[GSBN] Sticking clay on top of lime?

[Misha Rauchwerger]

Rikki
You might consider a coating of something like "Weldcrete" on the existing
surface, or something like a wood glue coating (PVA water based) that binds
the undercoating, and allows the the earthen coating to stick to a sealed
base layer.

We've had good success using this product under these conditions, and have
used it for lime and earthen plasters on a number of other stable
materials, such as drywall and stone.

Misha Rauchwerger

On Tue, Jul 28, 2020 at 7:12 AM Rene Dalmeijer via GSBN <
gsbn at lists.sustainablesources.com> wrote:

> Derek,
>
> I fully agree with what you say on both points. A little test is a very
> good idee just to see how it works.
>
> I would like to add though that stubborn clients can help to stretch the
> scope of out knowledge. If you ask any conventional builder about building
> with bales.. well you already know the answer.
>
> Another thing that could help in this type of situation is a really fat
> clay slip sprayed or brushed on. As the pictures show there is a lot of
> crevices to key into but I also have the impression that the lime substrate
> is very unstable meaning an almost impossible task to achieve a stable
> finish.
>
> Basking in the reclaimed swamp at the old mouth of the Rhine
> Rene Dalmeijer
>
> > On Jul27, 2020, at 18:31, Derek Roff <derek at unm.edu> wrote:
> >
> > People drawn to natural building have hopes and dreams.  Generally, that
> is a good thing.  It is also frequently a problem, when our hopes and
> dreams lead us to try things that are risky, or known to fail.  How does a
> professional builder work with a client, who wants to follow a dream
> instead of the knowledge and experience of the natural building community?
> >
> > Perhaps some small-scale experimentation can show the clients what they
> may face in trying to apply clay over lime wash.  Success can only occur if
> this specific clay can bond well to this specific lime.  A small test may
> show that adhesion is a problem.  Unfortunately, a test can’t show what
> happens over time.
> >
> > Best wishes,
> > Derek
>
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