Step 3: Mark the Angle

marking an angle onto a board with a straightedge
Photo: Matthew Benson
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The top board of each side needs to be tapered. To get that angle, run a straightedge diagonally from the top corner of one end of a board to the bottom corner of the other end, and mark the line, as shown.
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    Tools List

    • miter saw
      miter saw
    • jigsaw
      jigsaw
    • drill
      drill/driver
    • straightedge guide
      straightedge
    • hand clamps
      clamps
    • caulk gun
      caulk gun
    • metal garden rake
      garden rake
    • garden spade
      garden spade

    Shopping List

    [1. 5/4x6 decking by Cambia Get at least three 8-foot boards.

    2. salvaged window sash pavers Get enough to set beneath each side of the frame.

    3. construction adhesive

    4. 1-inch deck screws 5. 2½-inch deck screws

    6. brass sash pull

    7. 4-inch galvanized strap hinges Get two to attach the window to the frame.

    8. 4-inch removable-pin hinges Get one for the inside of each corner to make the frame collapsible.

    9. ½-inch dowel Get at least 6 feet to make venting poles of various lengths.]