Can the top floor be opened in the beam?

A hole of 1 1 cm will definitely break the steel bar, and it is generally forbidden to make holes in Liangshan.

After all, the beam of the house is a load-bearing whole, and no one can guarantee what will happen in the future.

Besides, there are many ways to solve the house problem. As long as you think about it, there must be another solution. If not, find a reliable master to design it.