The Commercial Energy Code in Minnesota is based on ASHRAE Standard 90.1-2004 with amendments.(http://www.energycodes.gov/states/state_info.php?stateAB=MN). 

The amendment document  contains table’s addressing  nonresidential, residential and semi heated minimum insulation values for both southern and northern Minnesota climate zones.  They specify R-10 insulation must extend  from the top of the footing if placed on the exterior of the foundation wall or to the top of the slab if the insulation is on the interior side.

In this region, typically we have found that the foundation wall is poured to 100 and the slab is poured on the interior side of the wall.  By using EnergyEdge in the wall form to insulate and protect the top 8″ of otherwise expose insulation, and extending rigid insulation below, where it will typically be protected by grade, current energy codes can be satisfied.