There is an opinion, even among professional builders, that wooden structures can be used either on very small spans of 4-5 meters, or already used in unique objects and some completely non-standard solutions, for example, if you need to cover a swimming pool, sports hall, exhibition area. And in that case we use bulky, heavy and expensive bent-glued structures. But the span interval from 6 to 12 meters is given to other materials -metal or...