Slate is a metamorphic rock derived from shale and evolved from a sedimentary rock of clay or volcanic ash. It works well in compression and can have a durability expectancy of up to 100 years. For years it has been used for roofing, floor files and any smooth flat surfaces.
Here we see slate used as residential siding which not only gives the house a unique appearance but also performs well with thermal efficiency. This house in Laval, Canada, a suburb of Montreal, is sited in historic farmland in a subdivision with great sensitivity to the existing topography, stream and mature trees. The house uses sustainable processes such as geothermal and passive solar heating, natural water collection and low energy electrical fittings.