What type of deck has timber planks positioned with the wide face of the plank in the vertical position?

A timber deck with planks positioned with the wide face of the plank in the vertical position is known as a nail laminated deck. This type of deck utilizes the strength of the timber by placing the wide side vertically, which allows for better load distribution and structural integrity. The vertical orientation of the timber planks provides greater resistance against bending and enhances the overall durability of the deck.

Nail laminated decks are typically created by nailing together layers of timber planks to form a solid, composite structure. This method has been widely used in bridge construction, particularly in applications where a lightweight yet robust deck is essential.

The other types mentioned do not align with this description. For instance, a plan deck typically refers to a deck where planks are installed with their smaller face up, which does not provide the same structural benefits as a nail laminated deck. Stress laminated decks involve laminating the members under compressive forces but do not necessarily specify the orientation of the planks in the same way. A concrete deck, meanwhile, is composed primarily of cast concrete, diverging entirely from the timber context. Understanding these distinctions helps clarify why the nail laminated deck is the correct choice for the given description.