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Re: GSBN: Earth plasters

> Hi Mark Ð IÕve not found mould on earth plasters to be a problem Ð I have seen
> darker surface ÒpatchesÓ 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.
> IÕve 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 Ð there is no mould after three or more years of this, even though
> we live in a wet and humid climate Ð 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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