R-VALUE: 40.0, SUITABLE FOR: new construction.THERMAL PERFORMANCE: A core of 73⁄8-in.-thick XPS (R-5 per in.) yields R-38. A core of 51⁄2-in.-thick polyisocyanurate (R-5.8 per in.) yields R-40.PROS:• Once on site, panels assemble very quickly.• Typically