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(jacob) wrote in message . com...
Granite is really cold, a bad insulator. You might consider dry lining
with insulating materials.

cheers

jacob

Thanks for all the advice, the comments about the DPC are interesting.
Granite is and igneous rock which I think means it is water proof, the
mortar is not but as pointed out evaporation from old sandy lime
mortar would probably take care of this. Anyway of to investigate
costs of getting services put in!

Regards
Robin