<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif; "><div><div>Good morning Sven,Derek and All,</div><div><br></div><div>The use of cement is to have an early "go hard" element to the plaster for speed of lay up only – there is a downside to using too much cement as indicated by you Sven in so far as it "holds" free water in the matrix which we can safely assume to induce rotting (as we see when timbers contact concrete) AND a huge reduction in vapor permeability ALSO an increase in water transport through the plaster i.e. It is not desirable and literature shows that a maximum is 1 : 3 : 9 cement : hydrated lime (lime putty is preferred) : sands (clean sharp non pozolanic) we used on the Canada project 1 : 1: 9 plasterers lime (50% cement 50% lime powder) : hydrated lime (fresh builders lime powder) : sharp sand which worked well. - this stuff ail still crack if laid up too wet and allowed to drying to fast !</div><div><br></div><div>I mention pozolanic sands and soils as here in New Zealand with its active geological belts we find great soils near volcanoes (parts of Northland) and sands which are washed out flood plains from old volcanoes (Waikato and surrounding plains) where the sands naturally induce a "hydraulic" reaction with the lime putty (i.e. They cure under water although rather slower than portland cements)</div><div><br></div><div>In conclusion :</div><div>1) I recommend wrapping the building with a wind stop (as we see here around Auckland) for leaky building remediation where the scaffolding is enclosed in a vapor permeable and translucent plastic wrap and all work is protected from rain, wind, and cold temperatures - plasters do not perform if subject to freeze (10oC and below) which includes hyperthermic consideration of cold and/or strong winds swirling around the building </div><div>2) use a lime putty and sands plaster – mix the sand sizes for greater bind and strength (5 mm down)</div><div>Regards</div><div><br></div><div>ian</div><div> </div><div><!--[if !mso]>
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<p class="MsoNormal"><span style="font-size:8.0pt;color:#595959;mso-themecolor:
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<b>Adobe South</b><br>
<b>A:</b> 5 Lancewood Rise, Onerahi, Whangarei<br>
<b>P:</b> 09 436 4040 <b>M:</b>
027 490 2324<br>
<b>E:</b> ian@adobesouth.co.nz<o:p></o:p></span></p>
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none;mso-border-insidev:none"><tbody></tbody></table><!--EndFragment--></div></div></div></div><div><br></div><span id="OLK_SRC_BODY_SECTION"><div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style="font-weight:bold">From: </span> Sarah Johnston <<a href="mailto:sol_design@yahoo.com">sol_design@yahoo.com</a>><br><span style="font-weight:bold">Reply-To: </span> Sarah Johnston <<a href="mailto:sol_design@yahoo.com">sol_design@yahoo.com</a>>, Global Straw Building Network <<a href="mailto:GSBN@sustainablesources.com">GSBN@sustainablesources.com</a>><br><span style="font-weight:bold">Date: </span> Wednesday, April 30, 2014 9:12 AM<br><span style="font-weight:bold">To: </span> Global Straw Building Network <<a href="mailto:GSBN@sustainablesources.com">GSBN@sustainablesources.com</a>><br><span style="font-weight:bold">Subject: </span> Re: [GSBN] lime over hessien/ Cement Lime.<br></div><div><br></div><div><div><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:10pt"><div><span>Good question Derek. The concern was aired by a friend who had read (somewhere) that the most reliable mixes either had no cement or at least equal portions of cement and lime..... I do not know why, thus my asking. </span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; "><span><br></span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; "><span>Perhaps it is due to the lime not being cured well if the plaster sets 'quickly' due to the cement portion and the plaster not being kept moist long enough for the lime to cure? More an application issue than a mix issue...?
