I’m in SE Pennsylvania and just had our small crawlspace insulated/encapsulated over the summer. This is what they did

1. Put in a sump (get a little bit of water, not much. It hasn’t ran yet)
2. Put down dimpled plastic liner on dirt floor
3. 2-inch foil faced rigid foam insulation on walls with the plastic anchors into block walls
4. A thick plastic over top of the dimpled floor
5. Tape at every seam