your carpenter has a point about never seeing mold in houses without a
vapor barrier. i hink old houses are so leaky that they are vented
naturally. but if this is a basement with concrete walls, it might be
a different story. my house is 90 years old--probably without a vapor
barrier, but someone tried to finish part of the basement some years
ago and now it's a rotted mess. it was water from the outside, i'm
pretty sure. so i'd ask him how many old basements insulated with
fiberglass he has dealt with.