Before you choose to cover, remember that the kind of depends inter alia on the degree of slope roof (not all cover may be placed on flat roofs), and the shape of the roof (for example, the rigid cover very large area sheets are not arranged on the curves and rounding). In addition, they cover, the less likely to have the roof fall. This is important primarily because the roof of a smaller decline in arrears will be more snow and it will slowly flowed water precipitation. For example, the minimum slope for inclination is 14 °, and for traditional tile – 22 °. Coatings, which do not form a continuous, tight shell, you can lay on the roofs of a small angle, provided that they comply with additional security in the form of boarding and pre-mating.
The investor should also be aware that materials have different mass. This is very important, that the burden of coverage determines the truss structure, its carrying capacity, etc. In addition, sections of the elements count also sections and rafter spacing, type of pre-mating – whether it is film, and grate over it with patches and or rigid plating. Construction of roof structure must also take into account when exchanging old for new cover.
Choice of coverage should also take into account the climatic conditions and the environment. In areas where there are compounds in an atmosphere conducive to corrosion of metals (coastal areas, with large industrial air pollution), should anticipate a reduction in life cover with or from galvanized sheets. However, in the shade, near trees, the usual ceramic in a short time there may be mosses and lichens. Also, bituminous shingles, although to a lesser extent, are exposed to such a possibility. Therefore, in such places better lay ceramic tile instead of cement.