Step 4: Install the second bracket

installing the second bracket of a window box
Photo: Mary Beth Montgomery
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Hold the second bracket in position under the window-sill, lining it up with the window frame.

Lay a 4-foot level across the two brackets; raise or lower the second bracket until the two are level.

Drill a pilot hole and counterbore into the bracket near the bottom of the siding as in Step 2.

Attach the bracket to the house with a 3-inch decking screw, then follow the directions in Step 3 for plumbing the bracket and driving the second screw.
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    Tools List

    • drill
      Cordless drill with Phillips tip
    • four-foot level
      4-foot level
    • two-foot level
      2-foot level
    • 16-foot tape measure
      Tape measure
    • Countersink bit
      Combination countersink/counterbore bit

    Shopping List

    1. WINDOW BOX

    2. TWO WINDOW BOX BRACKETS

    window boxes longer than 48 inches need a third, center bracket



    3. 2 1/2-INCH DECKING SCREWS

    4. 3-INCH DECKING SCREWS

    5. CONTAINER SOIL

    6. PAINT OR STAIN

    7. FLOWERS AND PLANTS