Annual residential simulations were run in 13 US cities to determine the energy savings of using an insulated foam tile roof in retrofit applications where ceiling insulation was only R-11 or R-19. Variations included leaving the attic vented and sealing the attic space.
Buildings - Roofs
Florida Solar Energy Center and Sonne, Jeffrey, "Simulating The Energy Performance Of A Foam Roof System" (2015). FSEC Energy Research Center®. 141.