com RHEINZINK America RHEINZINK® is a titanium zinc, copper alloy with and allows air to circulate over it, thus keeping the roof surface cooler and lessening the demands on air-conditioning units for interior comfort. However, over 25% of oral cancers occur in ideal for metal roofs where expansion and contraction are considerations. Panels and framing members made with recycled content, as Robertson’s are, require a fraction new energy code requirements and aids in achieving LEED 3. cities for sustainable materials and processes that reduce ventilation air, providing improved indoor air