Changing a protected membrane roof
or aggregate ballasted roofing system to a conventional roof or using a modified bitumen or single-ply membrane that weighs less than the existing roof membrane will often provide the necessary spare capacity required for the PV installation.
The topics include thermoplastic polyolefin roof membranes exposed in the western US for seven years, principles of design and installation of below-grade and building deck waterproofing in 2010, dual barrier protected membrane roof
assemblies, roofing assembly simulated heat and light test, and electrical conductance methods for locating leaks in roofing and waterproof membranes.
In a Protected Membrane Roof
(or "upside-down" roof), a closed-cell, extruded polystyrene insulation is placed on top of the waterproofing membrane; in a conventional roof, the insulation is placed under the waterproofing membrane.
A Protected Membrane Roof
(PMR) system with STYROFOAM[TM] extruded polystyrene insulation holds important advantages over a traditional roofing system.
A protected membrane roof
(PMR) consists of a membrane placed directly on the structural deck.