Good or Bad Idea? Adding Rigid Insulation to Top of Vented Roof?

I have an older cottage I live in that is 1 hour north of Raleigh near the NC / VA state line in Zone 4.  The summer heat is brutal… I have an older cottage I live in that is 1 hour north of Raleigh near the NC / VA state line in Zone 4.  The summer heat is brutal…Read MoreGreenBuildingAdvisor