Gray Green (Semi-Weathering) Slate is the quintessential Vermont slate. Quarried since the middle of the 19th century, it defines the industry in Vermont more than any other. The tones vary from medium grey to light green. It is of medium-smooth texture and is available in a large number of sizes and weights.
Gray Green (Semi-Weathering) Slate is very strong and durable, with a lifespan of over 100 years. It is very easy to install.
When newly quarried it is gray/green, as pictured. When exposed to the elements over time a certain percentage of the slates (perhaps 20%-40%) will change color, developing the tones of brown, pink, and buff seen on distinctive roofs throughout the Northeast.
Varying lengths and thickness can be made to order.