[Greenbuilding] [BULK] Vapor Barrier Paint

[William Updike]

Thanks Lawrence.  I have read the Building Science
stuff and am on board.  But this project is a SIP
build and their warranty requires us to use a vapor
barrier, so I'm doing my best to find the most "green"
option.  

There's this option from Vimasco:

http://www.vimasco.com/749.html

Has anyone used it?  Know the price?

Cheers,
Bill

--- Lawrence Lile <LLile at projsolco.com> wrote:

> No, and I would no longer recommend using vapor
> barrier paints in most
> situations!  Study why at this site:
> 
> 
> http://www.buildingscience.com/bsc/
> 
> We used to wrap whole houses in plastic, but no
> more.  
>  
> Current thinking about vapor barriers and retarders
> has changed
> radically in the last 15 years.  Many of the walls
> that were built with
> heavy duty vapor barriers in the 1970's are now
> soaked with water and
> growing lots of mold.  Walls need to dry, as much as
> they need to have
> moisture locked out.  
> 
> Very little of the moisture that gets into a wall
> moves through building
> materials.  Most of it either is transported by bulk
> air leakage, where
> moist air contacts cold surfaces and drops its load,
> or bulk water
> leakage due to poor drainage plane details. 
> Caulking around electrical
> penetrations in sheetrock, for example, will do more
> to keep moisture
> out of the wall than ten layers of vapor barrier. 
> Read the link above,
> it is a wealth of informaiton.
> 
>  
> Lawrence Lile, P.E., LEED AP
> 
> 
> -----Original Message-----
> From: greenbuilding-bounces at listserv.repp.org
> [mailto:greenbuilding-bounces at listserv.repp.org] On
> Behalf Of William
> Updike
> Sent: Thursday, March 01, 2007 8:58 AM
> To: Greenbuilder list
> Subject: [BULK] [Greenbuilding] Vapor Barrier Paint
> Importance: Low
> 
> Does anyone know of any low or no-VOC vapor barrier
> paints (<1 perm)?
> 
> How 'bout a low or no-VOC fire retardent paint?
> 
> Thanks!
> 
> Cheers,
> Bill Updike
> 
> 
>  
>
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