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RE: Slab on Grade and the Green Code

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My answer would be, that I typically follow the referenced flow-chart - 
that's about as sophisticated as I get when it comes to underslab VB's.

D. Matthew Stuart, P.E., S.E., F.ASCE, F.SEI, SECB, MgtEng
Structural Division Manager
Pennoni Associates Inc.
Office 215-222-3000 x7895
Mobile 908-309-8657 | mstuart(--nospam--at)

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Andrew Kester Sent: Thursday, December 05, 2013 12:39 PM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Slab on Grade and the Green Code

I am curious as to where you fall in this discussion with your vast 
experience Mr. Stuart?

I have read articles that have lead me to believe this is a regional 
practice thing, and perhaps somewhat related to differing climates and 
water table levels?  In essence, the vapor barrier/sand/concrete design is 
a west coast or California detail, while much of the east coast is normally 
 slab directly on a vapor barrier? FWIW, in Florida the SOG is almost 
always placed directly on a vapor barrier. But many areas of Florida have 
high water table which can lead to high natural moisture content in the 
near surface soils, as well as dealing with very rainy summers and high 
humidity during construction.

Also, vapor barriers have come a LONG way. If using a vapor barrier 
directly under the slab, I would strongly recommending on going much 
thicker than 6mil to avoid a lot of the tearing and puncture issues.

Interesting subject, and thanks for that article Mathew.

I attached a pretty good article on the subject of slabs and moisture

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