A roof deck is the flat or sloped surface that forms the top layer of a building's roof. It provides structural support and is typically made from materials like plywood, oriented strand board (OSB), or concrete. The roof deck serves as a base for roofing materials, such as shingles or membranes, and helps protect the building from weather elements. In addition to its structural role, the roof deck can also contribute to energy efficiency and insulation. Properly designed roof decks can support features like green roofs or solar panels, enhancing the building's sustainability. Regular maintenance of the roof deck is essential to prevent leaks and prolong its lifespan.