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Old 08-16-2010, 02:21 AM   #166
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How to fireblock framing


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Lurked Nov of last year but and actually started framing basement without permit. Now am worried about actually getting a permit. Actually I went to zoning office, obtained forms and requested for any zoning/coding materials and they say they don't distribute out any longer since not everything applies to a given property. Sounds kind of suspicious to me. Then how do I know if I'm actually doing the right thing or not. Is this what they mean by NJ corruption? Gentleman I spoke to actually suggested metal studs but I've already purchased 2x3 lumber. Anyway, do you think fireblocking I've done with 9/16 drywall on above top plate is sufficient so far or is this sloppy work? Live in Sayreville, NJ and this was a 2005 new construction with pre-installed foil batt insulation. New framing is offset from actual concrete wall(anywhere from 4-6" approx). Please note, of course, that in pictures wall is the one with foil backing. Let me know if I need to post individual pictures. Framing is 2x3" and 9/16 drywall as fireblock on above or beside top plate.
http://alegende.multiply.com/photos/album/6/basement

Here are the original pictures posted on diychatroom site
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Old 01-20-2011, 10:35 PM   #167
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How to fireblock framing


I am in the process of framing my basement. I have 2X4 walls that connect to a soffit. Here is the beginning of my fire blocking. Does this look correct? And, do I need to do anything with the soffits themselves where they meet the floor joists? I used 2X4 blocks between the studs to prevent flow up into the soffit and then tightly packed in insulation between those blocks and the foam insulation on the concrete walls to plug the gaps so there is no vertical to horizontal flow. I have also added a vertical board (along the third stud from the right) to prevent spread behind the wall. I will fill any remaining gaps there with fireblock foam. I appreciate this thread and the education it has provided! I want to get this right and feel comfortable with this before I cover it up with drywall. Thanks!!

Here is what I have so far. The soffit surrounds the entire room for a tray ceiling. The partition wall on the right side of the room (with respect to this picture) will only be drywalled on one side and unfinished on the other. The soffits will contain can lights and I plan on putting non faced fiberglass insulation in both the floor joist cavities above, the soffits and between the wall studs on the outside walls along the concrete. I wish I had put drywall up against the bottom of the floor joists before doing the soffits but I didn't. What else should I do, if anything, to make the fire blocking correct?

Last edited by barlav; 01-21-2011 at 07:44 AM.
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Old 01-21-2011, 03:26 PM   #168
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How to fireblock framing


Barlav it looks like a pretty good job. Two things I'd address:

1) The foam board will burn fast and hot, so I'd treat it like it isn't even there. Instead of fireblocking TO it, I'd fireblock PAST it. Packing fiberglass to the foam is good for preventing air movement to feed a fire, but in an involved fire it will not perform as intended because that foam board will dissapear in a heartbeat.

2) With #1 in mind, don't forget to address horizontal movement of air and fire between the foundation wall and the studs. The fire cannot have more than 10' of horizontal movement potention before hitting a fireblock.

I'm just not a fan of foam board being an integral part of a fireblock. I firmly believe that the foam needs to stop at the fireblocks so they are continuous to the foundation in this case.
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Old 01-21-2011, 04:01 PM   #169
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How to fireblock framing


Thanks so much for the feedback and additional ideas!

So, there is nothing that should be done with the soffits? I was wondering with them being open up to the joists above if it needed any blocking there or anyplace along the run of the soffits that surround the room? Or will the insulation that I put in them accomplish enough fire block for me?

I think I see what you mean about going past the foam. I imagine I could cut "slots" into the foam board and extend blocks right to the foundation and fill in the gaps with fire block foam or insulation?

I have addressed the horizontal movement with that additional vertical stud (shown 3 studs in from the right) and will fill in the gaps with packed insulation or fire block foam. But first I will make that vertical stud and replace it with one that will get all the way to the concrete.

Thanks again! This is an amazing resource!
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Old 01-21-2011, 11:38 PM   #170
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How to fireblock framing


No problem Barlav, glad its helping.

You do not have to isolate horizontal soffits/furdowns from the horizontal floor joist spaces. Fireblocking is intended to isolate vertical spaces from horizontal spaces, so as long as your vertical wall spaces are not open to the horizontal soffit or floor joists, you're good.

What you propose with removal of the foam at the fireblocks is a good idea from a fireblocking standpoint. That would be what I'd do, sealed up nice and tight with fireblocking foam from an insulating standpoint. I'd suggest contacting your inspector to make sure what you do will satisfy local requirements.
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Old 01-22-2011, 04:19 PM   #171
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How to fireblock framing


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No problem Barlav, glad its helping.

