For years the National Roofing Contractors Association (NRCA) and many top solar roofing professionals have discouraged solar contractors from using ballasted racking systems.
In the realm of building environmentally responsible rooftops, there are a number of means to an end: high R-value insulation layers, highly reflective roof surfaces, vegetative systems, photovoltaic arrays and solar thermal (i.e., hot water) systems.
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