This is assuming my</span> understanding is correct that the lime does not become pozzolanic but is still standard calcium hydroxide trapped in the hardened cement. </div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; "><br></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; ">We are working with calcium hydroxide as we can not buy NHL here in NZ.</div><div></div><div> </div><div>Cheers,</div><div>Sven</div><div></div><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"><div style="font-family: 'times new roman', 'new york', times, serif; "><div style="font-family: 'times new roman', 'new york', times, serif; "><div dir="ltr"><font><br> </font>
</div><div dir="ltr"><font><br></font></div> <div class="y_msg_container" style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><br><div id="yiv8071508538"><div><div>Can you say more about your concerns, Sven? Given that mixes of roughly 0:1:3 (Portland cement:lime:sand) have been used successfully for more than 2000 years, and many of these structures are still in existence, it’s clear that Portland cement isn’t
a requirement for durability. Of course, it has pluses and minuses. </div><div><br clear="none"></div><div>Derek</div><br clear="none"><div><div>On Apr 29, 2014, at 9:05 AM, Misha Rauchwerger <<a rel="nofollow" shape="rect" ymailto="mailto:misha.rauchwerger@gmail.com" target="_blank" href="mailto:misha.rauchwerger@gmail.com">misha.rauchwerger@gmail.com</a>> wrote:</div><br clear="none" class="yiv8071508538Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div><div>We used a Natural Hydraulic Lime on straw bale mix of 1:2:9 (cement:Lime:sand) with good results<br clear="none"><br clear="none"></div>
Misha Rauchwerger<br clear="none"></div><a rel="nofollow" shape="rect" target="_blank" href="http://BuiltInBliss.com/">BuiltInBliss.com</a><br clear="none"><div><div><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"></div></div></div><div class="yiv8071508538gmail_extra"><br clear="none"><br clear="none"><div class="yiv8071508538gmail_quote">On Fri, Apr 25, 2014 at 11:04 AM, Sarah Johnston <span dir="ltr">
<<a rel="nofollow" shape="rect" ymailto="mailto:sol_design@yahoo.com" target="_blank" href="mailto:sol_design@yahoo.com">sol_design@yahoo.com</a>></span> wrote:<br clear="none"><blockquote class="yiv8071508538gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="font-size: 10pt; font-family: 'times new roman', 'new york', times, serif; "><div><span>Thank you to all who gave input on this subject!</span></div><div style="font-style: normal; font-size: 13px; background-color: transparent; font-family: 'times new roman', 'new york', times, serif; "><span><br clear="none"></span></div><div style="font-style: normal; font-size: 13px; background-color: transparent; font-family: 'times new roman', 'new york', times, serif; ">
Further talks with the client have led to a full vented cavity for this project which means there is no Hessian involved any more. They want to hang plaster on the exterior so they will still be having some challenges in their conditions but the straw will
be well protected even if they have plaster failures.</div><div style="font-style: normal; font-size: 13px; background-color: transparent; font-family: 'times new roman', 'new york', times, serif; "><br clear="none"></div><div style="font-style: normal; font-size: 13px; background-color: transparent; font-family: 'times new roman', 'new york', times, serif; ">
What mixes for lime cement are people using? I believe Chris Magwood has gone as far as a 1 cement 3 lime and achieved good results. Are others getting positive, durable results from mixes with low cement ratios?</div><div style="font-style: normal; font-size: 13px; background-color: transparent; font-family: 'times new roman', 'new york', times, serif; "><br clear="none"></div><div></div><div> Sven Johnston </div><div>Sol Design, Ltd. <br clear="none">
50A Connolly Street <br clear="none">
Geraldine 7930 New Zealand <br clear="none">
03 693 7369 <br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:sol_design@yahoo.com" target="_blank" href="mailto:sol_design@yahoo.com">sol_design@yahoo.com</a> <br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.soldesign.co.nz/">www.soldesign.co.nz</a></div><div><br clear="none"></div><blockquote style="border-left:2px solid rgb(16,16,255);margin-left:5px;margin-top:5px;padding-left:5px;"><div style="font-size: 10pt; font-family: 'times new roman', 'new york', times, serif; "><div style="font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; "><div dir="ltr"><hr size="1"><font face="Arial"><b><span style="font-weight:bold;">From:</span></b> Derek Stearns Roff <<a rel="nofollow" shape="rect" ymailto="mailto:derek@unm.edu" target="_blank" href="mailto:derek@unm.edu">derek@unm.edu</a>><br clear="none"><b><span style="font-weight:bold;">To:</span></b> Global Straw Building Network <<a rel="nofollow" shape="rect" ymailto="mailto:GSBN@sustainablesources.com" target="_blank" href="mailto:GSBN@sustainablesources.com">GSBN@sustainablesources.com</a>>
