[Strawbale] airtight plaster

Sebastien Hubert sebastien.hubert at mc2000.be
Sun Jun 17 23:46:07 CEST 2012

Dear all,

I updated the english file and also add a french version.


I'll try to translate it in dutch as well...



On 15/06/2012 22:41, Sebastien Hubert wrote:
> Hello all,
> Please find below my answer to Dave.  But the file is too big.
> You can download it on :
> http://www.mc2000.be/docs/air_tightness_straw_bale_house.pdf
> Cheers
> Seb
> On 15/06/2012 22:32, Sebastien Hubert wrote:
>> Hello Dave,
>> There is no problem to use plaster as the main barrier.
>> I've put a document describing airtightness of a straw bale house.
>> We did a blowerdoor test before finishing the last plaster layer.  
>> Although the last layer was not done yet, the result of the test was 
>> very good.
>> The result we get is quite encouraging as we reach the value of 0.93 
>> (each hour 0.93 air volume of the house is renewed under a pressure 
>> of 50Pa.  For a passive house the value should be 0.6 max.  Altough 
>> we will not be passive we are quite close to it.  A new test will be 
>> done later as the finish coat is done now.
>> I hope the file is not too big for the list...  If it's too big, I'll 
>> put it on a web site....
>> I hope this will help you ...
>> Cheers
>> Seb
>> On 09/06/2012 15:56, Dave Howorth wrote:
>>> I'm planning to build a loadbearing bale house next year. I'm currently
>>> thinking about airtightness (I'm of the 'build tight, ventilate right'
>>> school of thought). It doesn't seem to be an easy subject to read up
>>> about, so I'd welcome any advice or pointers to materials about making
>>> straw bale walls airtight.
>>> I'm planning to use the indoor plaster as the main airtight barrier. It
>>> will probably be clay plaster, though lime is a possible alternative. I
>>> know a bit about tapes to use at window and ceiling junctions and so
>>> forth. My main concern at the moment is about how to use clay 
>>> plaster to
>>> make an airtight barrier that stays airtight. So things like minimising
>>> cracking and so on.
>>> I'd be grateful for [links to] any information about practical
>>> techniques and recipes, and information about any airtightness tests.
>>> Thanks, Dave
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