Key Takeaways:
- Aluminum decking costs $20–$45 per sq ft — the most expensive option but lasts 50+ years
- Completely fireproof (Class A) — the only decking material approved everywhere in BC's wildfire zones
- Zero maintenance forever — no staining, sealing, cleaning, or board replacement
- Interlocking panel systems provide built-in waterproof drainage for under-deck living space
- Made in Canada: AluDek (Quebec) manufactures locally
What Is Aluminum Decking?
Aluminum decking uses extruded aluminum planks with powder-coated finishes in wood-grain textures. The planks interlock to create a watertight surface, unlike wood or composite decking where water drains between boards.
This interlocking design means the space under an aluminum deck stays completely dry — creating usable covered outdoor space below second-story decks. This is a significant advantage for multi-level designs and commercial applications.
Canadian Manufacturers
| Brand | Location | Products | Price Range |
|---|---|---|---|
| AluDek | Quebec | Residential + commercial panels | $25–$40/sq ft |
| Wahoo Decks | Distributed in Canada | Complete deck systems | $30–$45/sq ft |
| LockDry | US (Canadian dealers) | Waterproof panels | $20–$35/sq ft |
| Alumadeck | US (Canadian dealers) | Residential panels | $22–$38/sq ft |
AluDek is notable as a Quebec-based manufacturer, supporting the Canadian economy and reducing shipping distances for Eastern Canadian projects.
Performance
Fire Rating
Aluminum is non-combustible — it cannot burn, melt below 660°C, or contribute to fire spread. It achieves a Class A fire rating with a flame spread index of 0. This makes it the only universally approved decking material in BC's wildfire interface zones, where composite, PVC, and all wood products face restrictions.
Weather Resistance
Aluminum does not absorb moisture, cannot rot, and is immune to freeze-thaw damage. The powder-coat finish resists UV fading for 25+ years (longer than composite caps). It performs identically in Vancouver's rain, Winnipeg's -40°C, and Halifax's salt air.
Structural Performance
Despite being lightweight (60% lighter than composite), aluminum decking panels are structurally strong enough to span 24" on centre joist spacing without deflection. Some systems allow 32" spacing, reducing substructure cost.
Cost Comparison (300 sq ft, installed)
| Material | Total Installed | Lifespan | 50-Year Cost |
|---|---|---|---|
| PT Wood | $6,000–$12,000 | 15–20 yrs | $18,000–$36,000 (3 rebuilds) |
| Composite | $9,500–$21,500 | 25–50 yrs | $9,500–$21,500 |
| PVC | $12,700–$25,600 | 30–50 yrs | $12,700–$25,600 |
| Aluminum | $18,000–$45,000 | 50+ yrs | $18,000–$45,000 |
Over a 50-year horizon, aluminum is cost-competitive with composite because it never needs replacement or repair.
Installation Notes
- Specialized installation — aluminum decking uses manufacturer-specific clip and channel systems, not standard screws
- Thermal expansion is managed by engineered expansion joints built into the panel system
- Cutting requires carbide-tipped blades — standard wood blades will not work
- No painting or finishing — the factory powder coat is the permanent finish
- Installation is typically faster than wood or composite due to interlocking panel design
Who Should Choose Aluminum?
Aluminum decking is for homeowners who want a permanent, maintenance-free deck and are willing to pay the premium. Ideal for:
- Wildfire zones in BC and Alberta where other materials are restricted
- Second-story decks where the waterproof under-deck space adds value
- Commercial properties where maintenance costs must be zero
- Waterfront and marine applications where salt air corrodes other materials
- Homeowners who plan to age in place — the deck outlasts them
