Standing-seam roof manufacturers have long touted their products’ suitability for rooftop solar installations, and now one of them is proving the point at its own manufacturing plant. ATAS’ Mesa, Ariz. facility now features 576 solar panels atop its existing metal trapezoidal seam roof, which is expected to pay for itself in energy savings in four years. A larger system is planned for its Allentown, Pa. plant.