Subgrade prep for raised concrete-less slab

I’m building a small addition, ~16×16, with ICF stem walls scribed/pinned to solid bedrock.  Zone 6A. The interior will be filled and have a concrete-less raised “slab”.  The bedrock varies… I’m building a small addition, ~16×16, with ICF stem walls scribed/pinned to solid bedrock.  Zone 6A. The interior will be filled and have a concrete-less raised “slab”.  The bedrock varies…Read MoreGreenBuildingAdvisor