At the root of any great book is a great premise. Architects of world-renowned structures like the Vancouver Public Library are discovering the same is true for innovative green roof designs.

The protected membrane roof (PMR) is another great premise. Developed by Dow in 1970, the PMR idea literally turned roofing theory upside down by placing the membrane below STYROFOAM™ Brand Extruded Polystyrene Insulation. This unique inverted system adds longevity to the roof system by protecting the membrane from the elements. And it provides the ideal foundation for a green roof system, one that’s proven to last at least 35 years. That’s enough to read through War and Peace. Twice.

Learn more about the sustainable benefits of protected membrane roof assemblies.