Even with rebates and tax credits, rack-mounted rooftop solar arrays are far from free. GAF Energy, a sister company of roofing giant GAF, has developed a low-cost solution: Timberline Solar, a rooftop system featuring solar “energy shingles” that can be installed by a roofer with a nail gun. The new product, certified as a roofing and solar product and warrantied for 25 years, could disrupt solar companies by giving homeowners the option to install a new roof and renewable-energy system at the same time—just hire a roofing company.
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