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A modular 2x4 patio sofa — build one armless seat at a time, add corner pieces, and grow it to fit your space. All exterior screws, no fancy joinery.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Seat frame, long | 2 | 1 1/2" × 3 1/2" × 24" | 2x4 | ☐ |
| Seat frame, short | 2 | 1 1/2" × 3 1/2" × 22" | 2x4 | ☐ |
| Front legs | 2 | 1 1/2" × 3 1/2" × 13 1/2" | 2x4 | ☐ |
| Back legs | 2 | 1 1/2" × 3 1/2" × 27 1/2" | 2x4 | ☐ |
| Back top rail | 1 | 1 1/2" × 3 1/2" × 25" | 2x4 | ☐ |
| Seat slats Spaced evenly so rain drains and cushions breathe. | 7 | 1 1/2" × 3 1/2" × 22" | 2x4 | ☐ |
| Seat trim | 2 | 1 1/2" × 1 1/2" × 25" | 2x2 | ☐ |
| Corner legs | 2 | 1 1/2" × 3 1/2" × 27 1/2" | 2x4 | ☐ |
| Corner top | 1 | 1 1/2" × 3 1/2" × 28 1/2" | 2x4 | ☐ |
| Corner seat and apron | 2 | 1 1/2" × 3 1/2" × 23 1/2" | 2x4 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4 board, 8 ft (Cedar or treated pine) Per armless seat. Exterior-suitable wood. | 3 each | ☐ |
| 2x2 board, 50" (Cedar or treated pine) Seat trim. | 1 each | ☐ |
| 2x4 board, 8 ft (corner) (Cedar or treated pine) Plus a 4 ft length for the corner piece. | 1 each | ☐ |
| Exterior self-tapping wood screws, 2-1/2" ~65 per seat, ~15 per corner. | 80 each | ☐ |
| Waterproof wood glue | 6 oz | ☐ |
| Exterior stain or sealer Or leave cedar to silver. | 24 oz | ☐ |
| Outdoor seat and back cushions Sized after the frames are built. | 2 each | ☐ |
Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.