Tuesday, March 23, 1999 10:55:15 PM
GSBN Item
From: GSBN@...,Txinfinet Incoming
Subject: Digest for 3/23/99
To: GSBN
-> Re: Fungus in Earthen Render/Stucco
by Huff and Puff Constructions <huffnpuff@...>
-> Re: Fungus in Earthen Render/Stucco
by "Athena & Bill Steen" <absteen@...>

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Date: 23 Mar 1999 15:37:59 -0600
From: Huff and Puff Constructions <huffnpuff@...>
Subject: Re: Fungus in Earthen Render/Stucco

G'Day Strawbalers

Straw Wolf here. We seem to have a problem with black fungal growth on
our second coat 65mm/2.5 inches thick of clay and straw render. We
slurried a first coat of very wet clay without straw to give us a key
for the subsequent coats. We are not using netting of any shape and are
doing it the Steens' way.

The clay and straw mix was as Bill and Athena showed us and it is going
on very well and sticks like the proverbial. However after three to
four days a black growth has appeared on parts of the wall. I feel that
it will go away but I am not too sure. We are entering our Autumn and
the night temps drop as low as 12 degrees celsius and the day temps are
up to 25 celsius. Low humidity so it should cure well.

Anyone out there had this problem? Does it go away? Frank, whom some
of you have met, feels that he did it in Germany many moons ago and it
was decided not to continue due to the chance of the fungal growth
causing human illness, but that's the Germans for you. I want to
persevere with this wonderful way to render, good on you Bill and
Athena, you have opened my eyes but fungus I can do without.

To all of you who have written lately I will get back still, recovering
from the flu that Barbara Jones gave me.

Regards Straw Wolf
http://strawbale.archinet.com.au

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Date: 23 Mar 1999 20:51:59 -0600
From: "Athena & Bill Steen" <absteen@...>
Subject: Re: Fungus in Earthen Render/Stucco


John,

In response to your question below:
>
>The clay and straw mix was as Bill and Athena showed us and it is going
>on very well and sticks like the proverbial. However after three to
>four days a black growth has appeared on parts of the wall. I feel that
>it will go away but I am not too sure. We are entering our Autumn and
>the night temps drop as low as 12 degrees celsius and the day temps are
>up to 25 celsius. Low humidity so it should cure well.

My first question is whether or not the problem is occurring on the inside
of the building or on the outisde. Give the temperatures and humidity
levels, I would really be suprised if it were happening on the outside
walls. If so, I would truly have to say that I can't imagine what caused
it, short of something you brought back from California with you or spores
inherent in the straw, but even then it would not seem likely. If it is
appearing on the interior walls and the building has been closed up not
allowing the walls, it may well be that you need to open up the building and
accelerate the drying conditions.

As for what to do, the simplest remedy could be a thin limewash over the
existing plaster or the peroxide, bleach options. Shouldn't be hard to
remedy. Most interesting for me is the "why" of it. We have been working
in very similar conditions for the past several weeks without any such
difficulties.

Bill
>

----------------------------------------------------------------------

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