Green roofs have become increasingly popular in recent years, with rooftop plantings reducing energy costs, improving air quality, increasing biodiversity and reducing storm water runoff. One of the easiest methods to create an instant green roof is to use plastic planter trays pre-filled with growing medium and plants. We recommend using a modular tray system. In many cases, there may be a need to elevate the planter trays to cover service pipes, electrical conduits and surface irregularities, to raise the plantings to match the height of paved areas, or to correct for the slope on the rooftop. Fiberglass grating panels supported by adjustable height pedestals undoubtedly offer the most effective and versatile means of supporting raised planter trays.