05-25-2022, 08:55 PM
Rigid foam with an underlayment on top of it can be weight bearing, and will insulate the whole floor more evenly. Would have to check what is currently available.
Insulating underneath just between the floor joists will also work. But the joists themselves may have lower insulating value than the rigid foam.
Insulating underneath just between the floor joists will also work. But the joists themselves may have lower insulating value than the rigid foam.