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RE: Vapor Barrier

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It's my understanding that this was not intended to be a structural
requirement, but was established to prevent moisture from rising up through
cracks in the slab and into the building. It has been required on both
residential and commercial projects in the area's I worked.
Dennis Wish PE

-----Original Message-----
From: Donald L. Carr [mailto:dcarr(--nospam--at)]
Sent: Wednesday, October 14, 1998 6:26 AM
To: seaint(--nospam--at)
Subject: Re: Vapor Barrier

I have been following the discussion of the vapor barrier and the
sand or gravel layer under a slab.
Can anyone help me with a question?
 " Is this a detail you would specify for a commercial slab
on grade design, a residential slab design, or any ground slab design
depending on the loading conditions?"
Thanks for your opinions.
Don Carr

Donald L. Carr
NAHB Research Center, Inc.
400 Prince Georges Blvd.
Upper Marlboro, MD 20774
301-249-4000 x575