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A two-frame, 8-foot, 24"-deep shelving rack where the lumber math does the work: full boards uncut, 12-footers halved, plywood ripped once. Minimal cuts, maximum shelf.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Legs The 12-footers, halved exactly. | 4 | 1 1/2" × 3 1/2" × 72" | — | ☐ |
| Long supports Full 8-foot boards — square the factory ends and go. | 8 | 1 1/2" × 3 1/2" × 96" | — | ☐ |
| Crosspieces | 12 | 1 1/2" × 3 1/2" × 21" | — | ☐ |
| Shelf decks Two sheets ripped in half lengthwise. | 4 | 1/2" × 24" × 96" | Plywood | ☐ |
| Center supports Optional — for heavy loads; 2–6 as needed. | 6 | 3/4" × 3 1/2" × 72" | 1x4 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4, 8 ft Eight used FULL LENGTH as long supports (check ends for square); three cut into the 21" pieces. | 11 each | ☐ |
| 2x4, 12 ft Cut exactly in half — the four 72" legs. | 2 each | ☐ |
| Plywood, 1/2", 4x8 sheet Each ripped in half lengthwise — four 24" x 96" shelf decks. | 2 each | ☐ |
| Self-tapping screws, #10 x 3", star drive | 100 each | ☐ |
| Self-tapping screws, #8 x 1-3/4", star drive Plywood decks. | 40 each | ☐ |
| 1x4, 6 ft Optional center supports for heavy loads — up to six. | 2 each | ☐ |
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, 8 ft, 2x4, 12 ft, Self-tapping screws, #10 x 3", star drive
On a flat surface, mark the shelf-level joints on the legs — remember each long support is 3-1/2" tall, so mark the BOTTOM of each board's position. Lay out two legs with four 96" supports and screw together with 3" screws, everything flush at the back face.
Build the second frame ON TOP of the first, matching it joint for joint — two identical frames, guaranteed.
Tools: Drill / Driver. Materials: 2x4, 8 ft, Self-tapping screws, #10 x 3", star drive
Stand the frames 21" apart and connect them with the crosspieces at every shelf level — two screws per joint, plus extra screws reinforcing the corner joints into the long supports. The tower will feel wobbly here; that's the plywood's job to fix, not yours.
Tools: Drill / Driver. Materials: Plywood, 1/2", 4x8 sheet, Self-tapping screws, #8 x 1-3/4", star drive
Lay each 24" x 96" plywood deck on its level and screw down with 1-3/4" screws — but first, rack the frame until the plywood's factory corners sit flush at all four frame corners. The sheet is the truest rectangle in the garage; let it square the unit as you fasten.
The wobble disappears with the first deck. That's shear panels doing what shear panels do.
Tools: Drill / Driver. Materials: Self-tapping screws, #10 x 3", star drive, Self-tapping screws, #8 x 1-3/4", star drive, 1x4, 6 ft
Storing real weight (tools, fluids, boxed books)? Screw 1x4s under the shelf centers as shown — halving the span quadruples the stiffness.
Then anchor the unit to wall studs through the back legs. Six feet of loaded shelving must not be capable of tipping; this is the two-minute step that makes everything above it safe.