I am trying to figure out how best to insulate the walls and crawl space of my 1830s home. The attic was insulated with vermiculite.
I read your post from 2010. Any updates? I'm concerned about outgassing and vapor barriers. We have plaster and lath walls. I've been immobilized by a lack of clarity on all this...greatly appreciate your help.
Dense pack cellulose into the walls, then blow dense pack cellulose on top of the vermiculite in the attic.
Use caulk and backer rod to seal under the bottom plate and then use batts of Roxul to insulate the walls of the crawl space.
No outgassing and no vapor barrier.
For more information:
Read "I want to add wall insulation to my 1920 home. I have two locally available options -- Icynene and Tri-polymer foam. Can you advise me?" a Q&A answered by Alex Georgiou.