Inverted insulation and waterproofing roof systems are a proven way for the upgrade of a building’s energy efficiency as they both insulate and waterproof a roof. ALCHIMICA’s solution based on the certified HYPERDESMO® – PB -2K bituminous extended polyurethane waterproofing membrane offers a seamless, easy to install with a root resistant properties application. For better system results, the installation of a extruded polystyrene is needed because it withstands greater stresses, has a high thermal efficiency standard and it does not allow the penetration of moisture, achieving absolute waterproofing.