In article , "Steve Barker LT" wrote:
I've mentioned in other posts about our 135 yr old house we're working on.
At this point I'm rebuilding the floor on the lower level. This house
basically sits on the ground. My new joists will be about 4" off the dirt.
I've been through the "to vent or not to vent" threads about crawl spaces.
I've decided not to ventilate. It's been closed for 135 years, it can keep
being closed. My question is, IS there any reason why I shouldn't fill this
space will insulation? Whether it be fiberglass or blown cellulose? In a
few days I'll have all new joists and proper center support and will
probably insulate unless there's some reason I shouldn't.

I don't see how that insulation will do much insulating. A shallow
unvented crawl space makes for a reasonable insulator by itself.
However, it could provide a bridge/path for moisture or bugs to cross
from the dirt to the joists and floor. It might also make subsequent
jobs a little harder (e.g. pulling some new power or CAT-5 cable).

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