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Slab on Grade Vapor Retarder Design

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I need a reference for the design of a vapor retarder under a concrete slab
on grade.  

I understand that a layer of sand over a plastic vapor retarder as
protection against construction traffic damage is no longer recommended due
to the tendency for the sand between the plastic vapor retarder and the slab
to become a reservoir for water that may damage a moisture sensitive floor
covering.  I understand that the current practice is to place the concrete
slab directly onto the vapor retarder.  What is the recommended appropriate
mil-weight for the traffic-resistant plastic sheet, or where can I find a
reference that provides guidance for selecting the appropriate plastic

Nels Roselund, SE
South San Gabriel, CA

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