[Strawbale] Soda and ulexite in clay

Cas Mol chwmol at hotmail...
Sat Apr 23 23:14:38 CEST 2011

Hello Everybody,


building my house in Belgium and I just started rendering the bales on the
outside with clay (loam).

I added
some ulexite (sodium calcium borate, a natural mineral) against fungus. I’ve also added soda
(sodium carbonate). This lowers the viscosity of the clay so I can use less
water which should give me less drying shrinkage.


Anybody any
experience with these materials?



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