I took the above picture at the Jerusalem Old Train Station yesterday. There are no trains anymore but the entire place serves as a cultural center. Cafes, restaurants, exhibition halls and lots of events such as movies and concerts.
Now during Sukkot, most restaurants have their own Sukkah outside. When you take a look at the above photo, you may get the impression that the Sukkah roofs are covered by another gigantic roof. This is not the case, as the huge plastic roof has also huge open spaces and doesn’t cover everything.
So, the roofs (S’chach) of the Sukkot (booths) underneath are kosher. A Sukkah, and especially the S’chach (roof), have to be build according to halachic rules. The Sukkah has to be kosher. For instance, for S’chach we only use material such as vegetation, or what is detached to the ground or incapable of becoming tame’i (impure). The Sukkah must have at least three walls and be of a certain size and height. And, as I have already said, the roof cannot be covered by a balcony or a second roof.