
Rewards Points: 10
Default

Fireblocking question w/ pics


I've read through the entire "How to Fireblock" thread but am still kind of unsure if anything more needs to be done for these scenarios.

1) The waste pipe is about 4" off the wall. We will be attaching 2x2s to the top plate extending out from the wall about 6" and then up to the ceiling attached to a 2x4 running perpendicular to the trusses, thus creating the soffit. Besides blocking it off where it will intersect with the connecting walls, I don't see where else it would need to be blocked. Is this all that needs to be done with this area?





2) Where my walls a parallel to the studs, there is only at most a 1/2" gap between the top plate and the xps. I assume this gap just needs to be filled with caulk or foam and thats all for these walls.



3) Where walls are perpendicular, I assume the same is true. As long the small 1/2" gap is filled, there is no way anything can escape from each cavity.



It seems simple enough but the more I read on fireblocking, the more my mind tries to over complicate it.

NEW-B is offline   Reply With Quote
Old 03-31-2011, 01:05 AM   #2
Registered User
 
Join Date: Mar 2009
Posts: 9,967
Rewards Points: 2,000
Default

Fireblocking question w/ pics


You need to stop a fire inside the wall from reaching the floor spaces above (cavities). 3/4" plywood or solid wood from the foam out to the soffit vertical sidewall, nailed to the bottom of the floor trusses. Also need it every 10' horizontally, from floor to ceiling (vertically); http://www.codecheck.com/cc/images/CC5thEdSample.pdf
Check locally with B.D. if they accept foam board continuous on concrete. I've had to cap running wall top plates with plywood that are parallel to truss above.

Gary

__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 03-31-2011, 09:36 AM   #3
Newbie
 
Join Date: Dec 2010
Posts: 25
Rewards Points: 10
Default

Fireblocking question w/ pics


Quote:
Originally Posted by GBR in WA View Post
You need to stop a fire inside the wall from reaching the floor spaces above (cavities). 3/4" plywood or solid wood from the foam out to the soffit vertical sidewall, nailed to the bottom of the floor trusses. Also need it every 10' horizontally, from floor to ceiling (vertically); http://www.codecheck.com/cc/images/CC5thEdSample.pdf
Check locally with B.D. if they accept foam board continuous on concrete. I've had to cap running wall top plates with plywood that are parallel to truss above.

Gary
So basically i'll have to cut notches out for those pipe hangers and either foam the gaps or put some more plywood perpedicular to cover them.

We use the 2006 International Building Code, however, I'm not getting inspections or pulling a permit. My assumption was that all the XPS should be covered with either drywall or plywood, even the XPS between the top plate and the sill. Would it be in my best interest to just remove any XPS that goes beyond the top plate and then just caulk or foam the gap between the concrete wall and top plate, thereby encapsulating the XPS?
NEW-B is offline   Reply With Quote
Old 03-31-2011, 11:48 AM   #4
General Contractor
 
Join Date: Feb 2010
Location: Portland, OR
Posts: 85
Rewards Points: 75
Default

Fireblocking question w/ pics


NEW-B,

I use a fair bit of Rock Wool / Mineral Wool to fire block voids in basement walls and joist bays.

5/8" drywall can also be used, and wall board guys are very, very good at notching around things (although I know I do need to pay close attention to their work in that sort of situation).

Looks nice,

Rory
__________________
Rory
RDG Read Development LLC
Portland, OR

Last edited by Rory Read; 03-31-2011 at 11:50 AM. Reason: typo
Rory Read is offline   Reply With Quote
Old 03-31-2011, 04:50 PM   #5
Newbie
 
Join Date: Dec 2010
Posts: 25
Rewards Points: 10
Default

Fireblocking question w/ pics


After doing more research, I do not believe the soffit needs to be blocked from above. The stud wall stops below that pipe and will be blocked all along that wall. So nothing in the stud cavities can travel into the soffit. That pipe is essentially part of the ceiling above. Does that make sense?

EDIT: this pic helps illustrate what I'm trying to say


Last edited by NEW-B; 03-31-2011 at 05:01 PM.
NEW-B is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
A question about water preassure. reasonforseason Plumbing 5 04-14-2009 05:36 PM
Intersecting "W" valley at different angles question HanksLBZ Roofing/Siding 3 10-07-2008 10:22 AM
Basement Renovation Question KUIPORNG Remodeling 234 08-26-2008 09:19 AM
First project, first question! lootcorp Remodeling 7 08-11-2008 10:06 PM
hrv question indep HVAC 3 07-17-2008 11:39 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.