Thickened slab with 300 psf load – will 30 psi rigid foam support that?

Our slab on grade home has a thickened slab under a load bearing wall ( about 8 feet long).  Rigid foam will be placed horizontally under the entire slab.  The… Our slab on grade home has a thickened slab under a load bearing wall ( about 8 feet long).  Rigid foam will be placed horizontally under the entire slab.  The…Read MoreGreenBuildingAdvisor