Introduction
The most expensive part of a decking project is the forgotten item — the second lumberyard trip, the stalled weekend, the stairs you can’t finish because the treads weren’t ordered. This checklist consolidates everything to verify, measure, and order before the build starts. Work through it top to bottom, then run your final numbers through the Decking Board Calculator as the last check before ordering.
Each section links to the guide that explains it in depth — the estimating guide for measuring, the material guide for selection. Print it or keep it on your phone at the lumberyard — every unchecked box is a potential second trip.
1. Verify Before You Measure
- ☐ Frame inspected: joists solid, no rot or major splitting, ledger flashed and secure
- ☐ Joist spacing confirmed (16 in on center standard for 5/4 boards — verify against your board’s span rating)
- ☐ Permit question answered with the local building authority (exempt? permit? inspections?)
- ☐ HOA / zoning checked if the footprint changes
- ☐ Structural doubts resolved — pro or engineer consulted if anything is questionable (see DIY vs pro)
2. Measure and Calculate
- ☐ Deck length and width measured outside-edge to outside-edge of rim joists, both ends
- ☐ Irregular areas split into rectangles; each estimated separately
- ☐ Board material chosen; actual board width and required gap confirmed from the product spec
- ☐ Board direction decided (which way boards run) — it determines which deck dimension is the “width” in the row formula
- ☐ Board length chosen; butt-joint stagger planned if lengths don’t divide evenly
- ☐ Field board count calculated (rows × boards per row)
- ☐ Waste band set by layout: 5–10% simple rectangle · 10% with joints · 10–15% diagonal/border · 15–20% complex
- ☐ Final order quantity = geometric count × (1 + waste%), rounded up — plus 1–2 extra boards for culls
- ☐ Area cross-check done: deck area ÷ coverage per board ≈ row count (±1)
3. Boards and Trim
- ☐ Field boards: quantity, length, species/product ordered (single production lot for composite)
- ☐ Picture-frame border boards (if planned): perimeter pieces + miter waste
- ☐ Fascia boards: perimeter ÷ board length, in the fascia width
- ☐ Stair treads: steps × 2 boards × stair width, rounded up per step
- ☐ Stair riser boards (if closing risers)
- ☐ Ledger-board cover trim, if the ledger face will show
- ☐ Delivery arranged — and an acclimation window (3–7 days stickered on site for PT lumber) planned before install day
4. Fasteners and Accessories
- ☐ Screws: 2 per joist crossing — count = rows × joists × 2 (buy the next box size up)
- ☐ Screw type matched to material: coated for PT · stainless/coated for cedar/redwood · manufacturer clips for composite/PVC
- ☐ Hidden-clip system (if composite/PVC): clips + start/finish fasteners per the manufacturer’s spec
- ☐ End-cut preservative for field-cut PT ends
- ☐ Gap spacers (16d nails or manufactured spacers) for consistent 1/4-in gaps
5. Finish and Protection
- ☐ Stain/sealer for wood decks: ~1 gallon per 100–150 ft² per coat × 2 coats (192 ft² ≈ 2–3 gallons)
- ☐ Applicators: pad applicator or brush, plus a small brush for cut ends and edges
- ☐ Cleaner/brightener if refinishing weathered wood before staining
- ☐ 48 hours of dry weather forecast confirmed for staining days
6. Tools
- ☐ Saw: miter saw (preferred) or circular saw with straightedge
- ☐ Impact driver + drill, with spare batteries and correct driver bits
- ☐ Tape measure, chalk line, speed square, 4-ft level
- ☐ Sawhorses and clamps
- ☐ Safety: eye protection, hearing protection, dust mask, gloves
- ☐ Pry bar / demolition tools if removing old decking; disposal plan (dumpster, haul-away, or municipal pickup)
7. Day-Before Checks
The final walkthrough happens the evening before install day — not the morning of, when the lumberyard is closed and the crew (or your weekend) is waiting:
- ☐ Boards acclimated and sorted by width; worst boards set aside for rips and short pieces
- ☐ Joist tops checked — add protective joist tape if planned (cheap insurance under the gaps)
- ☐ Starting edge chosen (house side / most visible edge first)
- ☐ Inspection scheduled if the permit requires one before covering work
- ☐ Manufacturer installation instructions on site (required reference for composite/PVC — see code compliance)
- ☐ Weather window: no rain for install days; dry 48-hour window reserved for finishing
Reference: The 16 × 12 Order at a Glance
For the canonical 16 ft × 12 ft deck (192 ft² / 17.84 m²) — 5/4×6 PT, 1/4-in gap, 16-ft boards, 10% waste:
| Item | Quantity |
|---|---|
| 5/4×6×16 PT deck boards | 29 |
| Coated deck screws, 2½ in | 1,000-count box |
| End-cut preservative | 1 container |
| Deck stain/sealer | 2–3 gallons |
| Linear footage (for pricing) | 464 lin ft (141.4 lin m) |
Related Guides
- Decking Board Calculator FAQ — quick answers to ordering questions.
- Pro Tips — selection, acclimation, and installation technique.
- Common Mistakes — what the checklist is designed to prevent.
- Code Compliance — permits and inspections.
- DIY vs Pro — the build-decision framework.
- Case Study — a fully worked illustrative order.
Frequently Asked Questions
What do people most often forget to order?
Stair treads, fascia, and end-cut preservative — the field boards get estimated carefully and everything else gets assumed. Estimate all four line items separately.
How far ahead should I schedule delivery?
Order 1–2 weeks ahead in building season, and plan the delivery 3–7 days before install day so PT lumber can acclimate stickered on site. Confirm the yard has your full quantity in one stock before you schedule around it.
Should I order extra beyond the waste allowance?
One to two boards beyond the calculated waste is cheap insurance for culls. Unused boards are returnable; a stalled project is not.
Get Your Number
Checklists only work if the numbers on them are right. Verify every section above, then run the final dimensions through the Decking Board Calculator one last time — rows, boards per row, waste, rounding — and place the order with confidence. The goal is one delivery, zero return trips.
Disclaimer: Calculator results are planning estimates based on the dimensions you enter. Actual board requirements vary with board dimensions, site conditions, and cutting waste. Verify quantities with your supplier and consult a licensed professional or your local building authority for structural or code-related decisions.
