Tim,<div><br><div>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?</div>
<div><br></div><div>John "UnOwned" Swearingen</div><div><br><br><div class="gmail_quote">On Sun, Jan 23, 2011 at 6:15 AM, Tim Owen-Kennedy <span dir="ltr"><<a href="mailto:timok33@gmail.com">timok33@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">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.<br>
<br>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.<br>
<br>Tim<div><div></div><div class="h5"><br><br><div class="gmail_quote">On Fri, Jan 21, 2011 at 1:36 PM, Tom Hahn <span dir="ltr"><<a href="mailto:tomhahn@econet.org" target="_blank">tomhahn@econet.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
There's that expertise I knew would come to the fore from John... :-)<br>
<br>
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...<br>
<br>
Thanks for catching that, John!<br>
<br>
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.<br><font color="#888888">
<br>
Tom</font><div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
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).<br>
<br>
John Straube<br>
519 741 7920<br>
Sent via BlackBerry<br>
<br>
-----Original Message-----<br>
From: Tom Hahn <<a href="mailto:tomhahn@econet.org" target="_blank">tomhahn@econet.org</a>><br>
Sender: <a href="mailto:GSBN-bounces@greenbuilder.com" target="_blank">GSBN-bounces@greenbuilder.com</a><br>
Date: Fri, 21 Jan 2011 07:33:02<br>
To: (private, with public archives) Global Straw Building Network<<a href="mailto:GSBN@greenbuilder.com" target="_blank">GSBN@greenbuilder.com</a>><br>
Reply-To: "(private, with public archives) Global Straw Building Network" <<a href="mailto:GSBN@greenbuilder.com" target="_blank">GSBN@greenbuilder.com</a>><br>
Subject: Re: [GSBN] Exterior plaster sealer?<br>
<br>
Ultimately, I'll defer to John's expertise with them, but we have<br>
also had good experience with siloxanes... admittedly not under such<br>
severe conditions as you describe, Darrel.<br>
</blockquote></div><div><div></div><div>
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</div></div></blockquote></div><br><br clear="all"><br></div></div><font color="#888888">-- <br>Tim Owen-Kennedy, Owner<br>Vital Systems, natural building & design<br>P O Box 751, Ukiah, CA 95482<br><a href="http://www.vitalsystems.net" target="_blank">www.vitalsystems.net</a><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><font face="'trebuchet ms', sans-serif"><span style="font-size:x-small"><font color="#666666">John Swearingen<br>Skillful Means Design & Construction<br>2550 9th Street Suite 209A<br>
Berkeley, CA 94710<br>510.849.1800 phone<br>510.849.1900 fax<br><br>Web Site: <a href="http://www.skillful-means.com" target="_blank">http://www.skillful-means.com</a><br>Blog: <a href="https://skillfulmeansdesign.wordpress.com" target="_blank">https://skillfulmeansdesign.wordpress.com</a></font></span></font><br>
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