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A low, modular 2x6-decked sectional piece with a slatted seat surface and a solid back, built to combine with matching units into a full sectional.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Base side rails You most likely won't need to cut these full-length boards. | 2 | 1 1/2" × 3 1/2" × 96" | 2x4 | ☐ |
| Base cross members | 4 | 1 1/2" × 3 1/2" × 31 1/4" | 2x4 | ☐ |
| Decking boards You most likely won't need to cut these full-length boards. | 9 | 1 1/2" × 5 1/2" × 96" | 2x6 | ☐ |
| Top cleats | 6 | 1 1/2" × 1 1/2" × 16" | 2x2 | ☐ |
| Back boards | 3 | 1 1/2" × 5 1/2" × 37" | 2x6 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4 board, 96" (Pressure-treated pine or cedar) | 2 each | ☐ |
| 2x4 board, 10 ft (Pressure-treated pine or cedar) | 1 each | ☐ |
| 2x6 board, 96" (Pressure-treated pine or cedar) | 9 each | ☐ |
| 2x6 board, 10 ft (Pressure-treated pine or cedar) | 1 each | ☐ |
| 2x2 board, 96" (Pressure-treated pine or cedar) | 1 each | ☐ |
| Pocket-hole screws, 2-1/2" | 40 each | ☐ |
| Exterior self-tapping screws, 2-1/2" | 20 each | ☐ |
| Wood glue | 6 oz | ☐ |
| Metal L brackets Optional — adds extra security to the open end if not butted against another sectional piece. | 2 each | ☐ |
Overall cost: $$$. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Drill / Driver, Pocket Hole Jig. Materials: 2x4 board, 96", 2x4 board, 10 ft, Pocket-hole screws, 2-1/2", Exterior self-tapping screws, 2-1/2", Wood glue
Build the base frame from the side rails and cross members. Pocket holes (1-1/2" setting, 2-1/2" pocket-hole screws) work well, or you can countersink 2-1/2" self-tapping exterior screws instead. Use glue throughout and check for square as you go.
If you're using pocket holes, consider also drilling a set facing upward now for attaching the decking boards in the next step — it saves you working underneath later.
Tools: Drill / Driver. Materials: 2x6 board, 96", Pocket-hole screws, 2-1/2"
Attach the decking boards starting at the back and working inward, leaving a 1/2" gap between each board.
Tools: Drill / Driver, Pocket Hole Jig. Materials: 2x2 board, 96", Pocket-hole screws, 2-1/2", Wood glue
Attach the 2x2 cleats to the top of the decking using the 1-1/2" pocket-hole setting, 2-1/2" pocket-hole screws, and glue.
Tools: Drill / Driver. Materials: 2x6 board, 10 ft, Pocket-hole screws, 2-1/2", Metal L brackets
Attach the back board to both the 2x2 cleat and the 2x6 decking below it. Then split the remaining distance evenly and attach the center back boards.
We felt this back was plenty sturdy as built, but if you're concerned about the open end of the sectional, add a metal L bracket on the inside for extra security.