Foam board under exposed fastener metal roofing

Looking to build a 30×40 garage with 2×4 walls and using the exposed fastener metal roofing. I understand standing seam would be better but thought maybe it would be better… Looking to build a 30×40 garage with 2×4 walls and using the exposed fastener metal roofing. I understand standing seam would be better but thought maybe it would be better…Read MoreGreenBuildingAdvisor