<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">I second Anni’s points and add that the shrinking and swelling of the OSB is likely to telegraph to the surface of the veneer plaster. <div><br></div><div>Bob Theis<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Aug 19, 2024, at 3:18 PM, Anni Tilt <anni@arkintilt.com> wrote:</div><br class="Apple-interchange-newline"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>Hi there</div><div><br></div>In general we don’t use OSB adjacent to straw bale walls as they are not very breathable (note that we have used plywood, which has a higher perm rating, on the interior of a hybrid bale-insulated frame wall). Additionally, OSB tends to off-gas - not good in an interior environment. <div>I don’t know about the specific coating being proposed on the interior, but a clay paint might be easy and low cost (although perhaps not as durable). </div><div><br></div><div>Or might I suggest having a workshop to have plasterers join from around the world - plastering destination vacations! I might even consider signing up! </div><div><br></div><div>best</div><div>Anni Tilt</div><div><div>
<meta charset="UTF-8"><div dir="auto" style="font-family: Skia; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="caret-color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><font class="Apple-style-span" color="#D8792A" style="orphans: 2; widows: 2; font-size: 10px;"><font class="Apple-style-span" face="Copperplate" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br class="Apple-interchange-newline">Arkin Tilt Architects<font class="Apple-style-span" face="Copperplate-Light"><span class="Apple-style-span" style="white-space: pre;"> </span></font></span></font></font><font class="Apple-style-span" color="#D8792A" size="1" style="orphans: 2; widows: 2;"><span class="Apple-style-span" style="font-size: 9px;">E</span></font><font class="Apple-style-span" color="#D8792A" size="1" style="orphans: 2; widows: 2;"><span class="Apple-style-span" style="font-size: 9px;">cological Planning & Design</span></font></div></div></div><div style="caret-color: rgb(0, 0, 0); font-family: Skia; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; orphans: 2; widows: 2; font-size: 10px;"><div><span class="Apple-tab-span" style="white-space: pre;"><span class="Apple-style-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space: pre;"> </span></span><font class="Apple-style-span" color="#D8792A" size="1"><span class="Apple-style-span" style="font-size: 9px;">1101 8th Street, #180</span></font></div><div><span class="Apple-tab-span" style="white-space: pre;"><span class="Apple-style-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space: pre;"> </span></span><font class="Apple-style-span" color="#D8792A" size="1"><span class="Apple-style-span" style="font-size: 9px;">Berkeley, CA 94710</span></font></div><div><span class="Apple-tab-span" style="white-space: pre;"><span class="Apple-style-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space: pre;"> </span></span><font class="Apple-style-span" color="#D8792A" size="1"><span class="Apple-style-span" style="font-size: 9px;">510.528.9830</span></font></div><div><span class="Apple-tab-span" style="white-space: pre;"><span class="Apple-style-span" style="white-space: pre;"> <span class="Apple-tab-span"> </span></span></span><font class="Apple-style-span" color="#D8792A" size="1"><span class="Apple-style-span" style="font-size: 9px;">510.418.9788 mobile</span></font></div><div><span class="Apple-tab-span" style="white-space: pre;"><span class="Apple-style-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space: pre;"> </span></span><font class="Apple-style-span" color="#D8792A" size="1"><span class="Apple-style-span" style="font-size: 9px;"><a href="http://www.arkintilt.com/">www.arkintilt.com</a></span></font></div></div>
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<div><br><blockquote type="cite"><div>On Aug 19, 2024, at 2:10 PM, Van Krieken <vankrieken@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><div dir="auto">Hi<div dir="auto"><br></div><div dir="auto">In the picture you see the prefab strawbale walls she is covering with OSB.</div><div dir="auto">I allways recomend to cover those walls wuth clay, but in this case the owner decided to use OSB.</div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">A segunda, 19/08/2024, 20:57, Dave Howorth <<a href="mailto:dave@howorth.org.uk">dave@howorth.org.uk</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, 19 Aug 2024 16:03:14 +0100<br>
Van Krieken <<a href="mailto:vankrieken@gmail.com" target="_blank" rel="noreferrer">vankrieken@gmail.com</a>> wrote:<br>
<br>
> Hello everyone,<br>
> I have a friend who is building a house with prefabricated straw bale<br>
> walls, but she is having a lot of trouble finding available labor for<br>
> the clay plastering. So, instead of plastering the interior walls<br>
> with clay, she decided to cover them with 12mm OSB boards and then<br>
> apply a thin plaster made of marble dust, clay, and lime.<br>
> <br>
> I visited the house on a very hot day and was surprised by how cool<br>
> the walls were, which means the thermal inertia is working well.<br>
> <br>
> On the exterior, she covered the straw bale walls with wood fiber<br>
> insulation boards, plastered them with 10mm of NHL, and then applied<br>
> sprayed cork, which means the wall 'breathes' well through that layer.<br>
> <br>
> What is your opinion on placing OSB on the interior side of the<br>
> exterior walls?<br>
<br>
I'm a little confused by your question. What is on the inside of the<br>
prefabricated straw bale walls as installed? And what is shown in the<br>
pictures?<br>
<br>
> Jorge Van Krieken<br>
> <br>
> Green Heritage - Portugal<br>
<br>
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