You need to be very careful here Deliper. The CMHC has put out a
booklet called Keeping the Heat In. They strongly recommend that you
DO NOT insulate the rimjoist in cases where the joists are embedded in
concrete, just air-seal the cracks. The reason is to that insulation
will keep the moisture from drying and the joists will rot. Here is
the
link...http://oee.nrcan.gc.ca/publications/...Insulating.pdf
Be patient, this is a large PDF file, so it takes a long time to load
up. The material on embedded joists begins on page 65.

For others, this material is designed for the cold Canadian climate, so
it would apply to the northern US as well.

Steve