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Old 02-22-2014, 08:30 PM   #1
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2x4 or drywall for fireblock?


I'm a diy'er finishing my basement and I just failed my framing inspection due to fireblocking or lack thereof. I'm debating how to handle the furred out foundation walls. I bought some drywall, but I'm concerned about the time and effort required to cut them to size to fit in between the studs. It seems I could also cut 2x4's and but them against the foundation wall. If I do so, would I need to use pt lumber since it will reside against the concrete. What approach is recommended, drywall, 2x4, 2x4 pt, or something else I'm not thinking of?

The gap between the wall probably varies from 1/8" in tight spots and 1" in the big gaps. (The foundation wall was being pushed in and is far from straight now)

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Old 02-23-2014, 03:34 AM   #2
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2x4 or drywall for fireblock?


It'd be best to ask the building department what they mean by fire blocking.

It may or may not have anything to do with the gap between the masonry wall and framing. It may be something as simple as filling in the gap around any pipes or wires that are passing through the sole and/or top plates.

Maybe they (building department) also require additional boards to be installed horizontally between the studs - which means you just need to cut a bunch of 14 1/2" lengths of 2X4 and nail them in.

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Old 02-23-2014, 06:50 AM   #3
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2x4 or drywall for fireblock?


Fire blocking is usually wood----drywall is sometimes required inside soffits

could you post a picture of the areas that were flagged by the inspector?
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Old 02-23-2014, 07:58 AM   #4
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2x4 or drywall for fireblock?


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Originally Posted by oh'mike View Post
Fire blocking is usually wood----drywall is sometimes required inside soffits

could you post a picture of the areas that were flagged by the inspector?
Sure. Here a couple of examples. Now, I'm wondering if I do add horizontal blocking in between the studs. what about the cavity behind the studs? I'm still thinking vertical and not horizontal, would that be a pathway up into the floor joists?

2x4 or drywall for fireblock?-resize.dsc03640.jpg

2x4 or drywall for fireblock?-resize.dsc03643.jpg
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Old 02-23-2014, 10:46 AM   #5
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2x4 or drywall for fireblock?


It looks like the holes that the wiring runs through need to be sealed with fire caulk.

now just a simple question.
which burns quicker, a 2x4 or sheetrock?
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Old 02-23-2014, 12:28 PM   #6
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2x4 or drywall for fireblock?


Check with inspector on putting roxul insulation in that gap.between top plate and foundation You can get it at homedepot or lowes. It is like fiberglass insulation except it is alot denser and doesnt burn. By far the easiest way to do it.
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Old 02-23-2014, 02:53 PM   #7
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2x4 or drywall for fireblock?


I prefer wood.
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Old 02-23-2014, 04:10 PM   #8
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2x4 or drywall for fireblock?


I'm going to wait until I talk to the inspector tomorrow before doing anything. I did pick up some Roxul Safe 'n Sound. Is this typically whats used? I couldn't find anything else at my local big box store. I'll ask the inspector before using it, but I was just curious if this was the right product or not.
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Old 02-23-2014, 07:59 PM   #9
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2x4 or drywall for fireblock?


I don't think so. But then again I'm not familiar with how your county reads and applies the building codes. As you are planning, wait and ask the inspector.

For the holes which you routed wiring, use a caulking. Something like this
http://www.homedepot.ca/product/3m-f...sealant/924725).
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Old 02-23-2014, 08:28 PM   #10
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2x4 or drywall for fireblock?


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I don't think so. But then again I'm not familiar with how your county reads and applies the building codes. As you are planning, wait and ask the inspector.

For the holes which you routed wiring, use a caulking. Something like this
http://www.homedepot.ca/product/3m-f...sealant/924725).
I'm with you there. I was planning on using a product like that for the cable holes. I was thinking about using the roxul product for the void between the framed wall top plate and the foundation wall.
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Old 02-23-2014, 11:21 PM   #11
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2x4 or drywall for fireblock?


Quote:
Originally Posted by mklein49 View Post
I'm going to wait until I talk to the inspector tomorrow before doing anything. I did pick up some Roxul Safe 'n Sound. Is this typically whats used? I couldn't find anything else at my local big box store. I'll ask the inspector before using it, but I was just curious if this was the right product or not.
Safe 'n' Sound will work for fireblocking purposes (if permitted by AHJ), just keep in mind that it's not designed for thermal insulating purposes. For that you would use ComfortBatt, which is thicker, has R values of 15+ and is cheaper than Safe 'n' Sound.

Personally, I would buy the ComfortBatt... Less expensive, takes care of fireblocking, adds R value. Win. Win. Win.
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Old 02-24-2014, 09:33 AM   #12
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2x4 or drywall for fireblock?


2x4's treated cut between the studs and pushed back tight to the concrete and nailed into plate. then fire foam or rock wool between the 1 1/2" gaps left at each stud filling back to the concrete. you also need fire blocking at all soffits where they land on the wall...
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Old 02-24-2014, 08:38 PM   #13
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2x4 or drywall for fireblock?


MO is under the IBC; http://www.reedconstructiondata.com/...uri/st.-louis/

http://publicecodes.cyberregs.com/ic...9_7_sec017.htm

AND: http://publicecodes.cyberregs.com/ic..._23_par140.htm

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Old 02-26-2014, 01:03 PM   #14
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2x4 or drywall for fireblock?


Just pass my inspection...I ended up with using a bit of everything. I nailed p.t. 2x4's in the gaps between the studs tight against the foundation wall. Stuffed Roxul Safe n' Sound insulation in the larger open areas and behind the void of the vertical studs. Finally, I hit the wire holes and some small seams with Great Stuff Fireblock.

Oh I had to frame up a simple platform for holding up the Roxul.

Thanks for all the recommendations!
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2x4 or drywall for fireblock?-resize.dsc03792.jpg   2x4 or drywall for fireblock?-resize.dsc03801.jpg  
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Old 02-26-2014, 01:30 PM   #15
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2x4 or drywall for fireblock?


Thats good. Now you get to insulate. Then wait for another inspection.

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