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Fwd: Re: Location of Vapor Barrier Below Concrete Slab on Grade

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For the practical application of it, always place the vapor barrier below a
3" sand cushion. That way it does not get damaged while pouring.

Shafat
 


At 05:12 PM 2/18/97 -0500, you wrote:
>Can anyone provide comments on the specific advantages/disadvantages of
>placing a slab on grade vapor barrier directly underneath the concrete slab
>or below a 3" sand cushion?
>
>We are designing a slab on grade system for a office/warehouse facility for
>which the Geotechnical report does not require the installation of a vapor
>barrier.  However, the flooring system the tenant requires will only
>install/warranty their product if a vapor barrier is provided.  The vapor
>barrier system they would like to use ("Premoulded Membrane Vapor Seal" from
>W.R. Meadows or "Moistop" from Fortifiber) recommends placing the vapor
>barrier directly below the concrete slab while specifying a concrete mix
with
>as low a water-cement ratio as practical, low slump, and wet curing to
reduce
>differential shrinkage and slab edge curling.  ACI and PCA recommend a 3"
>sand cushion to reduce differential shrinkage and curling regardless of the
>type of vapor barrier used.
>
>Please respond ASAP.  Thank you.
>
>John Carroll, Structural Engineer
>The McSherry Group, Inc.
>email:  mcsherrygp(--nospam--at)aol.com
>



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