I have a vapor barrier on the dirt floor already. The insulation will go in the floor joists above, paper side down.
The downside to installing faced fiberglass insulation in a dirt floor crawlspace vs non-faced
crawlspaceinsulation
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Best Answer
"When fiberglass batts are installed in the ceiling of a crawlspace, gravity always wins in the end" source
Faced or unfaced, it is almost always a bad idea to insulate the floor above a crawlspace, especially with fiberglass batts. Insulate the crawlspace walls and seal the vents instead. The one exception is if you are in a flood zone.
A sealed crawlspace will be drier, healthier, and usually more energy efficient than one insulated at the floor.