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Modular heavy-duty garage shelving: build one ladder-style leg support per ~4 feet of run, span them with 2x4 shelf boards, and anchor to the wall. Any length, same two steps.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Uprights (per leg support) Multiply by the number of supports — one support per ~4 ft of run. | 2 | 1 1/2" × 3 1/2" × 72" | — | ☐ |
| Rungs / shelf supports (per leg support) One per shelf level; four gives four shelves. | 4 | 1 1/2" × 3 1/2" × 17" | — | ☐ |
| Shelf boards (per shelf) Cut to your run length — the source build ran 20-footers. | 4 | 1 1/2" × 3 1/2" × 96" | — | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4, 10 ft Two per leg support — a 3-support unit needs 6. Scale up per the design: one support per ~4 ft of shelf run. | 6 each | ☐ |
| 2x4, 8 ft Four per shelf level: an 8-foot, 4-shelf unit uses 16. Buy longer boards for longer runs. | 16 each | ☐ |
| Self-tapping wood screws, #9 x 2-1/2", star drive Two per leg per shelf board. | 100 each | ☐ |
| Wood screws for wall anchoring, #10 x 3" Through the back uprights into studs. Not optional on a tall loaded rack. | 6 each | ☐ |
| Wood glue | 8 oz | ☐ |
Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Drill / Driver, Pencil, Speed Square, Tape Measure. Materials: 2x4, 10 ft, 2x4, 8 ft, Self-tapping wood screws, #9 x 2-1/2", star drive, Wood glue
Mark the rung positions identically on every upright — a story stick (one upright marked, then used to transfer to all the others) beats measuring each and guarantees level shelves. Glue and screw the four 17" rungs between pairs of uprights with 2-1/2" screws.
Build one support per roughly four feet of shelf run. Sag in a 2x4 shelf is set by support spacing, not board strength — closer supports for paint cans and totes, wider is fine for light bins.
Tools: Drill / Driver, Pencil, Tape Measure. Materials: 2x4, 8 ft, Self-tapping wood screws, #9 x 2-1/2", star drive, Wood screws for wall anchoring, #10 x 3"
Mark the leg-support positions on four shelf boards. Screw two boards to the TOP shelf level and two to the BOTTOM first, outer boards flush with the inside of the uprights — that skeleton establishes the unit's shape while it's still light enough to adjust. Square it (match the diagonals), then fill in the remaining shelf boards, two screws per leg per board.
Last and most important: screw through the back uprights into wall studs with the 3" screws. A loaded rack this tall must not be able to tip — anchoring is the difference between shelving and a hazard with shelves on it.