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<div class="moz-cite-prefix">Thanks for your feedback Ian, nice to
get your perspective. Fortunately in this to case there is no
push for a vapor barrier from the architect - a battle I've had to
fight many times. We follow a very similar protocol to yours
involving lime wash, and are explicit in describing the function
to clients as not only a sacrificial layer to protect erosion of
the plaster, but a 'sealant' of sorts that reduces moisture
absorption into the plaster while maintaining high vapor
permeability.<br>
<br>
This structure is a multi-occupant commercial building
(cabin/lodge) at an institution, and a low-maintenance finish is a
strong priority. This, coupled with the architect's unfamiliarity
and general discomfort with the principles of plastered wall
assemblies (not aesthetic, but plaster coupled to the interior of
the assembly), directed the project towards cladding. Ah well...<br>
<br>
On a related note, I have a good friend in colleague in Halifax
(Kim, maybe you know her, Annie Murphy?) who has told me that
they have all but entirely moved towards wood cladding over their
SB buildings because the climatic pressures are too much for
plaster when 'deferred maintenance' is a reality, it's interesting
to hear how different regions approach the finishing of the same
wall assembly - I appreciate that there are climate-responsive
vernacular traditions emerging.<br>
<br>
Cheers,<br>
Jacob<br>
<pre class="moz-signature" cols="72">Jacob Deva Racusin
New Frameworks Natural Building, LLC
P.O. Box 15, Montgomery, VT 05470
(802) 782-7783 (c)
(802) 326-2209 (h)
<a class="moz-txt-link-abbreviated" href="http://www.newframeworks.com">www.newframeworks.com</a>
<a class="moz-txt-link-abbreviated" href="mailto:jacob@newframeworks.com">jacob@newframeworks.com</a></pre>
On 4/28/2013 6:01 PM, Ian Redfern wrote:<br>
</div>
<blockquote cite="mid:CDA3EFB9.B5B9%25ian@adobesouth.co.nz"
type="cite">
<div>
<div>
<div>Good morning Jacob,</div>
<div><br>
</div>
<div>Thanks for the invitation to comment from this outreach
of the straw bale building network.</div>
<div> Here in northern New Zealand with a climate not too
unlike the lower new England states and certainly similar to
Oregon and coastal Washington State where we have sub
cyclonic conditions with continuous high humidity (80 –
100%).</div>
<div><br>
</div>
<div> Over more than 15 years of designing natural (adobe
and straw bale) houses and observing the lime plaster putty
based plasters, renders and white washes on them – the lime
putty based products have stood up fantastically to wind
driven rain and shedding internal humidity on straw bale and
earthen walling !</div>
<div><br>
</div>
<div> Lime putty based white wash (simple lime putty and
water AND not thick creamy stuff) is fantastic at healing
any micro cracking that may occur during the seasonal
changes – we specify an initial five coat on the green
render coat then annually (I have just redone [render in
parts and three coats of whitewash] on the exposed sections
of our adobe cottage after 6 or 7 years)</div>
<div><br>
</div>
<div> As said in an earlier thread the rogue element is in
installing any form of vapor barrier in the wall matrix –
the vapor needs to be pulled to the outside and lifted off
by the infinite atmosphere (we express this as the drying
effect of air movement around the building (outside air
movement reduces the water vapor [and other gasses] partial
pressure at the wall surface which is why we purposefully
leave a rough textured surface)</div>
<div><br>
</div>
<div> I trust this is not too detailed – it is better
expanded on by Straube and Burnett in their book "Building
Science for Building Enclosures"</div>
<div><br>
</div>
<div>Cheers</div>
<div><br>
</div>
<div>Ian</div>
<div><br>
</div>
<div> The timber framed houses we have designed and built
use a polyester insulation between the framing with a vapor
permeable building wrap then cavity battens (20mm = 3/4")
behind the lime plaster that is reinforced with a
polypropylene expanded mesh, then the 5 coats of whitewash
= reassurance to client, building regulator, and contractor</div>
<div>And still doing well after many years of coastal
