75–200 years depending on the quarry source. Welsh and Vermont slate routinely exceed 150 years. It's the only roof material that can outlast the structure it protects.
Slate weighs 800–1500 lbs per square (100 sq ft). We assess your framing before quoting. Many homes can be reinforced if needed; others are better suited to synthetic slate.
Products like DaVinci and CeDUR offer authentic slate appearance at 1/4 the weight. 50-year warranties, Class A fire rating, and walkable — a strong alternative for homes that can't carry natural stone.