Natural slate and a waterproofing membrane come preassembled in panels in CUPA Group’s Readyslate roofing system. Modules are composed of six 12-inch-by-8-inch, 3.5 mm-thick, hand-quarried natural slates—predrilled for nailing and marked with a reference line for overlapping courses—backed by a self-adhering bituminous waterproofing membrane. According to the manufacturer, modules are lightweight and require no specialized labor for installation. Readyslate is priced at $4.40 to $5.25 per square foot.

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