Simple Modern Outdoor Sectional

Assemble the seat frame from the long and short 2x4s, two 2-1/2" self-tapping screws per joint and exterior glue. Check it square — every later part references this frame.

Fasten the front and back legs to the frame from the inside, two screws per joint plus glue. The taller back legs form the backrest posts.

Screw the top rail across the back legs with 2-1/2" screws — this sets the backrest and stiffens the whole piece.

Place the two outer slats and the center slat first and screw them down, two screws per joint, then space the remaining slats evenly between them and fasten. Even gaps drain rain and let the cushions breathe.

Fasten the 2x2 trim to the seat slats and into the legs where you can reach, to finish off the end of the seat and cover the slat ends.

Build the corner piece, watching which side the seat apron lands on — the corner works on either hand depending on how your sectional wraps, so set your layout first. Attach the corner to a seat module's legs with 2-1/2" screws. Sand all edges, seal or let it silver, and size cushions to the finished frames.