I want to convert my loft and need to span 9 meters unsupported. Can it be achieved without steel beams?
I just checked some Ontario tables. For an Attic, not accessible by stairs (i.e. not used as living space, a 2x12 every 12" can span 32 ft. But you can't put anything above it.
I've found nothing in the tables that allows a 30 ft span supporting a floor.
While this doesn't mean it can't be done, it means you need to consult with an engineer, and pay for a proper design.