Here are 3 features of zero energy foundations.
Insulation under slabs - R-15 minimum for radiant slabs, R-10 minimum for unheated slabs
Air sealed joints and penetrations in framed floor
R-38 minimum insulation in framed floor
Here are 3 features of zero energy foundations.
Insulation under slabs - R-15 minimum for radiant slabs, R-10 minimum for unheated slabs
Air sealed joints and penetrations in framed floor
R-38 minimum insulation in framed floor