I looked around at Home Depot today,
and they have the R-13 faced rolls -
It appears that the facing should be
facing the "warm floor",
with the bare fiberglass facing outside
toward the air -
Is this going to present an airborn problem
with the fiberglass particles wandering
thru the air in the crawl over to the basement area ?

hmmm - just read this article that basically says
the floor insulation is not worth the effort -
http://www.askthebuilder.com/N2-Base...sulation.shtml