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Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.
Foil-faced rigid foam and spray foam can be used to insulate a basement on the interior; use good moisture management techniques to keep the basement dry
Infrared image of a rim joist
Insulation not aligned with subfloor or joists
Right – Air barrier is present and installed between the floor system and unconditioned space
Right – Penetrations through the floor are air sealed
Right – Sub-floor insulation is properly installed and supported
Wrong – No air barrier is present between the floor system and unconditioned space
Wrong – Penetration through the floor is not air sealed
Wrong – Sub-floor insulation has gaps, compression, and misalignment
Wrong – Sub-floor insulation is not properly installed or supported