Key Takeaways:
- Composite costs 2–3x more upfront but saves $4,000–$6,000 in maintenance over 20 years
- Pressure-treated wood is the cheapest at $2–$5/sq ft but needs annual staining
- Composite lasts 25–50 years vs wood's 15–20 years in Canadian climates
- Wood wins on natural feel and initial cost — composite wins on lifetime value and zero maintenance
- For cottage properties, composite is the clear choice — you're not there to maintain wood
The Real Cost: Upfront vs Lifetime
The upfront price difference between composite decking and pressure-treated wood is significant — but it tells only half the story.
Upfront Cost (300 sq ft deck, installed)
| Component | PT Wood | Composite (mid-range) |
|---|---|---|
| Deck boards | $600–$1,500 | $2,700–$4,200 |
| Substructure (PT) | $800–$1,200 | $800–$1,200 |
| Fasteners | $100–$200 | $300–$500 |
| Railings | $1,500–$3,000 | $2,500–$5,000 |
| Labour | $3,600–$6,000 | $5,400–$7,500 |
| Total | $6,600–$11,900 | $11,700–$18,400 |
20-Year Total Cost of Ownership
| Cost Factor | PT Wood | Composite |
|---|---|---|
| Initial build | $9,000 | $15,000 |
| Stain/seal (annual) | $6,000 ($300/yr × 20) | $0 |
| Board replacement (year 10) | $1,500 | $0 |
| Cleaning supplies | $400 | $200 |
| 20-year total | $16,900 | $15,200 |
Over 20 years, composite is actually $1,700 cheaper than wood when you include maintenance. The breakeven point is typically year 8–10.
Performance in Canadian Winters
This is where the comparison gets decisive. Canada's 100+ annual freeze-thaw cycles (in Ontario, Quebec, and the Prairies) are the #1 destroyer of wood decks.
How Freeze-Thaw Damages Wood
Water soaks into wood grain → freezes → expands 9% in volume → cracks the wood fibres from inside. After 3–5 Canadian winters, PT wood boards develop:
- Checking (surface cracks along the grain)
- Raised grain (rough, splintery surface)
- Cupping (boards curl upward at edges)
- Warping (boards twist or bow)
Why Composite Resists Freeze-Thaw
Composite's polymer cap creates a moisture barrier that prevents water from entering the board. No moisture absorption = no freeze-thaw expansion = no cracking. A 10-year-old composite deck in Toronto or Montreal looks essentially the same as the day it was installed.
Exception: early-generation composite (pre-2010) without full capping did absorb moisture and experienced similar problems. Modern capped composite from brands like Trex, TimberTech, and Fiberon has resolved this completely.
Aesthetics and Feel
This is wood's strongest argument. No synthetic material perfectly replicates:
- The warmth of real wood underfoot on a summer morning
- The aroma of fresh Western Red Cedar from BC forests
- The character of natural grain patterns — every board is unique
- The aging — weathered wood develops a silver patina that many homeowners love
Modern composite has closed the visual gap significantly — Trex Transcend Lineage and TimberTech Vintage are difficult to distinguish from real wood in photographs. But pick up a board in-store and the difference is immediately apparent. Composite feels denser, smoother, and distinctly synthetic.
Environmental Comparison
| Factor | PT Wood | Composite |
|---|---|---|
| Raw materials | Harvested timber (renewable) | 95% recycled wood + plastic |
| Chemical treatment | ACQ preservatives enter soil | No chemicals |
| End of life | Treated wood = hazardous waste | Recyclable through manufacturer programs |
| Manufacturing energy | Low (milling only) | Higher (extrusion + capping) |
| Maintenance chemicals | Stain, sealer, brightener annually | None |
| Overall | Moderate | Better (recycled content offsets manufacturing) |
Cedar decking is the most environmentally friendly option if you prefer natural wood — it requires no chemical treatment and is biodegradable at end of life.
Which Should You Choose?
Choose Wood If:
- Budget is your primary constraint — nothing costs less per square foot
- You're building a large deck (500+ sq ft) where material savings are substantial
- You enjoy DIY maintenance — weekend staining can be satisfying
- You want to change stain colours every few years
- You value authentic natural aesthetics above all else
Choose Composite If:
- You want zero annual maintenance — no staining, sealing, or sanding ever
- You're building at a cottage or vacation property you can't maintain regularly
- You're optimizing for total cost over 15+ years
- You're in a harsh freeze-thaw climate (Toronto, Ottawa, Montreal, Winnipeg)
- You plan to sell the home within 5–10 years — composite adds more resale value
Frequently Asked Questions
Can you stain composite decking?
No. Composite boards have a factory-applied polymer cap that IS the finish. Stain cannot penetrate the cap. If you want to change colour, you must replace the boards. This is a significant disadvantage if you like to refresh your deck's look periodically.
Does composite decking get hot in the sun?
Yes — composite surfaces reach 55–65°C in direct summer sun, which can be uncomfortable barefoot. PVC decking stays 30% cooler. If barefoot comfort matters (around pools, for example), consider PVC or light-coloured composite.
Is composite decking slippery when wet?
Modern capped composite with embossed wood-grain textures meets ASTM D2047 slip resistance standards when wet. Smooth-face composite from the early 2000s was notably slippery — avoid it for pool areas.
How long before composite pays for itself?
The breakeven point versus PT wood (including annual staining costs) is typically year 8–10. After that, every year is savings.
Written by
BestDecks Editorial Team
Deck Construction Specialists
BestDecks Editorial Team writes about canadian deck builders — licensed local crews build custom decks in every city, backed by one bestdecks warranty and related topics for BestDecks.ca.
