[Strawbale] Frost Heave-basement/cob

[GuyW]

gee...millions of dollars has changed hands in SoCal over vapor-emissions
thru concrete....There are standard sodium chloride dome tests to quantify
vapor transmission thru concrete...guess not, tho...


----- Original Message -----
From: "Speireag Alden" <speireag at gmail.com>
To: <STRAWBALE at LISTSERV.REPP.ORG>
Sent: Monday, November 26, 2007 5:13 PM
Subject: Re: [Strawbale] Frost Heave-basement/cob


>
> On 2007, Nov 26, at 19:41, GuyW wrote:
>
>> "The main con is substantial:  the existing concrete foundation is
>> a very
>> effective vapor barrier...."
>>
>> ? Concrete is vpor-permeable, yes?
>
>     In general, no, especially not four to eight inches of it, as
> found in most foundation walls.
>
>     Thin concrete can be made vapor permeable.  But you have to
> intend it.
>
> -Speireag.
>
>
> _______________________________________________
> Strawbale mailing list
> Strawbale at listserv.repp.org
> http://listserv.repp.org/mailman/listinfo/strawbale_listserv.repp.org