You do not have to isolate horizontal soffits/furdowns from the horizontal floor joist spaces. Fireblocking is intended to isolate vertical spaces from horizontal spaces, so as long as your vertical wall spaces are not open to the horizontal soffit or floor joists, you're good.

What you propose with removal of the foam at the fireblocks is a good idea from a fireblocking standpoint. That would be what I'd do, sealed up nice and tight with fireblocking foam from an insulating standpoint. I'd suggest contacting your inspector to make sure what you do will satisfy local requirements.
Great thanks! That's good to hear because I wasn't sure how I would even go about the soffits. Thanks again for this help and for the time you put in on this! It is much appreciated!
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Old 01-23-2011, 01:09 PM   #172
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How to fireblock framing


Thanks for the pictures. barlav, don't you have to do anything to block off the soffits at 10ft horizontal intervals?
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Old 01-24-2011, 02:43 PM   #173
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How to fireblock framing


has anyone taken a look at my pictures above ? wow, this was posted back in apr of last year and i've actually suspended work until i got permits; if it doesn't look secure, please let me know before i continue on and get this inspected. thanks in advance -legende
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Old 01-24-2011, 11:49 PM   #174
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How to fireblock framing


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has anyone taken a look at my pictures above ? wow, this was posted back in apr of last year and i've actually suspended work until i got permits; if it doesn't look secure, please let me know before i continue on and get this inspected. thanks in advance -legende
Legende I'm still having a very difficult time telling what I'm looking at from your pictures. The sheetrock is an acceptable fireblock but it must be done in a workmanlike manner. The cutout around the pipe would be a problem unless there is blocking at the seams. Plus everything must be fireblocked tight with fireblocking foam or other listed fireblocking sealant.
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Old 01-25-2011, 02:15 AM   #175
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How to fireblock framing


Absolutely GREAT. Thank you !!!!
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Old 01-25-2011, 04:54 AM   #176
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How to fireblock framing


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Thanks for the pictures. barlav, don't you have to do anything to block off the soffits at 10ft horizontal intervals?
I could do this easy enough but I'm not sure if it's required? I can see where it would benefit if the soffits ran perpendicular to the floor joists above. If the soffit runs parallel to the joists then I'm not sure what benefit it would serve if they aren't blocked off to the joists above?
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Old 01-25-2011, 10:33 AM   #177
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How to fireblock framing


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Legende I'm still having a very difficult time telling what I'm looking at from your pictures. The sheetrock is an acceptable fireblock but it must be done in a workmanlike manner. The cutout around the pipe would be a problem unless there is blocking at the seams. Plus everything must be fireblocked tight with fireblocking foam or other listed fireblocking sealant.
thekctermite, Sorry if pictures are consuing. Had pictures in previous postings of more a panoramic view of the close-up pictures above. I was thinking of just wedging some unfaced fiberglass insulation at seams between sheetrock and top plate , and around the pvc pipe, if I left it as is right now. But, anyway, I think I'm going to redo the sheetrock fireblock against the foundation, make it wider and nail the top plate against it - I think that should be fine right? Do I then need to get some 3M firecaulk and seal sheetrock against the foundation wall(sheetrock's opposite end from top plate). This is going to be difficult as is barely visible and there's no space to maneuver the caulk gun probably.
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Old 04-26-2011, 11:49 PM   #178
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How to fireblock framing


Awesome Thread.

I'm almost done framing my basement. And now I see I have more work to do. I'll try to get some before and after pics to make a small contribution to Termite's huge one.

And it's so releaving that ONE other person on this site doesn't use the foam board insulation method. I didn't choose not to. It was just too late before I found out about it, and I wasn't starting over. Now I have a really good reason. And it makes plenty of sense. Sorry. No disrespect to GBR and Homesealed. You guys both provide tons to the site. I'll be the first to commend you and post "the wrong way" if I run into a dissaster with my fiberglass batts.

So once I completely fireblock the entire top plate. Then seal the bottom plate with any other foam (even though I SHOULDN'T have to). Won't that prevent the convective(SP) loop?
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Old 04-27-2011, 09:50 AM   #179
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How to fireblock framing


OK, so I need to fireblock this gap between the wall and top plate. But not where it goes into the room at the end.

And then above the elecrtical panel.
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Old 04-27-2011, 09:54 AM   #180
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Then I have this big ole' mess. I need to fireblock anything that opens up into the soffit, correct? That's going to be tricky.
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