Vapor Barrier Under Concrete Slab
Q: Does the concrete contractor normally install the vapor barrier between the ABC (crushed rock beneath the slab) and the concrete slab or does another company do it?
A: Generally, the concrete contractor would be responsible
for installing the vapor barrier before pouring the concrete slab since it is part of the preparation work along with setting forms, etc.
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by Kathy Maynard, reprinted courtesy of HomeAdvisor.com