installing the backrest's center support
Photo: Kolin Smith

Step 10: Secure the Center Support

Cut a 30-degree miter off one end of a reinforcement block, per the cut list. Attach it to the seat base's middle stringer, long edge facing upward, using 2-inch screws. Slide the backrest's center support into the gap between the reinforcement block and the back of the seat base, as shown, until the bottom is flush with the underside of the middle stringer. Secure it by driving 2-inch screws through the support and into the stringer.
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    Tools List

    • sledge hammer
    • miter saw
      miter saw
    • jigsaw
    • drill
      drill/driver and 1-inch paddle bit
    • caulk gun
      caulk gun
    • four-foot level
      4-foot level
    • hand clamps
    • combination square
      combination square
    • flexible curves
      flexible curve to draw profile for rafter tails

    Shopping List

    All lumber listed is western red cedar.

    2x4s Get twelve 8-foor boards.

    1x4s Get at least four 8-foot boards.

    1x2s Get at least nine 8-foot boards. 2x6s Get three 8-foot boards.

    2x2s Get two 8-foot boards or five 4-foot spindles for the purlins.

    ¼-inch spacers cut from scrap.

    Post anchors Get four.

    Construction adhesive

    Stainless-steel trim-head screws You need three sizes: 1¼ inch, 2 inch, and 3 inch.