What Makes PVC Different from Composite?
PVC (polyvinyl chloride) decking and composite decking look similar but differ at the molecular level. Composite contains wood fibres mixed with plastic — typically 50/50. PVC decking is 100% cellular PVC with zero wood content.
This matters because wood fibres — even encapsulated in plastic — can absorb small amounts of moisture over time. PVC cannot absorb moisture at all. In high-moisture environments like Vancouver's coast, Atlantic provinces, or pool surrounds, PVC has a measurable performance advantage.
Top PVC Brands in Canada
| Brand | Lines | Price Range | Warranty | Notes |
|---|---|---|---|---|
| AZEK (TimberTech) | Vintage, Harvest | $16–$22/sq ft | Lifetime limited | Market leader in PVC |
| Wolf Serenity | Seaside, Harbor | $14–$18/sq ft | 25-year limited | Good mid-range option |
| Endeck | — | $12–$16/sq ft | 25-year limited | Canadian brand |
| Zuri Premium | — | $18–$25/sq ft | 25-year limited | Ultra-premium appearance |
Performance Advantages
Moisture Immunity
PVC decking is 100% waterproof. It cannot swell, warp, or rot regardless of exposure. Install it directly adjacent to pools, hot tubs, or over water features. In coastal environments with salt spray, PVC outlasts every other decking material including composite.
Heat Performance
Contrary to common belief, PVC decking stays cooler underfoot than most composite decking in direct sun. The cellular PVC structure doesn't absorb and retain heat the way wood-filled composite does. AZEK's testing shows surface temperatures up to 30% lower than comparable composite boards.
Stain Resistance
PVC's non-porous surface resists staining from food, beverages, grease, and mould. Red wine, ketchup, sunscreen — wipe them off with soap and water. Try that on a cedar deck.
Installation Differences
PVC decking has higher thermal expansion than composite or wood. In cities with extreme temperature ranges like Calgary or Winnipeg (spans of 70°C+ from winter to summer):
- End-to-end gap: 6mm minimum at butt joints
- Side gap: 5mm between boards
- Never install below -4°C — the material becomes brittle and can crack during cutting
- Use manufacturer-specified fasteners — PVC requires specific screw profiles to prevent mushrooming
Cost for a 300 sq ft Deck
| Component | Budget | Mid-Range | Premium |
|---|---|---|---|
| PVC boards | $3,600 | $4,800 | $6,600 |
| Substructure (PT) | $900 | $1,200 | $1,500 |
| Fasteners | $200 | $350 | $500 |
| Railings | $2,000 | $3,500 | $5,000 |
| Labour | $6,000 | $8,400 | $12,000 |
| Total installed | $12,700 | $18,250 | $25,600 |
PVC vs Composite — Head to Head
| Factor | PVC | Composite |
|---|---|---|
| Moisture resistance | Superior — zero absorption | Good — capped but wood-core |
| Heat in sun | Cooler | Warmer |
| Scratch resistance | Lower — softer surface | Better — mineral caps available |
| Price | Higher ($12–22/sq ft) | Lower ($6–18/sq ft) |
| Weight | Lighter | Heavier (wood content) |
| Environmental | Recyclable PVC | Better — recycled wood + plastic |
| Appearance | Excellent — realistic grain | Excellent — realistic grain |
Who Should Choose PVC?
PVC is the right choice for pool and spa surrounds, waterfront docks, covered porches where moisture drips, and any application where absolute moisture immunity matters more than upfront cost. It's also the preferred material for commercial decks in restaurant patios where food and drink spills are constant.
