Cost difference is very small. Since you asked the same question about the walls, you should know my answer is the same. If you want to do everything by the book as far as basement construction goes, you should use it since it is built against the slab. My walls had a thin layer of foam under them and my stage/riser has felt. Since I won't ever really get major flooding, I just didn't care.
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Making the "Bacon Race" Theater - Page 5
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(Vapor barriers, slab condensation, etc.)


































