Cob: Re: White crystals

[marksaich]

It is almost certainly effervescence. This is the leaching of salt out of
the wall. It gets in there from the sand (particularly beach sand) and
sometimes from the water. Do you know exactly where both came from?
To get rid of it you need to brush off with a stiff broom or brush and clean
water. It will keep coming through until it is all out. Be persistent and
patient.
Mark

----- Original Message -----
From: Rosemary Lyndall Wemm <lyndall at neurognostics.com.au>
To: <coblist at deatech.com>
Sent: Sunday, May 21, 2000 7:22 PM
Subject: Cob: White crystals


>
> Hi All!
>
> The rendered foundation boots of my cob shed have patches of white
> crystaline substance adhering to the surface.  Can anyone tell me what it
> is?  The concrete and brick tile surfaces are rendered with a mortor
> consisting of 6 parts sand: 2 parts red clay [which may have aluminium in
> it]: 1 part lime: 1 part grey cement + water to mix.
>
> - Rosemary
>
>
>  ---------------------------------------------------------------------
>  Rosemary LYNDALL WEMM,
>  B.Mus.(Inst.), T.S.T.C., B.A.(Hons), M.A.(Neuropsych.), etc.  _--_|\
>  Clinical Neuro-psychologist                             Perth/      \
>  Perth, Western Australia    lyndall at neurognostics.com.au  -->\_.--._/
>  ------------------- http://www.neurognostics.com.au ---------------v-
>
>
>
>