Of all metal roofing applications, hand tooled, double lock copper is by far the longest lasting system. All the details are crimped, turned, hand anvilled with minimum cuts and soldering. For lower slope or decorative roofs, copper is historically accurate and most importantly sends an old, beautiful historical home from the 19th century straight into the 22nd century maintenance free! For true historians that not only appreciate the visual appearance of copper but also value the traditional, hand-tooled German techniques of precision and solderless folding, hand tooled double lock copper is unmatched.