01
Begin with documentation
Record slate dimensions, colors, thickness, texture, coursing, decorative patterns, hips, ridges, flashings and repairs. Elevation-by-elevation photographs and sample boards help establish what must be retained or matched.
02
Repair before replacement when feasible
Isolated broken slate, localized flashing failure or limited deck damage may not justify removing an otherwise serviceable roof. A condition survey should quantify failure and distinguish the slate field from metal and substrate problems.
03
Match character as well as color
Replacement slate should consider thickness, surface, edge, size and weathering—not just a broad color family. Mockups and approved samples are especially important on prominent elevations or projects subject to preservation review.