Insulated a new addition crawl space. Code only calls R10
(upstate NY). I see rolls of this white material used in new
home construction. 4'x50' rolls, white vinyl with fiberglass
against the CMU wall. I have also seen R19 un-faced fiberglass
up against CMU wall. The R19 (pink is a bit cheaper sq ft) than
the R10 vinyl faced. But what is the best way to insulate a
crawl space 5 CMU block in height?

Thanks
TP