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<DIV>To try and answer your question Carina, it looks like they use the word
“render” to mean interior undercoat, before a top or finish coat of plaster is
applied. In this case, an undercoat of plaster was not applied first, which is
why the total thickness of applied plaster was quite thin. As I said in my first
post , sometimes an interior undercoat is called a “render”, possibly because
quite often the undercoat would be cement/lime based, like an exterior render,
and then finished with a gypsum plaster top coat.</DIV>
<DIV
style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt"> </DIV>
<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">Paul<BR>
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<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=carina.simons@gmx...
href="mailto:carina.simons@gmx...">Carina Simons</A> </DIV>
<DIV><B>Sent:</B> Thursday, April 21, 2011 6:29 PM</DIV>
<DIV><B>To:</B> <A title=strawbale@amper....muni.cz
href="mailto:strawbale@amper....muni.cz">'European strawbale building
discussions'</A> </DIV>
<DIV><B>Subject:</B> Re: [Strawbale] Air tightness and earth
plastering</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
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<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB>Hallo,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt" lang=EN-GB>If render
and plaster is he same, than what is meant with the problem of the air tightness
in the passive house. There was said that the air tightness was not so good
because of the failing render but then earth plaster was on
it!<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB>Greetings,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB>Carina<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB><o:p></o:p></SPAN></FONT> </P>
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</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Von:</SPAN></FONT></B><FONT
size=2 face=Tahoma><SPAN style="FONT-FAMILY: tahoma; FONT-SIZE: 10pt">
strawbale-bounces@amper....muni.cz [mailto:strawbale-bounces@amper....muni.cz]
<B><SPAN style="FONT-WEIGHT: bold">Im Auftrag von </SPAN></B>Andrew
Morrison<BR><B><SPAN style="FONT-WEIGHT: bold">Gesendet:</SPAN></B> Donnerstag,
21. April 2011 17:46<BR><B><SPAN style="FONT-WEIGHT: bold">An:</SPAN></B>
<st1:personname w:st="on">European strawbale building
discussions</st1:personname><BR><B><SPAN
style="FONT-WEIGHT: bold">Betreff:</SPAN></B> Re: [Strawbale] Air tightness and
earth plastering</SPAN></FONT><o:p></o:p></P></DIV>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></FONT> </P>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><FONT size=3
face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">As far as I know, they are
the same. Here in the United States we say plaster. When I was in Australia
teaching last month, they spoke of render. I don't know of a
difference.<BR><BR>Andrew<o:p></o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt">2011/4/21 Carina Simons <<A
href="mailto:carina.simons@gmx...">carina.simons@gmx...</A>><o:p></o:p></SPAN></FONT></P>
<DIV vlink="purple" link="blue" bgcolor="white">
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt">Hallo to
everybody,</SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"> </SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt" lang=EN-GB>Since I am
not a native English speaker I do not know the differents between a render and a
plaster. Can anyone explain that to me?</SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB> </SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt" lang=EN-GB>Many
greetings,</SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB> </SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB>Carina</SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: arial; COLOR: navy; FONT-SIZE: 10pt"
lang=EN-GB> </SPAN></FONT><o:p></o:p></P>
<DIV>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center><FONT size=3
face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">
<HR align=center SIZE=2 width="100%">
</SPAN></FONT></DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><B><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Von:</SPAN></FONT></B><FONT
size=2 face=Tahoma><SPAN style="FONT-FAMILY: tahoma; FONT-SIZE: 10pt"> <A
href="mailto:strawbale-bounces@amper....muni.cz"
target=_blank>strawbale-bounces@amper....muni.cz</A> [mailto:<A
href="mailto:strawbale-bounces@amper....muni.cz"
target=_blank>strawbale-bounces@amper....muni.cz</A>] <B><SPAN
style="FONT-WEIGHT: bold">Im Auftrag von </SPAN></B>Sebastien Hubert<BR><B><SPAN
style="FONT-WEIGHT: bold">Gesendet:</SPAN></B> Mittwoch, 20. April 2011
22:53<BR><B><SPAN style="FONT-WEIGHT: bold">An:</SPAN></B> <A
href="mailto:strawbale@amper....muni.cz"
target=_blank>strawbale@amper....muni.cz</A><BR><B><SPAN
style="FONT-WEIGHT: bold">Betreff:</SPAN></B> [Strawbale] Air tightness and
earth plastering</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=black size=3 face="Times New Roman"><SPAN
style="COLOR: black; FONT-SIZE: 12pt"> </SPAN></FONT><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><FONT color=black size=3 face="Times New Roman"><SPAN
style="COLOR: black; FONT-SIZE: 12pt">Hello everybody,<BR><BR>Till yesterday I
was pretty confident that it was possible to make a good air tightness using
earth plastering. Yesterday an other professional called me
regarding air tightness. His neighbor and him did a blowerdoor test to
verify the airtightness of their 2 passive houses (should be passive). The
result was not good. The n<SUB>50</SUB> leakage rate is supposed to be
smaller than 0.6. The building must not leak more air than 0.6 times the house
volume per hour (n<SUB>50</SUB> ≤ 0.6 / hour) at 50Pa (N/m²) as tested by a
blower door.<BR><BR>He obtained n<SUB>50</SUB> = 1.2 and it was 0.95 for the
second one. They worked 2 days trying to find what could be the problem
and didn't find any major leakage. There was 1 point that could be a
problem. A basement wall that is part of the living space get only 1 layer
of earth plastering but no render. The thickness is more or less
1.5cm. They decided to glue a airtightness sheet (1 square meter) on this
wall. They blew the air outside of the building. Then they saw the
sheet (that has been glued) inflating meaning that the earth plastering was not
airtight. <BR><BR>Of course, I have to say that it would be better to put
the render on this wall. Airtightness should be probably better.
<BR><BR>I'm building a straw bale (this is our house) and we really want a good
airtightness. For the wall, the earth plastering is supposed to do the
airtightness. We are going to make a blower door test before finishing the
details. This means the renders are not ready yet because we will put the
last earth layer on the wall and ceiling at the same moment. This will be
done after the blowerdoor test. This means that the blower door test will
perhaps not be successful.<BR><BR>What do you think about it ?<BR><BR>Does
anybody already make a blowerdoor test with earth plastering airtightness
?<BR><BR>I would really appreciate a feedback.<BR><BR>Many
thanks<BR><BR>Cheers<BR><BR>Sebastien</SPAN></FONT><o:p></o:p></P></DIV></DIV></DIV></DIV>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><FONT size=3
face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt"><BR>____________________________________________________<BR>
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<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><FONT size=3
face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"><BR><BR clear=all><BR>--
<BR>Andrew Morrison<BR>Consultant, Teacher, Inspiring
Change<o:p></o:p></SPAN></FONT></P>
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