Help finding source for Graphite EPS

Looking for GPS 40psiAnyone have a source or “part” number for Graphite EPS board? We’re located in MidAtlantic area outside of Philadelphia. Ready to go with a floating plywood slab… Looking for GPS 40psiAnyone have a source or “part” number for Graphite EPS board? We’re located in MidAtlantic area outside of Philadelphia. Ready to go with a floating plywood slab…Read MoreGreenBuildingAdvisor