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how do i put a fire break in with foam insulation already on walls?

how do i put a fire break in with foam insulation already on walls?

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  #1  
Old 03-29-14, 12:19 PM
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how do i put a fire break in with foam insulation already on walls?

hey guys,

i already put rigid foam and framed the exterior walls of my basement, what i need to know is as far as a fire break is concerned, can i just butt 2x4 boards up against the foam or do i need to cut slots into the foam to go all the way out to the foundation?
 
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Old 03-29-14, 01:08 PM
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As long as it's flush with the studs, it should be fine.
 
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Old 03-29-14, 07:32 PM
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If the foam is combustable, doesn't just having the 2x4s butted up against and not through the foam mean that if a fire starts the foam would melt and a hole would open up behind the 2x4s?
 
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Old 03-30-14, 06:32 AM
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If you put the fire block against the wall, wouldn't that leave the same space on the front side of it?
 
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Old 03-30-14, 09:07 AM
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I don't think that matters as far as a draft stop is concerned. If the top plate of your wall is still accessible, cap it between the joists with 1/2" plywood or 1/2" drywall that is about 4 1/2" wide so that it covers the top edge of the foam. Or you could use cans of fire rated foam.

I don't think it's an issue, however.
 
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