Head-to-Head Comparison
| Factor | Pressure-Treated Wood | Composite (Trex/TimberTech) |
|---|---|---|
| Upfront cost | $18–$35/sqft | $30–$75/sqft |
| Annual maintenance | $300–$800/year | $0–$50/year |
| 15-year total (300 sqft) | $15,000–$25,000+ | $12,000–$23,000 |
| Lifespan | 10–15 years | 25–50 years |
| Maintenance | Stain/seal every 1–2 yrs, sand, replace rotted boards | Occasional soap & water wash |
| Splinters | Yes (worsens with age) | Never |
| Warping/cracking | Common after 3–5 years | Rare (capped technology) |
| Mold/rot resistance | Low without annual treatment | High (impervious cap) |
| Color retention | Fades to gray in 1–2 years | Minimal fade, stabilizes at 6 months |
| Resale ROI | 50–65% | 65–80% |
| Warranty | None (labor only) | 25–50 years (manufacturer) |
| Environmental | Chemical treatment, shorter life | Trex = 95% recycled materials |
15-Year Total Cost of Ownership
This is the number that matters. What a 300 sqft deck actually costs over 15 years including maintenance:
| Cost Component | PT Wood | Trex Transcend |
|---|---|---|
| Initial build (300 sqft) | $8,000 | $16,000 |
| Staining/sealing (every 2 yrs × 7) | $4,200 | $0 |
| Board replacement (yr 8–12) | $2,500 | $0 |
| Power washing (annual) | $2,250 | $750 |
| Your time (weekends maintaining) | 100+ hours | ~5 hours |
| 15-Year Total | $16,950 | $16,750 |
At year 15, the wood deck needs full replacement ($8,000+). The composite deck has 10–35 years of life remaining.
Virginia Climate: Why It Matters
Freeze-thaw (Dec–Mar): Wood absorbs water. When it freezes, it expands and cracks. After 50–80 cycles per winter, untreated boards split within 3–4 years. Composite's capped surface prevents moisture entry entirely.
Humidity (Jun–Sep): 70–90% humidity breeds mold and accelerates rot. Annual sealing helps but never fully stops it. Composite resists surface mold.
UV exposure: 200+ sunny days/year. Untreated wood grays within 12 months. Composite uses UV-resistant pigments that stabilize after initial settling.
When Wood Still Makes Sense
- Tight budget (under $10k): If budget is the primary constraint and you need a functional deck now.
- Temporary (under 5 years): Selling soon or planning to replace later.
- Natural wood preference: Some homeowners genuinely prefer real wood and are willing to maintain it. Cedar is better than PT in this case.
Frequently Asked Questions
Is composite cheaper than wood long-term?
Yes. Over 15 years, composite costs $3,000-$5,000 in maintenance vs $8,000-$15,000+ for wood. The upfront premium is recovered within 5-7 years.
How long does composite last vs wood?
Composite: 25-50 years. PT wood: 10-15 years with annual maintenance, 5-8 years without. Cedar: 15-20 years.
Which has better resale value?
Composite recoups 65-80% vs 50-65% for wood. Buyers prefer composite because it signals low maintenance.
Which is better for Virginia?
Composite. Freeze-thaw cycles and humidity accelerate wood deterioration. Capped composites are impervious to moisture.