What is a characteristic of plank-and-beam construction?

Plank-and-beam construction is characterized by its use of large, heavy wooden beams that support flooring made from thick planks. The planks are often tongue-and-groove, which enhances strength and stability by allowing the edges of the planks to interlock securely. This method of construction enables greater spans without needing supporting walls, making for open and flexible interior spaces. The thickness of at least 2 inches ensures durability and the ability to support significant loads, which is a hallmark of this type of construction. In contrast, the other characteristics listed do not align with the defining features of plank-and-beam architecture.