Final answer:
In roofing construction, plywood, concrete, and metal are common materials for roof decks. Asphalt shingles are used as a top covering and not as the structural deck, making them the least likely to be used as a roof deck material.
Step-by-step explanation:
When considering the materials used for roof decks, we should understand the properties of each material and how they contribute to the overall structure of a roof. A roof deck is the foundation upon which the roofing materials, such as shingles or metal roofing, are laid. The most common materials used for roof decks include plywood, concrete, and metal, each having its unique attributes that make them suitable for different types of roofs.
Plywood is known for its strength and is commonly used in residential construction. Concrete is highly durable and often used in commercial buildings where a heavier and more robust deck is required. Metal decking provides a strong, lightweight, and durable platform for roofs, especially in industrial settings.
However, asphalt shingles are not generally used as a roof deck material but instead as a top covering for the roof. They are designed to overlay a solid deck made of materials like plywood or metal. Thus, asphalt shingles would be the least likely choice for a roof deck material among the options provided.