Environmentally-friendly
Slate is a naturally-occurring material, and requires very little processing, unlike other products like asphalt shingle roofing and metal roofing. This makes it more environmentally-friendly.
Very little roofing waste
Even when a slate roof must be replaced, the slates themselves can often be re-used for another roofing project, or for other purposes, like flooring, and building garden pathways, or even