In article ,
bert writes:
Had ours done with foam about 30 years ago - no damp.

Mostly filled cavities are all fine.
Mine is blown fibre (strangly, done at build time, and injected
from the inside), and my parents had blown fibre done 5-10 years
ago in their 1950's house without any problems.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]