The roofing industry certainly has become more sophisticated in
its approach to designing energy-efficient and environmentally
friendly roof systems. For example, NRCA recently published The
NRCA Green Roof Systems Manual—2007 Edition, an
entire technical manual dedicated to green roof systems. In
addition, the possibility of embedding photovoltaic cells in roof
membranes is now a reality.
Roof systems must have been designed and installed...
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