Missing Vapor Retarder Under Slab
Adding on (w/ full basement) to house in eastern MA. Very well draining soil.
Foundation walls are up. Foundation guy poured the slab today and forgot the poly sheet underneath. Probably not a full 4″ slab. Probably only 2″ gravel underneath. Addition is maybe 300 sqft
Main (existing house) is 1960s, no with no poly under the basement slab obviously. But we’d like to finish the new basement.
Should I have him remove the slab and start over? That would entail jackhammering near the new footers. Or is there an alternative?
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