<div dir="ltr">It raises the question of whether HP buildings in mixed humid climates need bi-directionally permeable walls and roofs. A bi-directionally drying wall would be like one of Ken Levenson's assemblies, with various arrangements of vented drainage planes, smart membranes, and permeable insulation and sheathing. see:<div>
<br></div><div><a href="http://foursevenfive.com/knowledge-resources/construction-details/">http://foursevenfive.com/knowledge-resources/construction-details/</a><br></div><div><br></div><div>An example of the opposite case, in which interior moisture must dry to the interior is the NIST Net Zero Energy Test House, with a double layer of foil faced polyisocyanurate over conventionally framed and insulated walls.<div>
<br></div><div>-AA</div></div></div><div class="gmail_extra"><br clear="all"><div><font><font><span style="color:rgb(102,0,0)">Alan Abrams</span></font><b style="color:rgb(102,0,0)"><br></b><i><span style="color:rgb(102,102,102)">certified professional building designer, AIBD<br>
certified passive house consultant, PHIUS</span></i></font><div><i><span style="color:rgb(102,102,102)">certified passive house builder, PHIUS</span></i><font><span style="color:rgb(102,0,0)"><font color="#666666"><i><br>
</i></font></span><font><span style="color:rgb(102,0,0)">Abrams Design Build LLC</span></font><font size="4"><br style="color:rgb(102,0,0)"><font><i style="color:rgb(102,0,0)">sustainable design for <font>intentional</font> living</i></font></font></font><font style="color:rgb(102,102,102)" size="1"><font><br>
</font></font><font style="color:rgb(102,102,102)" size="1"><font>cell </font></font><font style="color:rgb(102,102,102)" size="1"><font>202-437-8583</font></font><font style="color:rgb(102,102,102)" size="1"><font><br>
<a style="color:rgb(102,102,102)" href="mailto:alan@abramsdesignbuild.com" target="_blank">alan@abramsdesignbuild.com</a><br style="color:rgb(102,102,102)">
<a style="color:rgb(102,102,102)" href="http://www.abramsdesignbuild.com/" target="_blank">www.abramsdesignbuild.com</a></font></font><br></div></div>
<br><br><div class="gmail_quote">On Sun, Aug 24, 2014 at 10:06 AM, Clarke Olsen <span dir="ltr"><<a href="mailto:colsen@fairpoint.net" target="_blank">colsen@fairpoint.net</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">It seems intuitive to leave some windows open, and let the building breath, dare I say it, naturally.<br><div>
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Clarke Olsen<br><a href="http://clarkeolsendesign.com" target="_blank">clarkeolsendesign.com</a><br>373 route 203<br>Spencertown, NY 12165 <br>USA<br>518-392-4640<br><a href="mailto:colsen@taconic.net" target="_blank">colsen@taconic.net</a><br>
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<br><div><div class=""><div>On Aug 24, 2014, at 8:33 AM, "conservation architect" <<a href="mailto:elitalking@rockbridge.net" target="_blank">elitalking@rockbridge.net</a>> wrote:</div><br></div><blockquote type="cite">
<div lang="EN-CA" dir="ltr" link="blue" bgcolor="white" vlink="purple" style="font-family:Helvetica;font-size:medium;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">
<div class=""><div dir="ltr"><div style="font-size:10pt;font-family:Arial"><div style="font-size:small;text-decoration:none;font-family:Calibri;font-weight:normal;font-style:normal;display:inline">I have learned of some problems with college dormitories of a Passiv Haus building that was left unoccupied with not conditioned or ventilated with ERV over the summer and got some molding problems. I am wanting to inquire about what the best practices are for unoccupied tight buildings. Since they are unoccupied, I would hope you could turn the energy consuming machines off. The humidity sources within the would be reduced, (breathing, cooking, bathing, et.). Although you would still have ambient humidity and standing water of toilets. Perhaps it would be a good practice to drain the toilets. This issue would be more significant in the Summer of high ambient humidity. I live in the mixed climate of Virginia. However, I would be interested in comments as it relates to other climates. My question applies to tight buildings that have active dehumidification (ac or dehumidifier) and ERV, or no active dehumidification and HRV. Eli </div>
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