The slate used for covering the roofs of most buildings in Besse-et-Sainte-Anastaise, in Puy-de-Dôme, has numerous advantages. It has a significant lifespan, which exceeds a century. The slate is also resistant to frost, rain, and bad weather. Chosen for its aestheticism, it does not fade over time and also holds considerable insulating properties. Finally, this ecological and natural material keeps mosses from developing.