Copper is the only flashing we trust.
Copper is the most forgiving material in roofing. It moves with temperature, it self-heals tiny pinholes, it doesn't rust, and properly soldered seams hold for a century. The catch: it has to be installed correctly. Steel fasteners corrode copper through galvanic action. Screws don't move with the metal. Improper sweat-soldering fails in the first New England winter.
We install copper as flashing on every slate roof we do — at the valleys, chimneys, and dormers where water actually decides whether your roof leaks. We also install full copper roofs: standing-seam, batten-seam, and turret/bay-window copper. Half-round and K-style copper gutters, hidden-hanger systems, and copper downspouts that age into the same green as your neighbor's 1898 conductor head.
We do not install pre-painted copper, copper-toned aluminum, or copper alloys that look right and age wrong. The patina is the point.
