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 v

Not all slates are created equal. Slates are rated on 3 levels by the American Society for Testing and Materials (ASTM): S-1 has an estimated lifetime of 75-100 years, S-2 with 50-75 years, and S-3 is so poor that it's not used in roofing. What gives this Metamorphic rock longevity is long term compression. S-2 slates are usually compressed between 200 - 300 million years, and trust me that's still pretty good, it's much better than asphalt shingles. But the true Cadilla