Composite vs Treated Decking: Which Is Right for Your Deck?

The short answer

Pressure-treated decking wins on upfront price and is easy to work with. Composite decking wins on maintenance, because it never needs staining or sealing. The right choice depends on your budget today and how much time you want to spend caring for the deck later.

Cost

Treated boards cost noticeably less per square foot, which is why they remain the default for budget-conscious builds. Composite costs more upfront, but there are no recurring costs for stain, sealer or replacing weathered boards.

When you compare, think in terms of total cost over the years you plan to own the deck, not just the materials invoice.

Maintenance

• Treated wood: plan to clean and seal or stain it regularly to slow weathering, checking and greying.
• Composite: a wash with soap and water is typically all it needs. It does not require sanding, staining or sealing.

Alberta's climate

Alberta decks deal with hard freeze-thaw cycles, heavy snow and very dry air. Treated boards commonly check and cup as they dry, and chinook warm-ups can speed that up. Composite is more dimensionally stable, though it expands and contracts with temperature, so leave the gaps the manufacturer specifies. Use a plastic shovel when clearing snow to protect the surface.

Lifespan and durability

Both materials resist rot and insects. Composite also resists fading, staining and splintering, though it can be scratched or get hot in direct summer sun.

Appearance and feel

Wood has a natural grain and can be stained any colour. Composite comes in a range of colours and profiles that stay consistent over time, with modern capped boards imitating wood grain closely.

How to decide

• Choose treated decking if upfront budget matters most, you enjoy wood, and you are happy to maintain it.
• Choose composite if you want a long-lasting, low-maintenance deck and are comfortable with a higher initial cost.
• Building a deck frame? Use treated lumber for the framing either way.