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If this is a heated space, treat it the same as a bsmt.

I don't know how cold it gets where you are, but here if I use 2" styrofoam, no VB. Less that 2" and they require one.

I would not use one, seal all the seams, and DO NOT insulate the ceiling of the crawl space.

If this is an unheated space, seperate from the rest of the house you need to vent it, provide access, and insulate the ceiling.

Sounds like you have the first senario.
 
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