<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Lamba 0.099 converts to R1.45 per inch<br><br><div id="1329852532938-sig-id">Sent from my BlackBerry® PlayBook™<br>www.blackberry.com</div><br><hr><div><strong>From:</strong> "asbn" <asbn@baubiologie.at><br><strong>To:</strong> "Global Straw Building Network" <GSBN@sustainablesources.com><br><strong>Sent:</strong> 22 April, 2013 5:14 AM<br><strong>Subject:</strong> Re: [GSBN] Fwd: [nbne] R-value of compressed straw panels<br></div><br>Dear Tristan et al<div><br></div><div>When we use strawboards in Europe (as separation walls), we mainly use Ecopanely from Czech Republic.</div><div>This product is CE certified (European Technical Approval).</div><div>The website is in english, too: <a href="http://www.ekopanely.cz/en/">http://www.ekopanely.cz/en/</a><br><div><br></div><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><b><font class="Apple-style-span" size="3">Values of heat insulation magnitude</font></b></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">heat transfer coefficient:</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">λ = 0,099 Wm-1 K-1, R = 0,5858 m2 KW-1</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">diffusion resistance: RD = 4,6 * 109 ms-1</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">diffusion resistance coefficient: μ = 9,7</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">heat penetration coefficient:</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">U = 1,04 – 1,39 W/m2 * K</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">according to the construction layout,</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 6.5px/normal Helvetica; color: rgb(26, 24, 23); "><font class="Apple-style-span" size="3">season, and heat flux</font></div><div><br><div apple-content-edited="true"> <div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>There is another board called iStraw with the same values:</div><div><a href="http://www.istraw.de/">http://www.istraw.de/</a> site only in german</div><div><br></div><div>all the best</div><div>Herbert</div><div>-----------------</div><div>asbn - austrian strawbale network</div><div>3720 Ravelsbach, Baierdorf 6</div><div>Tel. 02958-83640</div><div><a href="mailto:asbn@baubiologie.at">asbn@baubiologie.at</a></div><div><a href="http://www.baubiologie.at">www.baubiologie.at</a></div></div><div><br></div></div><br class="Apple-interchange-newline"> </div><br><div><div>Am 22.04.2013 um 04:12 schrieb <a href="mailto:ejgeorge@riseup.net">ejgeorge@riseup.net</a>:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hey again all. This question came up on the NBNE list from Tristan Roberts of BuildingGreen. Robert Riversong's response is included below Tristan's post, but I thought someone over here might also have more information on the purported Stramit lab test.<br><br>----- Forwarded message from <a href="mailto:tristan@buildinggreen.com">tristan@buildinggreen.com</a> -----<br><br><br>Hi,<br><br>Does anyone have insight into the R-value of compressed straw panels such as Stramit (currently produced in Texas) or Agriboard (no longer being produced)?<br><br>Stramit USA claims R-3.03/inch, and I have even seen press releases claiming R-3.35. However, the company can't produce a lab test to prove this to me, and there is history of R-value inflation in compressed straw, as this old EBN article talks about:<br><br><a href="http://www.buildinggreen.com/auth/article.cfm/1998/1/1/Agriboard-s-Inflated-R-value-Claims/">http://www.buildinggreen.com/auth/article.cfm/1998/1/1/Agriboard-s-Inflated-R-value-Claims/</a><br><br>I supposed there might be less convective loops in a compressed straw panel compared with a bale, but intuitively it's hard for me to picture how compressed straw has higher R-value.<br><br>It's probably a longshot, but I wondered if anyone has any insight (or maybe you know someone who might). Also, if you have any recent experience with Stramit, I'd like to talk with you.<br><br>thanks!<br><br>Tristan<br><br><br>____________<br>Tristan Roberts<br>Editorial Director<br>BuildingGreen, Inc.<br>http://www.BuildingGreen.com<br>http://www.LEEDuser.com<br><br>(802) 257-7300 x121<br>tristan@buildinggreen.com<br><br>-----------end forwarded message -----------<br><br>Robert's reply:<br><br>Loose fibrous materials often increase in R-value per inch with increased density - up to a point of diminishing returns - and I have no reason to doubt that compressed straw would be more insulative than straw bales.<br><br>Loose-fill fiberglass, for instance, is about R-2.5/inch, while fiberglass batts, which used to be about R-3.14/inch for standard R-11 batts, were increased to R-13 (3.7/inch) in "high-density batts", and semi-rigid fiberglass board as well as dense-pack Spider is about R-4/inch.<br><br>Similarly, loose fill cellulose is about R-3.4/inch at 1.4 pcf density, while dense-pack cellulose at 3+ pcf can be as much as R-3.8/inch.<br><br>But the density range that Stramit specs of 15.6-40.5 pcf puts it at about the same density range as solid wood, which is about R-1.25/inch. So I also question their claim of R-3.35/inch.<br><br><br><br>_______________________________________________<br>GSBN mailing list<br>GSBN@sustainablesources.com<br>http://sustainablesources.com/mailman/listinfo.cgi/GSBN<br><br></div></blockquote></div><br></div></div></div></body></html>