Step 7: Water Well

watering the green roof
Photo: Alison Rosa
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Once the trays are installed, they are watered to settle the soil. Green roof plants like these sedums usually don't require irrigation unless there's a four-week spell of high heat with less than 1 inch of rainfall. During dry spells, the growing medium can shrink, leaving it vulnerable to weeds. Sarah and Scott can irrigate this roof with a self-coiling garden hose threaded into the second-floor-bathroom sink faucet. Then a yearly haircut—and occasional fertilizer as indicated by a soil test—is all that's needed to keep the green roof fit and trim.
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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