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

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You've already gotten some good answers, but I'll add my  2 cents. The 
membrane, in addition to providing a vapor barrier, helps to control the 
moisture content during curing. The sand protects the membrane before 
casting the slab. When you cast concrete directly against earth, moisture 
drifts from the surface of the concrete into the soil  (one of the 
reasons for the 3" cover requirement.) Since slabs have a very large 
surface area/thickness ratio, you could end up with a bad cure, and 
shrinkage/curling problems.


.    .    .   .   .  .  .  .  . . . . . ...........................
Bob Shilling, SE             Berkeley, CA          shilling(--nospam--at)

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Richard Lewis, P.E.
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