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GSBN:Earth plasters



Does anyone know about the Moroccan takalak plasters, which are apparently
used in bathrooms? I believe they are supposedly used in waterproofing of
baths and showers too?
Andy

-----Original Message-----
From: GSBN [<a  target="_blank" href="mailto:GSBN@...";>mailto:GSBN@...] On Behalf Of Graeme North
Sent: 11 October 2007 09:32 PM
To: GSBN
Subject: Re: GSBN: Earth plasters

> Hi Mark &#xD0; I&#xD5;ve not found mould on earth plasters to be a problem &#xD0; I have
seen
> darker surface &#xD2;patches&#xD3; on fermented earthen material eg mud bricks or
cob
> where the  mix had sat for a while (weeks) before using and had fermented
a
> bit, but I do not think these darker patches that arise from this are
mould.
> Mould may occur if the walls are very slow to dry and/or are not fully dry
> beneath earth plasters, or else the building does not have sufficient
eaves
> and moisture keeps the wall wet.
> I&#xD5;ve got earthen plasters (with paper pulp) in my own bathroom where they
get
> really steamy at times, (from showering) which not only dry out really
> quickly, but also suck moisture out of towels and wet floors keeping the
room
> really dry &#xD0; there is no mould after three or more years of this, even
though
> we live in a wet and humid climate &#xD0; virtually never less than 60%, often
well
> over 80% - 90%. 
> 
> cheers
> 
> Graeme
> 
> 
> 
> 
> 
> 
> Graeme,
> 
> Thanks for your submission and insight. The first I'd heard of
'fermenting'
> straw (or paper) was from some friends from NZ, Sven and Sarah Johnston,
> who hosted a workshop and a guest presenter was Tom Raven, the colorful
> Frenchman, who uses a fermented mix, like bakers use a yeast starter for
> baking breads. Tom swears by this fermenting and concurs with you on added
> durability of the earth plasters. The Johnstons found they had some mold
> issues, maybe as a result of this mix tho. Have you experience any issues
> with molds?




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