It is possible to design a flat roof assembly without spray foam or rigid foam products with the use of an air tight smart vapor retarder membrane, which prevents vapor diffusion and air leakage from the interior into the roof assembly, but allows moisture to dry out to the interior, reducing the risks of the "double vapor barrier" scenario. This strategy allows for the installation of air and vapor permeable insulation materials like mineral wool, blown-in cellulose, wood fiber, and fiberglass to be used in isolation, without the need for excessive rigid insulation to be installed outboard, allowing for a lot more flexibility in the design.
This video is from "Flat Roof Insulation Strategies (For Architects + Contractors): • Flat Roof Insulation S...
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