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Notched-stringer stairs sized by a rise/run calculation, not a fixed cut list — this plan walks the math on a worked two-step example.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Stringers Length is generous stock to notch from — mark and cut your rise/run pattern per your own calculated numbers, not this length directly. | 2 | 1 1/2" × 11 1/4" × 30" | 2x12 | ☐ |
| Ledger / back board Set stair width to 36" here; adjust to your own opening. | 1 | 1 1/2" × 5 1/2" × 36" | 2x6 | ☐ |
| Tread boards Two boards per tread for a two-step run, laid side by side with a small gap. | 4 | 1 1/2" × 5 1/2" × 36" | 2x6 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x12 board, 8 ft (Pressure-treated pine) Stringers. Use 2x10 or 2x8 instead if your rise/run cuts leave enough solid wood below the notches — 2x12 gives the most margin. | 2 each | ☐ |
| 2x6 board, 8 ft (Pressure-treated pine) One board for the ledger/back board, two for tread boards (two boards per tread, side by side, gives an 11" tread depth with a little nosing). | 3 each | ☐ |
| Deck screws, 3" | 30 each | ☐ |
Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.