Unvented Flat roof Multifamily bld.

I have a multifamly building in Climate zone 5.  The building plans call for R20 rigid foam board above the roof deck and R30 fiberglass batt in the truss cord… I have a multifamly building in Climate zone 5.  The building plans call for R20 rigid foam board above the roof deck and R30 fiberglass batt in the truss cord…Read MoreGreenBuildingAdvisor