Natural slate has been used as a building material since the Iron Age and has been used consistently on roofs for about 300 years. It is tough and durable and if fitted correctly can outlast the timbers on a roof.
Clay tiles have been used since Roman times but became widely used from the 13th century. They can withstand natural climatic elements and improve with exposure.
Concrete tiles started being used in the latter part of the 19th century. They proved to be very popular as they mimic the look of clay tiles at a fraction of the cost.
These are traditionally made from Cedar or Horse chestnut. They are a beautiful, natural, sustainable material and can usually be sourced locally.