Cold climate slab on grade – GreenBuildingAdvisor

hello all, building a home in climate zone six a, relatively high water table, building slab on grade because we cannot dig a basement. my Builder wants to use precast superior walls for frost walls for the slab, I have not been successful trying to convince him to do his first frost protected cell foundation.  it seems like excavating less would be a good thing with the water table only 4  feet down in wet seasons. he wants to use The precast superior walls because he can build up the ground and put the slab a little higher above grade. The gravel that these will sit on will potentially be wet a month or two out of the year.  

Anyone here done this before? Is there a good way to insulate the slab perimeter using the superior precast walls?  

Any insights or advice as always would be greatly appreciated.

Thank you.