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The external wall is being raked out and re-pointed with lime mortar (current pointing is cement and largely fucked), then left bare. It's a south-facing wall, so shouldn't ever get soaked through its 230mm thickness.
I used a few calculators to verify wall build-up and dew point etc, like Ubakus and Changeplan.
ectoplasmosis
will you be rendering the external to prevent moisture from coming inwards? how did you calculate dew point or did builder?