battering (this home has generous eaves on the second story
but the lower level receives full force of wind driven
rain) </div>
<div><br>
</div>
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<p class="MsoNormal"><span
style="font-size:8.0pt;color:#595959;mso-themecolor:
text1;mso-themetint:166">Ian Redfern<br>
<b style="mso-bidi-font-weight:normal">Adobe
South</b><br>
<b style="mso-bidi-font-weight:normal">A:</b><span
style="mso-spacerun:yes"> 5</span> Lancewood
Rise, Onerahi, Whangarei<br>
<b style="mso-bidi-font-weight:normal">P:</b><span
style="mso-spacerun:yes"> </span>09
436 4040<span style="mso-spacerun:yes">
</span><b
style="mso-bidi-font-weight:normal">M:</b>
027 490 2324<br>
<b style="mso-bidi-font-weight:normal">E:</b><span
style="mso-spacerun:yes"> </span><a class="moz-txt-link-abbreviated" href="mailto:ian@adobesouth.co.nz">ian@adobesouth.co.nz</a><o:p></o:p></span></p>
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<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> Jacob Racusin <<a
moz-do-not-send="true"
href="mailto:buildnatural@googlemail.com">buildnatural@googlemail.com</a>><br>
<span style="font-weight:bold">Reply-To: </span> Global Straw
Building Network <<a moz-do-not-send="true"
href="mailto:GSBN@sustainablesources.com">GSBN@sustainablesources.com</a>><br>
<span style="font-weight:bold">Date: </span> Sat, 27 Apr 2013
10:22:50 -0400<br>
<span style="font-weight:bold">To: </span> Derek Stearns Roff
<<a moz-do-not-send="true" href="mailto:derek@unm.edu">derek@unm.edu</a>>,
"<<a moz-do-not-send="true"
href="mailto:nbne@lists.riseup.net">nbne@lists.riseup.net</a>>"
<<a moz-do-not-send="true"
href="mailto:nbne@lists.riseup.net">nbne@lists.riseup.net</a>><br>
<span style="font-weight:bold">Cc: </span> "<<a
moz-do-not-send="true"
href="mailto:gsbn@sustainablesources.com">gsbn@sustainablesources.com</a>>"
<<a moz-do-not-send="true"
href="mailto:gsbn@sustainablesources.com">gsbn@sustainablesources.com</a>><br>
<span style="font-weight:bold">Subject: </span> Re: [GSBN]
[nbne] Earth plaster and Cellulose<br>
</div>
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http-equiv="Content-Type">
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<div>
<div style="font-family:Calibri,sans-serif;font-size:11pt">Great
reference Derek. The inclusion of multiple coats of
limewash does a lot to limit bulk water absorption in
the plaster, reducing the "charge" of the reservoir
cladding.<br>
<br>
Having met with the architect, I learned their chief
concern is not vapor drive, but wind-driven moisture
through inevitable cracks in the plaster bulk-loading
water into the assembly. They cited hurricane exposure
as an extreme design condition, and the issue was less
about the cellulose and more about the location of the
structural framing (as opposed to a bale-wrapped timber
frame). Certainly good arguments for wood cladding, lord
knows the storms are only getting stronger and more
frequent...<br>
<br>
Thanks to those who replied!<br>
<br>
Jacob<br>
<br>
Sent from my Windows Phone<br>
</div>
</div>
<hr><span style="font-size: 10pt; font-weight: bold;
font-family: Tahoma, sans-serif; ">From: </span><span
style="font-size: 10pt; font-family: Tahoma, sans-serif; ">Derek
Stearns Roff</span><br>
<span style="font-size: 10pt; font-weight: bold;
font-family: Tahoma, sans-serif; ">Sent: </span><span
style="font-size: 10pt; font-family: Tahoma, sans-serif; ">4/26/2013
5:55 PM</span><br>
<span style="font-size: 10pt; font-weight: bold;
font-family: Tahoma, sans-serif; ">To: </span><span
style="font-size: 10pt; font-family: Tahoma, sans-serif; "><<a
moz-do-not-send="true"
href="mailto:nbne@lists.riseup.net">nbne@lists.riseup.net</a>>;
Jacob Deva Racusin</span><br>
<span style="font-size: 10pt; font-weight: bold;
font-family: Tahoma, sans-serif; ">Cc: </span><span
style="font-size: 10pt; font-family: Tahoma, sans-serif; "><<a
moz-do-not-send="true"
href="mailto:gsbn@sustainablesources.com">gsbn@sustainablesources.com</a>></span><br>
<span style="font-size: 10pt; font-weight: bold;
font-family: Tahoma, sans-serif; ">Subject: </span><span
style="font-size: 10pt; font-family: Tahoma, sans-serif; ">Re:
[nbne] Earth plaster and Cellulose</span><br>
<br>
</div>
</div>
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