Which of the following is NOT an element of vegetated roof systems?

• A. Deck Layer
• B. Growing Media
• C. Plant Cover
• D. Stormwater Filter

Answer: (D)

Vegetated roof systems are built as layered assemblies that support plant life while managing water at the roof level. The essential components include a deck layer that provides the structural base, a growing media or substrate that feeds the plants and stores water, and the plant cover that forms the vegetation and uses water through evapotranspiration. A stormwater filter is not a standard part of the green roof itself; filtration devices are used in other parts of a drainage or stormwater treatment system, not as a layer within the roof’s vegetated assembly. Therefore, the stormwater filter is not an element of vegetated roof systems. The deck layer, growing media, and plant cover are integral to how a green roof functions and helps manage stormwater.