- Extruded polystyrene
- Batt insulation
- Spray polyurethane sealant (spray can or two-part)
- 15 mil polyethylene sheet and sheathing tape
- Tape or sealant compatible with polyethylene and concrete
- Insulation retention system
Protect the polyethylene sheet on the crawlspace floor with carpet or rubber mats if foot traffic is expected in the crawlspace.