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Old 02-02-2009, 05:48 PM   #46
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How to fireblock framing


Here's one that every house has. The hole around a tub trap must be fireblocked since there can be a considerable amount of concealed space under a tub/tub deck, and that space is usually wide open to the adjoining walls' studs. These are typically packed with fiberglass.

Yeah, I noticed the cut joist too.
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Old 02-02-2009, 05:49 PM   #47
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How to fireblock framing


Everybody has to fireblock their holes in plates. Not just sparky. The cable guy, home audio, etc.
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Old 02-02-2009, 05:53 PM   #48
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How to fireblock framing


Remember I mentioned dead spaces behind walls or between walls, and how they've got to be vertically firestopped every 10'? Here's a PERFECT example of how that is done. See how they notched the 3/4" plywood to fit up between the top plates? You don't get work any cleaner than this.
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Old 02-02-2009, 05:55 PM   #49
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How to fireblock framing


Here's a dead space that they framed unconventionally to take care of the fireblocking. Instead of using 2x top plates they used 3/4" plywood as one big top plate for all the little walls. That took care of the fireblock with no extra effort, and it was probably really easy to frame.
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Old 02-02-2009, 05:58 PM   #50
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How to fireblock framing


Here's a basement furdown that hasn't been fireblocked yet. See how the studs are wide open to the furdown? The plumbing will really make this a challenge. Usually I'll have people make a best effort to fill the bulk of the gap with wood and have them use packed insulation in the remaining spaces. Sometimes a metal strap helps bridge the gaps to give you something to pack the insulation against. On the right stud space I'd have them put a horizontal 2x4 block under the horizontal pipe. The left side block might be able to be notched out for the pipe and foamed tight.
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Old 02-02-2009, 06:01 PM   #51
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How to fireblock framing


And now, some properly firesblocked furdowns...
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Old 02-02-2009, 06:02 PM   #52
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How to fireblock framing


Here's a great way to build furdowns using 3/4" plywood against the studs. Cut it the height of the furdown, nail to the studs, and frame right to it. Viola! Fireblocked.
This framer held it just above his 2x4 furdown ceiling joists, and did a 2x4 band at the bottom of the plywood.
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Old 02-02-2009, 06:06 PM   #53
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How to fireblock framing


Here's a manufactured fireplace and direct vent chimney. It hasn't been fireblocked yet. A fire could move up and then horizontally into the joists directly above. The 2nd floor decking and the adjacent joists can serve as firestops, so this is easily taken care of.
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Old 02-02-2009, 06:11 PM   #54
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How to fireblock framing


Using some 2x's or 3/4" ply, here's where to put the fireblocks...
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Old 02-02-2009, 06:17 PM   #55
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How to fireblock framing


Here's a gable end wall that intersects with the roof/ceiling vault. It hasn't been fireblocked yet. The studs and the rafter space are open to each other.
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Old 02-02-2009, 06:19 PM   #56
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How to fireblock framing


A lot of people ask if they have to fireblock holes drilled through the studs for horizontal runs of wires and pipes.

The answer is generally no, except the wall must be sealed off into 10' sections. So, every 10' the studs should be sealed up. Personally, I'd take the time to seal them all, but that isn't required.
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Old 02-02-2009, 06:22 PM   #57
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How to fireblock framing


Last but not least, the code requires that walls taller than 10' be fireblocked so the spaces between the studs don't exceed 10' in height. This also applies to dead spaces and chases, and spaces behind furred out walls. So if your wall is 14' high, you need a block at the 10' height, or somewhere between 4' and 10' off the floor.
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Old 02-02-2009, 06:25 PM   #58
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How to fireblock framing


Ok, I'm out of scenarios, and you're probably tired of reading them. We've pretty much covered everything I can think of that you'd encounter on the average addition, remodel, or basement finish.

If anyone has questions don't hesitate to post them. Even better, post pictures with your questions to illustrate what you need to fireblock or demonstrating how you fireblocked it. Just be ready for my critique!
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Old 02-02-2009, 07:18 PM   #59
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How to fireblock framing


Quote:
I've been working on sealing my attic since November and, depending on how you answer my question, I think it's completely sealed. In post #6, where the vent goes up through the attic floor, I had a heck of a time in my attic figuring out what to use to seal the 1" gap between the vent and the wood flooring because that vent gets pretty hot. First I used Great Stuff, then found out it can't be used on surfaces over 140 degrees F. I took all of that out and replaced it with the Great Stuff Fire Blocker foam. That can't be used on surfaces over 140 F either. I cut all of that out and I'm glad I did. The foam that was in contact with the vent was melted. I'll take a picture of a piece of it and post it.
Here are a couple pieces of the foam removed from around that hot vent. You can see the rounded, darker orange area that was in contact with the pipe. The lighter shade of orange is what it's suppose to look like.

How to fireblock framing-dsc04503.jpg-re-sized.jpg

Quote:
I can tell you for sure that the fire foam doesn't do very well against a propane torch!
I'm going to start a fire in the firepit this weekend and hold the foam over it to see how it burns. I'll burn the regular Great Stuff and the Fire Blocker. Up-wind from it, of course.

Last edited by gma2rjc; 11-29-2009 at 11:47 PM. Reason: add picture
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Old 02-02-2009, 08:19 PM   #60
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How to fireblock framing


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Originally Posted by gma2rjc View Post
I'm going to start a fire in the firepit this weekend and hold the foam over it to see how it burns. I'll burn the regular Great Stuff and the Fire Blocker.
I'm all about setting stuff on fire in the fire pit. If you can, post some pics of the before and after condition of each. Don't burn yourself.

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