I have come to understand, from a local "old house" guru, that the blown in insulation is very damaging to wood siding (and structure) if you do not have a vapor barrier. I am looking to use a spray foam to insulate my plaster exterior walls on my 1914 Craftsman home. Is this a good product
and, does the "closed cell" foam prevent the moisture problems associated with the regular blown in insulation?\
Thanks for your help/suggestions!