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GSBN: Digest for 1/17/05



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-> Leaving bales bare
     by Rene Dalmeijer rene.dalmeijer@...
-> RE: GSBN:Leaving bales bare
     by "John Straube" jfstraube@...


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Date: 17 Jan 2005 08:36:43 -0600
From: Rene Dalmeijer rene.dalmeijer@...
Subject: Leaving bales bare

Fellow SBers,

A topic I have been pondering recently concerns the logic of rapidly
applying plaster to bale walls. I plead for doing so.   Based on the
following logic:

Fresh dry bales are basically relatively spore free. If these bales are
rapidly encased in plaster there is very little chance that the straw
will be infected with new fungus spores. Therefore seriously improving
the chances of a long life span of the SB wall even in the event of a
one time wetting.

In the past I have heard about and seen SB houses that have experienced
such a seemingly disastrous wetting without serious consequences. I
expect that the bales were able to dry without fungus growth setting in
because of very low spore levels due to using fresh and dry straw
during the build. In other cases though I have seen bales rapidly
growing mushrooms after a seemingly light wetting. I think the main
thing separating these cases is the presence or lack of- spores in the
bales.

I wonder what others feel on this topic. I strongly believe that one of
the main tricks to longevity to SB walls is getting the bales dry in
the walls and then getting the building rapidly out of the after
building moisture phase.

Rene



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Date: 17 Jan 2005 10:13:18 -0600
From: "John Straube" jfstraube@...
Subject: RE: GSBN:Leaving bales bare

Rene's observations are similar to mine and I agree with them
However, spores exist is all bales unless they have been irradiated or
equivalent for some time
The difference in why under some conditions things take off and others they
don't is likely (not for sure) due to the level of growth that already
occurred in the bales before the event.
Spores take some time to start growing and when they go dormant, due to
drying or whatever, it takes much less for them to start again.
Hence, I think the reason is that bales that have some growth, not
macroscopically visible, will go moldy really quickly, while those with only
spores take a lot longer to start.


Dr John Straube
Assistant Professor
Dept of Civil Engineering & School of Architecture
University of Waterloo
Waterloo, Ont. Canada
<a  target="_blank" href="http://www.civil.uwaterloo.ca/beg";>http://www.civil.uwaterloo.ca/beg</a>


- -----Original Message-----
From: GSBN [<a  target="_blank" href="mailto:GSBN@...";>mailto:GSBN@...] On Behalf Of Rene Dalmeijer
Sent: Monday, January 17, 2005 9:13 AM
To: GSBN
Subject: GSBN:Leaving bales bare

Fellow SBers,

A topic I have been pondering recently concerns the logic of rapidly
applying plaster to bale walls. I plead for doing so.   Based on the
following logic:

Fresh dry bales are basically relatively spore free. If these bales are
rapidly encased in plaster there is very little chance that the straw will
be infected with new fungus spores. Therefore seriously improving the
chances of a long life span of the SB wall even in the event of a one time
wetting.

In the past I have heard about and seen SB houses that have experienced such
a seemingly disastrous wetting without serious consequences. I expect that
the bales were able to dry without fungus growth setting in because of very
low spore levels due to using fresh and dry straw during the build. In other
cases though I have seen bales rapidly growing mushrooms after a seemingly
light wetting. I think the main thing separating these cases is the presence
or lack of- spores in the bales.

I wonder what others feel on this topic. I strongly believe that one of the
main tricks to longevity to SB walls is getting the bales dry in the walls
and then getting the building rapidly out of the after building moisture
phase.

Rene

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