[Strawbale] Frost Heave-basement/cob

[Mark BP / Low Energy Design Ltd]

vapour or liquid?
Mark


GuyW wrote:

>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.
>>
>>
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