When we do a deck estimate, the first material question is almost always composite versus pressure-treated. Both are good options. The right choice depends on your budget, how much maintenance you want to do, and what you want the deck to look like in ten years. Here is an honest comparison.

Pressure-Treated Lumber: The Basics

Pressure-treated lumber is the most common decking material in Ontario. It is affordable, widely available, and structurally sound. A well-built pressure-treated deck will last twenty to thirty years with regular maintenance. That maintenance includes annual cleaning, re-staining or sealing every two to three years, and checking for warping or splitting boards. The wood will grey naturally if left unsealed, which some homeowners like and others do not.

Composite Decking: The Basics

Composite decking, from brands like Trex and TimberTech, is made from a mix of wood fibre and recycled plastic. It does not rot, does not splinter, and does not need staining or sealing. The surface stays consistent in colour and texture for much longer than wood. The tradeoff is cost: composite decking typically runs 40 to 60 percent more than pressure-treated for materials alone. Over a twenty-year period, the maintenance savings often close that gap.

Which Lasts Longer?

A composite deck with a good warranty, Trex Transcend carries a 25-year fade and stain warranty, will look better longer than a pressure-treated deck that has not been maintained. But a well-maintained pressure-treated deck can last just as long structurally. The framing on both types of decks is pressure-treated regardless, because composite decking is not structural.

Our Recommendation

For clients who want a low-maintenance deck and plan to stay in the home for ten or more years, composite is usually the better investment. For clients with a tighter budget or who are planning to sell in the next few years, pressure-treated is a solid choice. We build both and can show you samples of each during the estimate visit.

Whatever material you choose, the quality of the framing and the fastening system matters as much as the decking boards. A composite deck on a poorly built frame will have problems. We build the frame the same way regardless of what goes on top.