Unvented flat roof, insulating from outside?

Boston, MA area here (climate zone 5A), with a flat roof, unvented. I’m replacing my roof and fascia boards on my 1950s era house, and am hoping to do what… Boston, MA area here (climate zone 5A), with a flat roof, unvented. I’m replacing my roof and fascia boards on my 1950s era house, and am hoping to do what…Read MoreGreenBuildingAdvisor