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Re: GSBN:40% humidity

Hi Andre,

As Jim writes, worldwide expert on passive climate control in buildings such as archives and museums is Tim Padfield. His extensive research is available for free on his remarkable website.

You might be particularly interested in:

<a  target="_blank" href="http://www.padfield.org/tim/cfys/musmic/musmicbuf.pdf";>http://www.padfield.org/tim/cfys/musmic/musmicbuf.pdf</a>

Materials creating all the surfaces (including equipment, furniture ,etc.) in the room seem to play crucial role in passive humidity (relative humdity) control as well as maintaining constant temperature. One might assume that straw bale building could be ideal for this purpose, because it won't need much energy for maintaining constant temperature in temperate climate of France and on top of it, according to Padfields research, earth plaster seems to create excellent surface for humidity buffering:

<a  target="_blank" href="http://www.padfield.org/tim/cfys/wallbuff/wallbuff.php";>http://www.padfield.org/tim/cfys/wallbuff/wallbuff.php</a>

Plastered straw bale walls, according to Padfields e-mail, has enormous water vapour capacity:

<a  target="_blank" href="http://www.jakubwihan.com/pdf/thesis.pdf";>http://www.jakubwihan.com/pdf/thesis.pdf</a> , pg. 267

Personaly, I think that winery monitoring done by Straube and Schummacher won't help you much in this case, because the room designed for maintaining constant relative humidity of 80% was air conditioned. I would be very interested, if anyone out there did a monitoring that would more directly shed some light on the subject of using straw bale walls for passive maintainance of constant relative humidity. The monitoring that I'm familiar with (monitoring widely available for free on internet) suggests that palstered straw bales seem to make a very promising solution in case of various archives and museum buildings.



----- Original Message ----- From: "Andr&eacute; de Bouter" forum@... To: "GSBN" GSBN@...; "ACHTE Christophe" achte_christophe@...
Sent: Tuesday, November 06, 2007 7:56 AM
Subject: GSBN:40% humidity

Hello everyone,

Christophe Achte (that same army engineer student I mentioned earlier)
told me of a project of the French army were electronical material will
be stalled (for future use) in buildings that should keep the humidity
at a constant 40% to avoid corrosion of the material. He wondered if SB
with earthen plasters could be used instead of airtight 'modern'
materials. The need to keep the straw under 20% makes me hesitate to
give an answer. But someone who participated in the discussion told us
that 70% humidity in wine cellars is quite common.
Do we have any info, from the Ridge Winery for instance, that might shed
light on this subject?

Andr&eacute; -hic- de Bouter
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