OK Flat roof insulation assembly (R value related)

Hi All, thanks for any forthcoming help and opinions!Zone 4, close to 5, NJ Possibly getting the chance to install a new TPO + Rigid insulation on the exterior deck of… Hi All, thanks for any forthcoming help and opinions!Zone 4, close to 5, NJ Possibly getting the chance to install a new TPO + Rigid insulation on the exterior deck of…Read MoreGreenBuildingAdvisor