<div dir="ltr">I second Matts' whitewash idea. If it works for politicians, it should work to keep us Out on Bale.<div><br></div><div>John "Whiter whites and Greener greens" Swearingen</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Thu, Jun 19, 2014 at 5:14 PM, Matts Myhrman <span dir="ltr"><<a href="mailto:mattsmy@gmail.com" target="_blank">mattsmy@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div>Wondering if a lime wash would delete the spots permanently. Easy to test in a small area. Would also lighten up the space.<br><br></div>Matts (If all else fails, whitewash it) Myhrman at (Still) Out On Bale.<div>
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<div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jun 19, 2014 at 4:57 PM, Graeme North <span dir="ltr"><<a href="mailto:graeme@ecodesign.co.nz" target="_blank">graeme@ecodesign.co.nz</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi James<div><br></div><div>The spots look like a very typical interaction that sometimes happens between wet clay and organic matter - and is most likely the result of a fermentation process in action.</div>
<div>It can take months for the stains that can result to develop as moisture migrates through the material, as you have found out. The end result from fermentation usually toughens up the wall material, but if uneven fermentation takes place within the wall, will typically cause staining. It appears that it may be related to the position of the bamboo that is nearest the surface of the wall, i.e. where the daub is thinnest, for some reason that eludes me.<div>
It is not harmful but can be persistent, and can look disfiguring. </div><div>Not a very nice idea, but bleach can sometimes remove these marks.</div><div> </div><div>I think that the very worst thing would be to put a cement based anything on the interior of these walls - that will stop it breathing, trap moisture within the wall, and could lead to all sorts of problems, esp if the spots are related to ongoing moisture migration of any kind within the wall. I am not sure of the traditional houses are now typically rendered on the outside with cement paint, but if they are not, and do not get spots on them, then this may point to the cause and a solution too, as cement based paint will act as a moisture barrier and hold moisture within the walls. </div>
<div><br></div><div>The traditional render sounds good to me. If it cracks the addition of more aggregates should help, i.e. adding in more rice husks and fibre, or sand if any is available.</div><div>After 6 weeks the plaster should have fermented nicely and give a nice even colour! </div>
<div><br></div><div>Maybe this may help</div><div><br></div><div> <br><div>
<span style="border-collapse:separate;border-spacing:0px"><div style="font-size:12px">Graeme </div><div style="font-size:12px">Graeme North Architects</div><div style="font-size:12px">49 Matthew Road</div><div style="font-size:12px">
RD1</div><div style="font-size:12px">Warkworth 0981</div><div style="font-size:12px">tel/fax <a href="tel:%2B64%20%280%299%204259305" value="+6494259305" target="_blank">+64 (0)9 4259305</a></div><div style="font-size:12px">
<br></div><div style="font-size:12px"><a href="http://www.ecodesign.co.nz" target="_blank">www.ecodesign.co.nz</a></div><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:medium"><div style="word-wrap:break-word">
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<br><div><div>On 18/06/2014, at 8:43 AM, James's <<a href="mailto:james.henderson8@bigpond.com" target="_blank">james.henderson8@bigpond.com</a>> wrote:</div><br><blockquote type="cite"><div dir="auto"><div>Does anyone have any ideas for Sona?</div>
<div>Thanks James<br><br>Sent from my iPad</div><div><br>Begin forwarded message:<br><br></div><blockquote type="cite"><b>From:</b> Sona Huberova <<a href="mailto:sonahuberova@yahoo.com" target="_blank">sonahuberova@yahoo.com</a>><br>
<b>Date:</b> 16 June 2014 9:47:39 AM AEST<br><b>To:</b> James Henderson <<a href="mailto:james.henderson8@bigpond.com" target="_blank">james.henderson8@bigpond.com</a>><br><b>Subject:</b> <b>School built in Nepal - Seek for advise</b><br>
<b>Reply-To:</b> Sona Huberova <<a href="mailto:sonahuberova@yahoo.com" target="_blank">sonahuberova@yahoo.com</a>><br><br></blockquote><div><span></span></div><blockquote type="cite"><div style="background-color:rgb(255,255,255);font-family:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;font-size:10pt">
<div style="margin-bottom:0cm">Dear James,</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">my names is Sonia and we met at the
EBAA conference last year, we are the couple with the school in
Nepal. I have to organize fixing some defects on this first building
now and would like to ask for your opinion in one particular matter.
I just started to read your book so I thought that you may be able to
help us.
</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">As you may remember, the school is
built with bamboo frame and wattle and daub walls, weaved and
plastered from two sides. After a couple months, spots appeared on
the inside of the walls, you can see in the attachment. The spots are
not seen on the outside, but we think that it is because the facades
were painted with cement-based paints at the end of construction,
which did not happen in the interiors.</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">We are planning to fix the spots by
painting the interiors with similar paint, although I am not sure it
will solve it for good. But we are puzzled why did the spots appear
in the same place. We let the villagers to mix and render the walls
in their traditional way, so the mixture is as follows:</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">3 parts of soil (half in half mixed
from two soils, one more clayey, one less)
</div><div style="margin-bottom:0cm">1 part of rice husks</div><div style="margin-bottom:0cm">1 part forest grass finelly chopped</div><div style="margin-bottom:0cm">1 part cow/buffalo dung</div><div style="margin-bottom:0cm">
<br>
</div><div style="margin-bottom:0cm">The mixture has been left to rest for
six weeks or more. We were told that this is the traditional way to
render, and the mixture indeed was very strong after drying, alhough
cracked a lot and two more coats were needed to finish it. I am not
sure what sort of mixture they used for the final layers, but it
would againg be just a combination ot the above mentioned.</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">Some of the walls were then filled with
loose soil, but we abandonned this so not all of them are. the spots
appear on the filled one as well as on the empty ones.</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">We are surprised at finding the spots
as none of the local houses, rendered in this traditinal way have
this problem.</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">Would you have an idea what may have
caused it? Have you ever encountered or heard of this sort of
spotting?</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">Bamboo elements were pressure-treated
with solution of Acid Boric and Borax, do you think that may be the
problem?
</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">We are planning to build more of those
school buildings in Nepal based on a standardized project, so we will
need to avoid the defects and their causes in future.</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">Sorry for bothering you with it and I
would understand if you did not have time to answer to me.</div><div style="margin-bottom:0cm"><br>
</div><div style="margin-bottom:0cm">Kind regards</div><div></div><div> </div><div><span style="font-size:15.555556297302246px;line-height:normal;font-family:Arial,sans-serif;color:rgb(45,45,45)">Sona Huberova</span><span style="color:rgb(69,69,69);line-height:normal;font-size:10pt;font-family:Arial,sans-serif"><br>
<a href="tel:%2B61%20466%20482%20682" value="+61466482682" target="_blank">+61 466 482 682</a></span></div><div><font style="color:rgb(45,45,45);font-weight:bold" size="3">meem</font><font style="color:rgb(45,45,45)" size="1">ARCHITECTURE</font><br style="color:rgb(45,45,45)">
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</div></blockquote><blockquote type="cite"><span><Classroom walls_1.jpg></span></blockquote><blockquote type="cite"><span><Classroom walls_2.jpg></span></blockquote><blockquote type="cite"><span><Classroom walls_3.jpg></span></blockquote>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <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>
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