Calidad 70 Spanish roofing slate is ideal for residential properties, supermarkets and commercial properties, and is suitable for the English, Welsh and Scottish markets. Calidad 70 slate has a smooth, slightly textured appearance and is free of visible pyrite, creating an aesthetically more pleasing finished roof covering. This roofing slate, which is blue grey in colour is very easy to grade and lay on the roof and is sourced directly from the slate quarry, which is located in the Galicia region of northern Spain. This roofing slate complies with all relevant British and European standard BS EN 12326 and the test results show that this slate is A1, T1 and S1.