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Old 05-03-2010, 02:44 PM   #1
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To the fireblock gurus...


Okay so here is a pic of a wall in my basement...

http://i798.photobucket.com/albums/y...l/IMG_3009.jpg

It is between my one basement room and the garage.
I have since leveled out that chase/soffit and cleaned up the wiring.
There is a 2x6 wall with a 2x4 wall in from of it.
The soffit then comes from the 2x4 wall to ceiling.

This wall is going to be insulated.
Do I need to worry about fireblocking?
It seems like some of the things I read say that you don't need it if the wall is going to be insulated.
To add blocks to the bottom of the soffit in the 2x4/2x6 wall would mean there is no insulation up there.

Then I read that I have to use unfaced insulation.
So then what to do about a vapor barrier...
Or, since it is going to a garage wall, do I even need a vapr barrier/faced?
And do I buy enough for the 2x6 and then enough for the 2x4?

I am so confused!

Thanks,
Jamie

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Old 05-03-2010, 11:00 PM   #2
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To the fireblock gurus...


Not sure what kind of fireblocking you were thinking of. Check with your inspector as to what's required. Usually it's the drywall they are concerned about between the garage and house. 5/8 drywall is usually sufficient but you'd better check.
I'd stuff both walls full of insulation if it were me and we always put a vapor barrier on the house side.

Fireblocking is usually blocks to keep the fire from travelling up a wall between floors. Is that what you mean?

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jbatl (05-04-2010)
Old 05-04-2010, 09:58 AM   #3
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Yeah - those are the blocks I am talking about...
There is a topic by kctermite about fireblocking.
I understand that I need to sealoff other walls - but I am unsure about this one.
It seems like I need to make sure that smoke/fire can't get through the soffit to the floor joists.

And it just gets confusing when people talk about insulation as being one of the acceptable ways to firestop - b/c it sounds like I can just use insulation - but since it is an outside wall I need a vapor barrier. But, I can't use kraft faced insulation - so maybe unfaced insulation with a plastic vapor barrier...
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