After preparation, thus, the crate begins the second stage — the installation of bitumen tiles. For convenience, manufacturers supply tiles with set blocks, each of which consists of several elements, as a rule, nine pieces. This format is very convenient for roofers, since it optimally combines the time spent on the installation of bitumen tiles with a minimum amount of the necessary staff. Thanks to this technology, one roofer can do the work, and it is not necessarily highly qualified.