More than 250 roofs are made per day around the world using Cupa slates.

The Heavy 3 slate is without question the best Cupa offering for Scottish roofs and always well received by roofing contractors. Its extra heavy thickness of 7-8 mm gives it the perfect strength to withstand Scottish weather while boosting the value of any property.

The Heavy 3 is quarried from the CUPA PIZARRAS No3 quarry in San Pedro de Trones (León) in northern Spain. This quarry has been in operation since 1892 and produces around 25,000 tonnes each year.
The slate is blue black with a slightly gritty texture, and in some samples well defined parallel lines are clearly visible on the cleavage surfaces.
Another obvious feature of the slate is the presence of metallic cubes approximately 2mm in size. Sometimes these cubes are randomly distributed throughout the slate, while in other cases they are concentrated in discrete bedding layers. These cubes are of iron sulphide, known as pyrite and the H3 are known as `stable` pyrite: These inclusions generally do not cause issues even after prolonged exposure to the elements.

As you are choosing a natural product it is recommended to allow a 10% surplus when ordering your slates. This accounts for cutting, breakages and natural irregularities. This precaution ensures full coverage, consistency in appearance and will help prevent delays during the fitting process.