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Re: Slab on Grade and the Green Code

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Hello Chuck & Board,

Thank you for all of your responses.  I realize that Oshin started
this thread, but I appreciate all of the great input and links to
articles on this subject.  I have learned much.

My approach was from information gleaned from old concrete
installers, who preferred the sand.  When I asked about why it's
there, they tried to answer me with what must have made sense
to them.  I have learned today, that there is a better approach to
determining when and where to use a vapor barrier.

Thank you,

On 5 Dec 2013 at 13:35, Chuck Utzman wrote:

> I just got back from a job site. I took a look at some 6 mil visquene
> that was removed during some demo work. It looked like one of
> grandma's lace curtains. The sand hides the punctures, but can't
> prevent them in a crummy 6 mil vapor barrier. Also, the workers walk
> around on the rebar & embed the dobbies & rebar into the sand. If the
> concrete is pumped it can move the sand into contact with the rebar.
> The ASTM piece goes into this at length & it's partially discussed in
> some of the articles in this thread. Chuck Utzman,PE ps It's nice to
> see that there are still some of us still watching the list server

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