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<DIV>Sebastien,<BR><BR>Thanks for your document about air-tightness. It has a
lot of interesting <BR>details.<BR><BR><BR>As for most of the construction
types, air tightness is very good possible <BR>if you give the details the
appropriate countermeasures. So it is also for <BR>straw bale constructions. But
to my experience it is not a quality that <BR>should be expected without
attention. If you just build a straw bale <BR>construction, you have a high
possibility for a bad air tightness. I have <BR>made some thermo graphic
pictures of (loadbearing and infill) strawbale <BR>walls with an indication of
bad air tightness. If anyone is interested in <BR>these pictures, I can send
them if you mail me at <A
href="mailto:wouter@strobouw.nl">wouter@strobouw.nl</A><BR><BR>Does anyone know
what the average air tightness is of a bale without plaster ?</DIV>
<DIV><BR><BR>Warm regards from Holland<BR><BR><BR><BR><BR><BR>><BR>>
Message: 2<BR>> Date: Sun, 17 Jun 2012 23:46:07 +0200<BR>> From: Sebastien
Hubert <<A
href="mailto:sebastien.hubert@mc2000.be">sebastien.hubert@mc2000.be</A>><BR>>
To: <A
href="mailto:strawbale@amper.ped.muni.cz">strawbale@amper.ped.muni.cz</A><BR>>
Subject: Re: [Strawbale] airtight plaster<BR>> Message-ID: <<A
href="mailto:4FDE501F.408@mc2000.be">4FDE501F.408@mc2000.be</A>><BR>>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed<BR>><BR>> Dear
all,<BR>><BR>> I updated the english file and also add a french
version.<BR>><BR>> <A
href="http://www.mc2000.be/docs/air_tightness_straw_bale_house.pdf">http://www.mc2000.be/docs/air_tightness_straw_bale_house.pdf</A><BR>>
<A
href="http://www.mc2000.be/docs/Maison_en_paille-etancheite_a_l_air.pdf">http://www.mc2000.be/docs/Maison_en_paille-etancheite_a_l_air.pdf</A><BR>><BR>>
I'll try to translate it in dutch as well...<BR>><BR>>
Cheers<BR>><BR>> Seb<BR>><BR>> On 15/06/2012 22:41, Sebastien Hubert
wrote:<BR>>> Hello all,<BR>>><BR>>> Please find below my
answer to Dave. But the file is too big.<BR>>><BR>>> You can
download it on :<BR>>> <A
href="http://www.mc2000.be/docs/air_tightness_straw_bale_house.pdf">http://www.mc2000.be/docs/air_tightness_straw_bale_house.pdf</A><BR>>><BR>>>
Cheers<BR>>><BR>>> Seb<BR>>><BR>>> On 15/06/2012 22:32,
Sebastien Hubert wrote:<BR>>>> Hello
Dave,<BR>>>><BR>>>> There is no problem to use plaster as the
main barrier.<BR>>>><BR>>>> I've put a document describing
airtightness of a straw bale house.<BR>>>><BR>>>> We did a
blowerdoor test before finishing the last plaster layer.<BR>>>>
Although the last layer was not done yet, the result of the test
was<BR>>>> very good.<BR>>>><BR>>>> The result we get
is quite encouraging as we reach the value of 0.93<BR>>>> (each hour
0.93 air volume of the house is renewed under a pressure<BR>>>> of
50Pa. For a passive house the value should be 0.6 max. Altough<BR>>>>
we will not be passive we are quite close to it. A new test will
be<BR>>>> done later as the finish coat is done
now.<BR>>>><BR>>>> I hope the file is not too big for the
list... If it's too big, I'll<BR>>>> put it on a web
site....<BR>>>><BR>>>> I hope this will help you
...<BR>>>><BR>>>> Cheers<BR>>>><BR>>>>
Seb<BR>>>><BR>>>> On 09/06/2012 15:56, Dave Howorth
wrote:<BR>>>>> I'm planning to build a loadbearing bale house next
year. I'm currently<BR>>>>> thinking about airtightness (I'm of the
'build tight, ventilate right'<BR>>>>> school of thought). It
doesn't seem to be an easy subject to read up<BR>>>>> about, so I'd
welcome any advice or pointers to materials about making<BR>>>>>
straw bale walls airtight.<BR>>>>><BR>>>>> I'm planning
to use the indoor plaster as the main airtight barrier. It<BR>>>>>
will probably be clay plaster, though lime is a possible alternative.
I<BR>>>>> know a bit about tapes to use at window and ceiling
junctions and so<BR>>>>> forth. My main concern at the moment is
about how to use clay<BR>>>>> plaster to<BR>>>>> make an
airtight barrier that stays airtight. So things like
minimising<BR>>>>> cracking and so
on.<BR>>>>><BR>>>>> I'd be grateful for [links to] any
information about practical<BR>>>>> techniques and recipes, and
information about any airtightness
tests.<BR>>>>><BR>>>>> Thanks,
Dave<BR>>>>><BR>>>>>
____________________________________________________<BR>>>>>
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End of Strawbale Digest, Vol 79, Issue 4<BR>>
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