On Fri, 03 Jun 2005 11:33:26 -0500, Asher Hoskins
wrote:

That's next on my list of things to investigate! Am I right in assuming
that a coat of lime mortar on the outside of the wall would need to be
balanced by a similarly breathable covering+paint on the inside of the
wall?

Yes - but not underneath. DPCs are a good idea no matter what the technique
or era.