Cob: Nova program

[Darel Henman]

Karen,
  thanks for the information.   That is highly interesting because in
Japan I found that they sometimes used mineral salts left over in the
salt making process (after the sodium chloride (table salt) has been
extracted, in their rammed earth floors for kitchens and also for
pathways around the outside of the house as well as for water drains.

Darel

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Dognyard wrote:
> 
> Did anyone see the Nova program on PBS called "Lost Treasures of Tibet"?
> The program was primarily about restoring the ancient buddhist paintings
> in a monastery, but part of the restoration included re-roofing the
> building to keep water out of the monastery. The roof was made with
> timbers, stones and local clays...including a special clay with a high
> salt content (their description) that was sprinkled on as a final
> coating that would soak into the tamped clay roof at the first rain, and
> that would swell and help seal the roof.
> 
> Neat program!