Pressure-Treated Pine 3.5" x 8' (Narrow)
Narrow-width pressure-treated decking boards for decorative patterns and accent applications. The 3.5-inch width works well for herringbone and diagonal patterns where narrower boards create a more intricate visual effect. Also used for stair treads and trim details.
Pros and Cons
Advantages
- Ideal for decorative patterns
- Lower cost per board
- Works well for stair treads
- Easy to handle and cut
- Creates detailed visual patterns
Considerations
- More boards needed to cover area
- More fasteners and labor required
- More gaps between boards
- Same maintenance as standard PT
- Limited to pattern and accent use
Cost Estimates by Deck Size
The table below shows pre-computed material costs for five standard deck sizes using Pressure-Treated Pine 3.5" x 8' (Narrow). All estimates include structural framing (joists, beams, posts), concrete footings, fasteners, hardware, railing on three sides, and one set of stairs. The board cost column shows the cost of decking boards alone, while the total includes all materials needed for a complete deck.
| Deck Size | Area | Boards | Board Cost | Total Materials |
|---|---|---|---|---|
| 10' x 12' Deck | 120 sq ft | 55 | $528 | $3,429 |
| 12' x 16' Deck | 192 sq ft | 88 | $845 | $4,378 |
| 14' x 20' Deck | 280 sq ft | 128 | $1,229 | $6,450 |
| 16' x 24' Deck | 384 sq ft | 175 | $1,680 | $7,505 |
| 20' x 20' Deck | 400 sq ft | 183 | $1,757 | $8,289 |
Material Comparison for a 12' x 16' Deck
How does Pressure-Treated Pine 3.5" x 8' (Narrow) compare to other decking materials? The following table shows total material costs for a standard 12' x 16' deck (192 sq ft) across multiple decking options. This comparison includes identical framing and hardware for each option; only the surface decking boards differ.
| Decking Material | Price/LF | Board Cost | Total Materials |
|---|---|---|---|
| Pressure-Treated Pine 3.5" x 8' (Narrow) | $1/lf | $845 | $4,378 |
| Pressure-Treated Pine 5.5" x 12' | $2/lf | $912 | $4,335 |
| Composite Decking 5.5" x 12' | $5/lf | $2,052 | $5,475 |
| Western Red Cedar 5.5" x 12' | $5/lf | $2,052 | $5,475 |
| Redwood Decking 5.5" x 12' | $8/lf | $3,648 | $7,071 |
| Ipe Hardwood 5.5" x 12' | $9/lf | $4,104 | $7,527 |
| PVC Decking 5.5" x 12' | $6/lf | $2,736 | $6,159 |
Maintenance and Lifespan
Expected lifespan: 15-20 years with proper maintenance. The actual service life depends on your climate zone, sun exposure, proximity to water, and how diligently maintenance is performed. Decks in the Pacific Northwest that receive heavy rainfall will weather differently than decks in the arid Southwest, and maintenance schedules should be adjusted accordingly.
Maintenance requirements: Annual cleaning, sealing, and staining. Inspect for loose boards and popped fasteners each spring. Replace individual boards as they deteriorate. Power wash every 1-2 years before reapplying finish.
Estimated annual maintenance cost: $150-300 per year for a typical deck (sealer, stain, cleaning supplies). Over a 20-year period, these annual costs accumulate and should be factored into your total cost of ownership calculation. A material with a higher purchase price but lower maintenance may actually cost less over the deck's full lifespan.
Proper installation is the single most important factor in deck longevity regardless of material choice. Ensure adequate ventilation beneath the deck surface (minimum 18 inches of clearance for ground-level decks), proper drainage away from the structure, and correct fastener selection for the specific decking material. Using the wrong fastener type or spacing can void manufacturer warranties and lead to premature board failure.
Installation Tips for Pressure-Treated Pine
Allow pressure-treated lumber to acclimatize for at least 2-3 weeks before installation, especially if the boards arrive wet from the treatment process. Stack boards with spacer sticks between each layer in a covered, well-ventilated area. Wet boards installed immediately will shrink as they dry, opening gaps between boards that are wider than intended. Pre-drill near board ends to prevent splitting, and use corrosion-resistant screws rated for ACQ-treated lumber (standard galvanized fasteners can corrode from the copper compounds in the treatment). Leave 1/8-inch gaps between boards for drainage and a 1/4-inch gap at walls and posts for expansion.
Other Pressure-Treated Pine Options
Looking for a different size or configuration in pressure-treated pine decking? The following options are available in the same material:
Frequently Asked Questions
How much does Pressure-Treated Pine 3.5" x 8' (Narrow) cost for a 12x16 deck?
Using Pressure-Treated Pine 3.5" x 8' (Narrow) for a 12' x 16' deck (192 sq ft), the total material cost including framing, hardware, railing, and stairs is approximately $4,378. The decking boards alone account for $845 of that total. Adding professional installation at $25/sq ft would bring the complete project cost to approximately $9,178.
How long does pressure-treated pine decking last?
Pressure-Treated Pine decking typically lasts 15-20 years with proper maintenance. Annual cleaning, sealing, and staining. Inspect for loose boards and popped fasteners each spring. Annual maintenance costs are estimated at $150-300 per year for a typical deck (sealer, stain, cleaning supplies). The actual lifespan depends on your climate, the quality of installation, and how consistently maintenance is performed.
Is pressure-treated pine a good choice for decking?
Pressure-Treated Pine is the most popular and affordable decking choice, ideal for budget-conscious projects. Key advantages include ideal for decorative patterns, lower cost per board, works well for stair treads. The main considerations are more boards needed to cover area and more fasteners and labor required. Your decision should factor in both upfront cost and long-term maintenance requirements.