Upgrade to continuous exterior insulation for roof only?

The Question Itself: Is it a bad idea to redo an existing structure’s roof to have hybrid insulation (30% foam board + 70% mineral wool) while redoing the walls/crawlspace to… The Question Itself: Is it a bad idea to redo an existing structure’s roof to have hybrid insulation (30% foam board + 70% mineral wool) while redoing the walls/crawlspace to…Read MoreGreenBuildingAdvisor