<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><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><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 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>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><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> Jacob Racusin <<a href="mailto:buildnatural@googlemail.com">buildnatural@googlemail.com</a>><br><span style="font-weight:bold">Reply-To: </span> Global Straw Building Network <<a 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 href="mailto:derek@unm.edu">derek@unm.edu</a>>, "<<a href="mailto:nbne@lists.riseup.net">nbne@lists.riseup.net</a>>" <<a href="mailto:nbne@lists.riseup.net">nbne@lists.riseup.net</a>><br><span style="font-weight:bold">Cc: </span> "<<a href="mailto:gsbn@sustainablesources.com">gsbn@sustainablesources.com</a>>" <<a 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><div><br></div><div><meta content="text/html; charset=utf-8" http-equiv="Content-Type"><div><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 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 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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