[Strawbale] Airtight plaster

[Sebastien Hubert]

Hello Wouter,

I would be interrested to receive your pictures...

A bale without plaster has no airtightness at all...  that is very very 
bad...

Cheers

Seb

On 21/06/2012 23:23, Wouter Klijn wrote:
>
> Sebastien,
>
> Thanks for your document about air-tightness.  It has a lot of 
> interesting details.
>
>
> As for most of the construction types, air tightness is very good 
> possible if you give the details the appropriate countermeasures.  So 
> it is also for straw bale  constructions.  But to my experience it is 
> not a quality that should be expected without attention.  If you just 
> build a straw bale construction, you have a high possibility for a bad 
> air tightness.  I have made some thermo graphic pictures of  
> (loadbearing and infill)  strawbale walls with an indication of bad 
> air tightness.   If anyone is interested in these pictures, I can send 
> them if you mail me at wouter at strobouw.nl
>
> Does anyone know what the average air tightness is of a bale without 
> plaster ?
>
> Warm regards from Holland
>
>
>
>
>
>>
>> Message: 2
>> Date: Sun, 17 Jun 2012 23:46:07 +0200
>> From: Sebastien Hubert <sebastien.hubert at mc2000.be>
>> To: strawbale at amper.ped.muni.cz
>> Subject: Re: [Strawbale] airtight plaster
>> Message-ID: <4FDE501F.408 at mc2000.be>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Dear all,
>>
>> I updated the english file and also add a french version.
>>
>> http://www.mc2000.be/docs/air_tightness_straw_bale_house.pdf
>> http://www.mc2000.be/docs/Maison_en_paille-etancheite_a_l_air.pdf
>>
>> I'll try to translate it in dutch as well...
>>
>> Cheers
>>
>> Seb
>>
>> 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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>>>>>
>>
>>
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>> End of Strawbale Digest, Vol 79, Issue 4
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>
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