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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thank you Dave and Paul!<o:p></o:p></span></font></p>
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<p style='margin-bottom:12.0pt'><font size=2 color=navy face="Times New Roman"><span
style='font-size:10.0pt;color:navy'><br>
Sven Aluste, <br>
NGO Equilibre <a href="http://www.equilibre.ee/">www.equilibre.ee</a> <o:p></o:p></span></font></p>
<p style='margin-bottom:12.0pt'><font size=2 color=navy face="Times New Roman"><span
style='font-size:10.0pt;color:navy'>Estonia<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> strawbale-bounces@amper....muni.cz
[mailto:strawbale-bounces@amper....muni.cz] <b><span style='font-weight:bold'>On
Behalf Of </span></b>paul paul<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, April 13, 2011
12:51 AM<br>
<b><span style='font-weight:bold'>To:</span></b> European Strawbale List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Strawbale] moisture</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>From <br>
<br>
Moisture Properties of Plaster and Stucco (render) for<br>
Strawbale Buildings<br>
John Straube<br>
<br>
download here:<br>
http://members.westnet.com.au/ejt/pdf/Straube_Moisture_Tests.pdf<br>
<br>
"6 Conclusions<br>
Based on the test data and literature review, several conclusions can be drawn:<br>
1. A <st1:metricconverter ProductID="450 mm" w:st="on">450 mm</st1:metricconverter>
(<st1:metricconverter ProductID="18”" w:st="on">18”</st1:metricconverter>)
thick strawbale should have a vapor permeance of<br>
approximately 110 to 220 ng/ Pa•s•m2 (2 to 4 US perms).<br>
2. Cement:sand stuccos are relatively vapour impermeable. In fact a 38 mm<br>
(<st1:metricconverter ProductID="1.5”" w:st="on">1.5”</st1:metricconverter>)
thick cement : sand stucco may act as a vapor barrier (i.e., have a<br>
permeance of less than 1 US Perm).<br>
3. The addition of lime to a cement stucco mix increases permeance. As the<br>
proportion of lime is increased, the permeance increases. Pure lime:sand<br>
stuccos are very vapor permeable. The permeance of a <st1:metricconverter
ProductID="38 mm" w:st="on">38 mm</st1:metricconverter> (<st1:metricconverter
ProductID="1.5”" w:st="on">1.5”</st1:metricconverter>) thick<br>
cement : sand stucco can be increased to 5 or 10 US Perms by replacing half<br>
the cement with lime and to 15 to 30 US Perms by using a pure lime : sand<br>
stucco. The addition of even a small amount of lime (0.2 parts) may<br>
increase the permeance of cement stucco dramatically (e.g.,from under 1 to<br>
3 to 6 US Perms).<br>
4. Earth plasters are generally more permeable than even lime plasters. The<br>
addition of straw increases the permeability further. A <st1:metricconverter
ProductID="38 mm" w:st="on">38 mm</st1:metricconverter> (<st1:metricconverter
ProductID="1.5”" w:st="on">1.5”</st1:metricconverter>) thick<br>
earth plaster can have a permeance of over 1200 metric perms (over 20 US<br>
Perms), in the same order as building papers and housewraps.<br>
5. Applying an oil paint to a moderately permeable 1:1:6 stucco will provide a<br>
permeance of less than 60 metric perms (1 US perms) and thus meet the<br>
code requirements of a vapour barrier.<br>
6. Earth plasters were not found to have significantly different water<br>
absorption than cement and lime stuccos. The earth plasters, regardless of<br>
density and straw content, resisted 24 hour of constant wetting easily,<br>
although the topmost 1/8” of surface became quite “muddy”. In a real<br>
rainstorm this behavior may cause erosion.<br>
7. Lime washes appear to be somewhat useful for reducing water absorption<br>
while not reducing vapor permeance. The lime wash over earth plaster did<br>
not dramatically lower water absorption but will increase the mechanical<br>
strength of the plaster after wetting, i.e., they will increase the resistance
to<br>
rain erosion.<br>
8. Based on Minke’s and Straube’s earlier tests, siloxane appears to have
little<br>
or no effect on the vapor permeance of cement, cement:lime, lime, and<br>
Moisture Properties of Plaster and Stucco for Strawbale Buildings EBNet<br>
BalancedSolutions.com 34<br>
earth plasters while almost eliminating water absorption. The use of<br>
siloxane can be recommended based on these earlier tests.<br>
9. Sodium silicate did not seem to have much impact on water uptake or vapor<br>
permeance. This additive may hold earth plaster together, or increase its<br>
erosion resistance, but as tested it had no noticeable impact on moisture<br>
properties.<br>
10. Linseed oil at 2% in an earth plaster mix is not a very effective water<br>
repellent and does act to restrict vapor permeance somewhat. It may add<br>
some strength to an earth plaster in the wet state. Heavy applications of<br>
linseed oil to the surface of finished earth plaster will, based on Minke’s<br>
tests, reduce the water absorption to almost zero, but will markedly decrease<br>
vapor permeance.<br>
11. The test methods described here appear to provide repeatable results, and
in<br>
general compare well to previous tests on different samples by both the<br>
same (Straube) and different researchers (Minke)."<br>
<br>
<br>
<o:p></o:p></span></font></p>
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