Decra Roof Systems was established in this country in 1977 when it introduced to Europe the world's first lightweight roof tile. Decra lightweight roof tiles are the most popular in the world, manufactured in 4 continents and sold and installed in over 70 countries. Approaching 100 million square metres of tiles have now been installed, the equivalent of nearly one and a half million average terraced houses - almost enough for the total population of Greater London.