Originally Posted by Cerberus
Isn't the spray foam going to bridge the gap between the studs and the concrete wall? If so, why do you need a special firebreak?
First: I am glad that I read the code correctly.
Cerberus: My thoughts exactly, but alas closed cell spray foam (at least the foam that I will have sprayed on the walls) is considered a combustible material. I assumed that the building inspector would fail me if I used the spray foam bridging that you just talked about.
I am more worried about this vertically mounted material (whatever I choose) being a moisture wick/mold problem.
Here is my current thoughts about how I'm planning to do this: (Not actually my thoughts, but the spray foam contractors thoughts)
He has seen other contractors use 1/2 drywall sheet about 4" wide nailed vertically along the full height of the stud wall every 8 ft (every 6 studs), and brought into close proximity of the basement wall, but not actually touching. The spray foam contractor then comes in behind it with the spray foam. The spray foam will fill the small gap along the edge of the drywall to minimize any moisture transmisison issues, and the rest of the space is filled with sprayfoam as normal. The entire studd wall and concrete wall will become one solid mass as the sprayfoam bridges the gap between the wall and the studs.
BTW: My wife agrees with the person saying I am too concerned with this. My wife thinks I am nuts!.
Does anyone have positive or negative comments on my proposed solution?