[Strawbale] humidity and sauna

Sat Apr 11 11:57:53 CEST 2009

Rikki Nitzkin a écrit :
> I know that some people have made SB Saunas, so I suppose that the  
> solutions that work for that would work for this...
In fact sauna's have very LOW humidity. That is why they can be so hot. Yes, some water is poured on the hot stones, but the relative humidity still is very low (if not, you'd be boilded).  The water molecule increases the heat transfer. Try sticking one hand in water of 40°C (104F) while holding the other hand up in the air of 40°C on a hot summers day. You'll get the point. 

OK Mark, the UK gets more than its fair share of rain, but it also gets 
the wind to dry it all up again.

Personally (to play safe) I would not use bales in a situation of 
constant very high humidity. Or I would do a smalscale test building 
(with multiple moisture sensors in the walls)

All the best,

Andre de Bouter
La Maison en Paille
France

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> El 10/04/2009, a las 12:00, strawbale-request at amper....muni.cz  
> escribió:
>
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>>   1.  Mushroom building (Mark Harrison)
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>> Message: 1
>> Date: Thu, 9 Apr 2009 21:27:38 +0100
>> From: "Mark Harrison" <mark at harrisonembrey...>
>> Subject: [Strawbale] Mushroom building
>> To: "European strawbale building discussions"
>> 	<strawbale at amper....muni.cz>
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>> Hi Rikki,
>>
>> Here in the UK we of course havea high humidity pretty well year  
>> round and we have successfully built commercial straw bale buildings  
>> using walls that are lime plastered and quite capable of looking  
>> after themselves. I also have first hand experience of building a  
>> livestock house (for pigs). The non-structural bales were recorded  
>> at 16% moisture when they went in and were kept dry, lime plastered  
>> on the outside but left natural on the inside with a close pattern  
>> wire mesh to protect the surface from being eaten! Fungi did grow on  
>> the exposed surface of these internal walls but we controlled them  
>> by using an off the shelf mold inhibitor which still allowed the  
>> walls to breathe. The buildings were taken down after 5 years of  
>> pretty continous use. I have spoken to my colleague David Thorne and  
>> he is adamant that the bales were as good as the day they went in  
>> though he didn't test the moisture content.
>>
>> My view is that the excellent thermal insulation of straw bale walls  
>> is a perfect opportunity for your application as you can get a very  
>> stable internal environment especially if you exploit straw in the  
>> roof. The techniques to allow zero thermal bridging, managed  
>> ventilation and a breathable envelope are key along with the  
>> ensuring the right bulk density, moisture content and low embodied  
>> microbial levels of your straw.
>>
>> Good luck!
>>
>> Mark
>>  ----- Original Message -----
>>  From: Rikki Nitzkin
>>  To: GSBN ; "ESBN"
>>  Sent: Monday, April 06, 2009 7:26 PM
>>  Subject: [Strawbale] Fwd: Humidity within a bale house....
>>
>>
>>
>>
>>
>>
>>    I have recently gotten an email from a man who wants to build a  
>> SB mushroom farm. He would like to know if it is a problem that the  
>> INTERIOR of the building has a humidity level of 75-90%.
>>
>>
>>    I usually prefer to use breathable earth plasters (or lime), but  
>> I am wondering if this would be a good case to apply a WATERPROOF  
>> (cement? latex paint?) plaster to the interior of the building to  
>> avoid excess humidity in the walls.
>>
>>
>>    Any thoughts/suggestions?
>>
>>
>>    Rikki Jennifer Nitzkin
>>    Coordinadora de la Red de Construcci?n con Balas de Paja
>>
>>
>>    www.casasdepaja.org
>>    casasdepaja at yahoo...
>>    http://casasdepaja.blogspot.com/
>>
>>
>>
>>
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>>
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