The construction of pitched roofs is subject to constant movements caused by the wind, therefore the roof covering must be so constructed, so that it does not transfer the stresses thus caused. Many durable and proven coverings consist of small-sized elements, placed on an overlap, which may shift slightly in relation to each other. The advantages of small-size roofing include the possibility of air exchange from the layers underneath this covering and easy ventilation of the roof slope..
Roof tiles are among the best proven and reliable roofing of pitched roofs. Technical development led to the development of shapes, thanks to which the tiles perfectly drain water from precipitation and regulate the phenomenon of the so-called. blowing.
The resistance of individual types of tiles to rainfall depends on the shape of its locks and surfaces as well as the angle of the roof slope., the smaller it is, the easier the roof is to ventilate.
For each model of a tile, the optimal angle of inclination of the roof slope is determined, at which the tile achieves the recommended resistance to precipitation and wind.
Cement tiles and ceramic tiles, due to the different arrangement of locks, differ in the way of measuring the roof surface.