Radmat ProTherm Quantum Inverted Roof Insulation System has been developed to allow the thinnest possible construction. Consisting of Quantum VIP panels (Vacuum Insulation Panels), Regupol RCM, XPS Infill, XPS layer and Grey Thermal Sheet, a Protherm Quantum VIP Inverted Roof System achieves a ‘U’ value of 0.15 W/mk2 using 80% less thickness than a traditional XPS insulation. ProthermQuantum RadmatBuildingProductsLtd