Slab foam debate — contractor going bonkers
I want to do a slab on grade for the house that would consist of compacted AB, then 3″ of EPS 2.0LB rigid foam, a vapor barrier and then 4″ of reinforced concrete.
Oh boy, did I open Pandora’s Box!
One concrete contractor said my buildup will result in the concrete “shattering” and that I will get hairline cracks everywhere. He wants to put the foam UNDERNEATH 4″ of AB and no vapor barrier. He said I would have to sign off on waivers if I did my buildup my way.
How would one put the foam underneath 4″ of compacted AB? Is this normal practice? No vapor barrier?
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