<br clear="none"><b><span style="font-weight:bold;">Sent:</span></b> Wednesday, 23 April 2014 9:44 AM<br clear="none"><b><span style="font-weight:bold;">Subject:</span></b> Re: [GSBN] lime over hessien<br clear="none"></font></div><div><br clear="none"><div><div>I’m thinking that a two-story house that routinely faces 100km/hr winds isn’t the location where I would like to be gambling. Many people posting have indicated that the clay plaster to lime plaster interface is a point of uncertainty. There may not
be an approach that is both inexpensive and reliable. Building a ventilated rain screen system for the whole wall system would be expensive, but has the potential to be reliable. Using only lime plaster would be more expensive than applying a body coat of
clay, but it would increase my confidence. </div><div><br clear="none"></div><div>Andy Horn prepared a very interesting PDF on a lime/clay/dung plaster that was in use 100 years ago in South Africa. He has pictures that document great weather resistance in weather-exposed uses. Recent postings from Deva and Harry Francis via Rob Tom
point out that applying lime plaster on top of clay/lime plaster may be more reliable than lime over clay. Perhaps lime plaster over Andy Horn’s lime/clay/dung plaster would be worth some testing. </div><div><br clear="none"></div><div>Two years ago, I posted Andy's 2 MB PDF on the site of the 2012 ISBC, but I’m not sure if it is still available. The link below will let you download it, if you are interested. I will leave this link up for a couple of weeks. </div><div><br clear="none"></div><div><a rel="nofollow" shape="rect" target="_blank" href="https://www.dropbox.com/s/o42bruzrxim5cc5/Andy%20Horn%20Herbert%20Lime-Dung%20Plaster.pdf">https://www.dropbox.com/s/o42bruzrxim5cc5/Andy%20Horn%20Herbert%20Lime-Dung%20Plaster.pdf</a></div><div><br clear="none"></div><div>Derek</div><br clear="none"><div><div><div>On Apr 22, 2014, at 10:02 AM, Kyle Holzhueter <<a rel="nofollow" shape="rect" ymailto="mailto:nihondaigaku.kairu@gmail.com" target="_blank" href="mailto:nihondaigaku.kairu@gmail.com">nihondaigaku.kairu@gmail.com</a>> wrote:</div><br clear="none"></div><blockquote type="cite"><div></div><div dir="ltr"><div><div><div><div><div><div>Hello,<br clear="none"><br clear="none">
In Japan, there is a several hundred year history of applying Shikkui lime plaster over earthen walls. Further details are available at the links below, but I wanted to point out a couple prominent features:<br clear="none"></div>
1. Addition of seaweed glue to improve adhesion and moisture retention <br clear="none"></div>
2. Minimal sand is used, which reduces the weight of the plaster and improves adhesion to the earthen plaster.<br clear="none"></div>
3. Addition of hemp fibers to improve flexibility and bending strength<br clear="none"></div>
4. Depending on the level of exposure, Shikkui finishes are expected to last about 20 years. Exposed walls will experience delamination earlier, protected walls will stay in good condition much longer. In this sense, the Shikkui finish is a kind of sacrificial
layer.<br clear="none"><br clear="none"></div>
You might find the following links helpful:<br clear="none"></div><div><div><div><a rel="nofollow" shape="rect" target="_blank" href="http://japaneseplastering.blogspot.jp/2014/02/shikkui-plaster-mixing-and-application.html">http://japaneseplastering.blogspot.jp/2014/02/shikkui-plaster-mixing-and-application.html</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://japaneseplastering.blogspot.jp/p/blog-page_25.html">http://japaneseplastering.blogspot.jp/p/blog-page_25.html</a><br clear="none"><br clear="none"></div><div>Yours in mud,<br clear="none"></div><div>Kyle</div></div></div></div></blockquote></div><br clear="none"><div><span style="border-collapse:separate;border-spacing:0px;">Derek Roff<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:derek@unm.edu" target="_blank" href="mailto:derek@unm.edu">derek@unm.edu</a></span><div><br clear="none"><br clear="none"></div></div><div><br clear="none"></div></div><br clear="none"><div>_______________________________________________<br clear="none">
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