Step 3: Connect the Trays

connecting planted trays on the roof using a modular plastic lip system
Photo: Alison Rosa
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With a modular system like the one used here, any tray can be removed from the roof for maintenance without disturbing the others. In this system, plastic lips on the front and right sides overlap the left and back sides of neighboring trays for stability, creating a blanket that eliminates seams and reduces temperature fluctuations. Feet built into the underside of the trays keep them elevated ½ inch above the roof's surface so that runoff can easily flow underneath toward the gutters.
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    Tools List

    • 16-foot tape measure
      Tape measure
    • drill
      Drill/driver
    • concrete saw
      Concrete saw with masonry blade

    Shopping List

    1. EPDM

    2. Modules

    3. Engineered soil

    4. Sedums

    5. Aluminum edging