Roofing tile and method for producing such a roofing tile

A process for producing a roofing tile composed of a concrete material consisting essentially of a binder, a rock particle fraction, a lightweight aggregate, a pigment and added water, which has at least one watercourse and a lateral interlocking joint consisting of a covering fold and a water fold, and highly loaded regions located between the covering fold and the water fold, which comprises the following steps:

• mixing the concrete material consisting essentially of the binder, the rock particle fraction, the lightweight aggregate, the pigment and the added water;
• shaping the mixture by extrusion;
• and
• parting the shaped extrudate obtained to form sections and curing the sections, characterized in that
• the ratio of water to binder is less than 0.3,
• the lightweight aggregate consists of a material which is hydrophobic and/or nonhygroscopic,
• the lightweight aggregate comprises uncrushed and/or coated and/or hydrophobicized expanded clay, hydrophobicized pumice and/or hollow glass spheres and/or mixtures thereof,
• the roofing tile after curing has a density in the range from 1.6 g/cm3 to 1.9 g/cm3,
• where the roofing tile has a thickness of from 5 mm to less than about 7.80 mm in the highly loaded regions, and
• where the roofing tile has a total porosity above 25% and an open porosity of less than 10%.