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RE: Slab on Grade and the Green Code

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The location of the vapor barrier (referred to as a vapor retarder in 
MasterSpec) is a function of a number of different factors.

There is a nice flow-chart in this old article:


D. Matthew Stuart, P.E., S.E., F.ASCE, F.SEI, SECB, MgtEng
Structural Division Manager
Pennoni Associates Inc.
One Drexel Plaza
3001 Market Street, 2nd Floor
Philadelphia, PA 19104
Office 215-222-3000 x7895 | Direct 215-254-7895
Fax 215-222-0789 | Mobile 908-309-8657 | mstuart(--nospam--at)

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Lloyd Pack Sent: Thursday, December 05, 2013 11:57 AM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Slab on Grade and the Green Code

Hello Oshin & Board:

Have you been able to get any information on why the GBC wants no sand over 
 the vapor barrier?  How do the writers of the GBC expect the concrete to 
be installed without puncturing the typical plastic sheet, 0.006" thick, 
that is used as a vapor barrier?

I'm sure that you know this, but the sand is used over the gravel/base to 
protect the underside of the plastic and it's used over the plastic to 
protect the plastice from puncture from workers stepping on the large 
aggregate in the concrete while placing and screeding the concrete.

It would seem that the negatives of puncture, e.g. allowing vapor through 
the barrier, outweigh the benefits of not using sand to protect the 

I would be curious to know what the creators of the GBC have to say on this 

Take Care,

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