This rugged outdoor bench will also keep the snow and rain off your stash of wood for your fireplace or outdoor fire pit.
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Cut the legs (A), slats (B), and feet (F) to length (Project Diagram, Cutting List, and Cutting Diagram). Round over the cut ends of the legs, slats, and feet with a sander and 100-grit sandpaper so these edges match the factory edges. Set the feet aside for use later.
When cutting or sanding pressure-treated wood, wear breathing and eye protection, and wash your hands thoroughly afterward. Never burn treated-wood scraps -- discard them with your trash.
Lay a slat (B) on your workbench with the best face down and position a leg (A) against one end so the top end of the leg and the top surface of the slat are even. (Work with the parts upside down for now.) Drill three 3/16-inch pilot holes through the leg and into the slat. Extend the holes into the slat to suit the length of the screws. Drive 4-1/2-inch structural wood screws (Project Diagram, Drawing 1). Add a second leg to the other end of the slat. Repeat to make another slat/leg assembly.
As you assemble the parts, orient the best faces and edges to the outside.
Turn a legs/ slat assembly right side up. Insert a lower slat (B) between the legs (A), using two feet (F) as spacers to elevate the lower slat. Drill pilot holes and drive the structural wood screws (Project Diagram, Drawing 1). Repeat for the second sides/slat assembly.
Cut the rails (C), leg fillers (D), and seat supports (E) to length (Project Diagram, Cutting List, and Cutting Diagram). Round over the ends of the rails and leg fillers with a sander so these edges match the factory edges.
Using a circular saw or a jigsaw, cut one of the rails (C) to 3 inches wide (Project Diagram, Drawing 2).
Lay one bench frame on your workbench with the inside edges up. Apply a bead of exterior wood glue centered along the edges of the legs and slats. Place the rails (C) and leg fillers (D) in position (Project Diagram, Drawing 2) flush with the outer surfaces of the bench frame at the top edge and ends. Drill 1/8-inch pilot holes and drive 2-1/2-inch deck screws.
With the bench frame/center frame assembly (A/B/C/D/E) and second bench frame (A/B) upside down on your workbench, apply glue to the inside edges of the second bench frame and clamp the halves of the bench together (Project Diagram, Drawing 3). Working from the bench frame/center frame assembly side, drill angled pilot holes through the rails (C) and into the slats (B) of the second seat frame. Drive 2-1/2-inch deck screws. (Project Diagram, Drawing 4).
Cut the seat supports (E) to length (Project Diagram, Cutting List and Cutting Diagram). Retrieve the feet (F).
Apply glue to one edge of each seat support. Position them on the bottom faces of the upper seats (B), 1 inch in from the outside edges (Project Diagram, Drawing 1, and Drawing 4). Drill pilot holes and drive 2-1/2-inch deck screws.
Drill pilot holes near the corners of the feet. Apply glue and position the feet on the bottom faces of the lower slats (B) in the corners formed by the legs (A) and rail (C). Drive 2-1/2-inch deck screws (Project Diagram, Drawing 3).
Inspect the bench and sand any rough spots. Also, sand away any visible mill marks.
Always wear eye and breathing protection when sanding pressure-treated wood.