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Old 04-25-2012, 10:23 AM   #1
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Finishing Basement


First time post here...Couple of questions regarding my finished basement project:
1. The foundation walls currently have blanket insulation (diaper) on them. Is it ideal to frame 2 inches away from this or is it a better idea to remove this and put up polystyrene sheets and frame against that? Does having the blanket insulation there make it more difficult to fireblock than having a solid surface at the foundation wall?
2. The building code says that "Framed walls and deadspaces will be fireblocked at top and sealed to foundation wall" I understand the fireblocking portion of this but when they say "sealed to foundation wall" are they saying the fireblocking should create a seal against the foundation wall? I assume that's what it is but I want to be sure.

Thanks for your time.
-Ben

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Old 04-25-2012, 11:04 AM   #2
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for basement insulation:

http://www.buildingscience.com/docty...ion-assemblies

i'm finishing my basement right now and using method number 8.

for the fireblocking, idea is that a fire in the space between the stud wall and the foundation face cannot easily propagate. this also includes the horizontal direction (every 10'). so every 10' along the stud wall, you will need to have an acceptable fireblocking means that will extend from the stud wall to to the foundation.

check out this as well:

How to fireblock framing

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Old 04-25-2012, 11:07 AM   #3
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also, check out this link for problems with blanket insulation. i would tear it down if i were you.

http://www.buildingscience.com/docum...lation-systems
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Old 04-25-2012, 11:12 AM   #4
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That's what I was thinking about the blanket insulation. I'll end up taking it down and using the #8 example like you are doing. Thanks for your help on that.
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