Mark S. Graham
www.marksgraham.com
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EnergyWise Roof Calculator
LinkedIn profile
National Roofing Contractors Association (NRCA)
NRCA Technical Services Section
The NRCA Roofing Manual
NRCA edge metal testing certification (ANSI/SPRI ES-1)
Roof Wind Designer
Twitter (@MarkGrahamNRCA)
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