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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>Clay is remarkable in buildings. Years ago we developed a clay paint (basically clay, chalk, casein) that was used in a lot of projects. It was incredibly durable but would waterspot or stain if splashed heavily. Avoided using it around wet areas (kitchens, baths). Ok on a feature wall that wasn’t prone to splashing. In bathrooms I often used cement stucco finishes (generally smooth polished). <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>I experimented with wax paint which was quite amazing as a phase change material – quickly modifying temperature (great in kitchens). Quite a variety of traditional materials that are well suited to various purposes and rooms. <o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></a></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Lynelle Hamilton<br><b>Sent:</b> Tuesday, December 19, 2017 6:24 AM<br><b>To:</b> greenbuilding@lists.bioenergylists.org<br><b>Subject:</b> Re: [Greenbuilding] dehumidifying bathrooms - makeup air?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p><span style='font-size:13.5pt;font-family:"Gill Sans MT","sans-serif"'>Stephen, where do you get the clay you're planning to use? I'm not near doing the bathroom yet, but would like to use it.</span><o:p></o:p></p><p><span style='font-size:13.5pt;font-family:"Gill Sans MT","sans-serif"'>Thanks,</span><o:p></o:p></p><p><span style='font-size:13.5pt;font-family:"Gill Sans MT","sans-serif"'>Lynelle </span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 2017-12-19 9:19 AM, Stephen Collette wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Hello Reuben and all <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Yes, Reuben, there are building materials that have been used since time immemorial that can safely manage moisture generated without resulting in damage and ultimately mould growth. Hygroscopicity is the rate at which moisture can be adsorbed by the material. The greater the hygroscopicity, the greater the rate it can take moisture in, and release it. Materials that have high rates of hygroscopicity are unbaked clay, unfinished wood and cork for example. Hygric buffering capacity is the term that looks at how much water the material can safely store/hold/then release before it fails. Again, a higher value means it can hold more. The Lstiburek/Carmody book Moisture Control Handbook made mention (if I remember correctly) of a steel stud with drywall building holding something like 5 gallons of water, while a brick building could hold 500 gallons safely. Brick being fired cannot hold anywhere near as much as unfired clay, which is used in plaster or unfired adobe in your case in your bathroom. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I have some slides, but I can’t upload them to the group so send me a PM and I’ll send them to you.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Cheers<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Stephen<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><div><div><div><div><p class=MsoNormal>Stephen Collette <o:p></o:p></p></div><div><p class=MsoNormal>BBEC, BBNC, LEED AP, CAHP, BSSO<o:p></o:p></p></div><div><p class=MsoNormal>Principal<o:p></o:p></p></div><div><p class=MsoNormal><b><i>Your Healthy House</i></b> <o:p></o:p></p></div><div><p class=MsoNormal><span class=apple-style-span><span style='font-size:7.5pt'>Indoor Environmental Testing & Building Consulting</span></span><o:p></o:p></p></div><div><p class=MsoNormal><a href="http://www.yourhealthyhouse.ca">http://www.yourhealthyhouse.ca</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="mailto:stephen@yourhealthyhouse.ca">stephen@yourhealthyhouse.ca</a><o:p></o:p></p></div><div><p class=MsoNormal>705.652.5159<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div><div><p class=MsoNormal><br><br><o:p></o:p></p><div><p class=MsoNormal>On Dec 18, 2017, at 2:00 PM, <a href="mailto:greenbuilding-request@lists.bioenergylists.org">greenbuilding-request@lists.bioenergylists.org</a> wrote:<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Stephen,<br>that is so fascinating. I deeply appreciate these insights and reminders of<br>things we (or at least I) had forgotten. One question right off - materials<br>that store and release moisture - are these categorically different from<br>the materials we regularly see harboring mold? Like caulk, latex paint,<br>drywall? I'd be delighted to pursue these ideas!</span><o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><br><br><br><o:p></o:p></p><pre>_______________________________________________<o:p></o:p></pre><pre>Greenbuilding mailing list<o:p></o:p></pre><pre>to Send a Message to the list, use the email address<o:p></o:p></pre><pre><a href="mailto:Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>to UNSUBSCRIBE or Change your List Settings use the web page<o:p></o:p></pre><pre><a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</a><o:p></o:p></pre></blockquote><p class=MsoNormal><o:p> </o:p></p><div id=DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=1 cellpadding=0 style='border:none;border-top:solid #D3D4DE 1.0pt'><tr><td width=55 style='width:41.25pt;border:none;padding:9.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank"><span style='text-decoration:none'><img border=0 width=46 height=29 id="_x0000_i1025" src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif"></span></a><o:p></o:p></p></td><td width=470 style='width:352.5pt;border:none;padding:9.0pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:13.5pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#41424E'>Virus-free. <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank"><span style='color:#4453EA'>www.avast.com</span></a> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p></div></div></body></html>