Historically, tiles were installed only on high pitch roofs. But nowadays when isolation materials have improved a lot, some of the tiles can even be installed on a 7-degree roof. Of course, it should be remembered that such a roof pitch requires a double isolation layer. Most tiles can be installed from 10 degrees. But the ideal option would be 20 degrees because then you do not need to use double isolation and, of course, the aesthetics and luxury are not lost.