Cob: Internal lintels?

[Amanda Peck]

Aha.  Especially things like maple?

That explains why Roy specifies softwood sawdust and Charmaine Taylor says 
in her papercrete book that it doesn't matter much if at all.
...............
Kyle wrote:
     Softwood sawdust is best for use with cement as hardwood contains 
sugars
that can interfere with the set.

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