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!
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.
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:
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:
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:
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.
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