[GSBN] Exterior plaster sealer?

[John Swearingen]

Tim,

I recall seeing something a long while ago, perhaps from John Straube, that
indicated that the addition of linseed to the plaster mix had little value.
 Am I misremembering, and that is something we know that we know, or is it a
well-known unknown.  What do you know?

John "UnOwned" Swearingen


On Sun, Jan 23, 2011 at 6:15 AM, Tim Owen-Kennedy <timok33 at gmail.com> wrote:

> When we built Ridge winery we built a test wall and finished it with lime
> plaster over earth plaster. Then we applied 16 different finishes and tested
> for cleanability (ability to take a light pressure washing or scrubbing) and
> checked behind the plaster, 2" in, and 4" in from the backside which was
> unplastered. Silane/siloxane was obviously the best but the oil entrained
> limewash was more than adequate. We didn't do long exposures to the hose but
> hosed the whole thing down three times after the pressure washer test. the
> whole thing was too subjective and sloppy of a test to write up but I can
> try and find my notes if anyone cares.
>
> We used 5% linseed oil by volume in our limewash, bended thoroughly and
> repeatedly. We were hoping this small volume wouldn't decrease vapor
> transference too much. Though, since this was the interior against the high
> humidity barrel storage room, we wanted to decrease it some. 10 years later
> there are no challenges and I just went back to do maintenace and checked
> all the walls I could.
>
> Tim
>
>
> On Fri, Jan 21, 2011 at 1:36 PM, Tom Hahn <tomhahn at econet.org> wrote:
>
>> There's that expertise I knew would come to the fore from John... :-)
>>
>> I misspoke in naming only "siloxanes", but most, if not all of what we
>> have used, including most of Enviroseal's products, are blends... and yes, I
>> agree with the need for a blend in alkaline compositions...
>>
>> Thanks for catching that, John!
>>
>> And, under the conditions described by Darrel, I also think the rainscreen
>> design (however it is best practiced...) is worth having as a backup plan,
>> in if an extensive retrofit is necessary.
>>
>> Tom
>>
>>
>>
>>  I agree : siloxanes are great. But silanes are more tolerant of highly
>>> alkaline substrates and hence why I recommend the blend (not sure how much
>>> lime is in the mix).
>>>
>>> John Straube
>>> 519 741 7920
>>> Sent via BlackBerry
>>>
>>> -----Original Message-----
>>> From: Tom Hahn <tomhahn at econet.org>
>>> Sender: GSBN-bounces at greenbuilder.com
>>> Date: Fri, 21 Jan 2011 07:33:02
>>> To: (private, with public archives) Global Straw Building Network<
>>> GSBN at greenbuilder.com>
>>> Reply-To: "(private, with public archives) Global Straw Building Network"
>>> <GSBN at greenbuilder.com>
>>> Subject: Re: [GSBN] Exterior plaster sealer?
>>>
>>> Ultimately, I'll defer to John's expertise with them, but we have
>>> also had good experience with siloxanes... admittedly not under such
>>> severe conditions as you describe, Darrel.
>>>
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>>
>
>
>
> --
> Tim Owen-Kennedy, Owner
> Vital Systems, natural building & design
> P O Box 751, Ukiah, CA 95482
> www.vitalsystems.net
> 888.859.6336
>
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>


-- 
John Swearingen
Skillful Means Design & Construction
2550 9th Street   Suite 209A
Berkeley, CA   94710
510.849.1800 phone
510.849.1900 fax

Web Site:  http://www.skillful-means.com
Blog:         https://skillfulmeansdesign.wordpress.com
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