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RE: Capillary Breaks
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Capillary Breaks
- From: "Garner, Robert" <rgarner(--nospam--at)moffattnichol.com>
- Date: Wed, 9 Feb 2005 12:56:39 -0800
Not sure how relevant this is. I've
had cracking problems with slabs placed directly on vapor barriers. There
needs to ba a way for bleed water to exit the bolttom of the slab, and placing
capillarity break material on top of the vapor barrier seems to help in
this. Also, this seems to provide some protection for the vapor barrier
during bar and concrete placement.
Bob Garner, S.E.
In a message dated 2/9/2005 2:45:58 PM Eastern Standard Time,
I think maybe the "capillary
break" above a vapor barrier is just to provide somewhere for bleed
water to go so it doesn't accumulate on the bottom of your slab. If there
were no vapor barrier, you would want a real "capillary break" to keep the
soil from pulling water out of the mix.
That was kind of my assumption too - but then you get into the ACI
302/360 discussion about whether there should be a granular layer above the
And a capillary break needs to be more or less the same size particle so
that it is very free draining. And that kind of material is not easy to
compact well. Whatever goes on top of the vapor retarder has to be
compactible. So to call for a "capillary break" on top of the
vapor retarder does not seem to make sense.
I am not sure who the guy that wrote the article is - he's a salesman,
for all I know his qualifications are that he has a degree in automotive
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