How long does Trex composite decking last compared to cedar in New Brunswick?

Trex composite decking will last 25 to 50 years in New Brunswick's climate, while western red cedar typically lasts 15 to 20 years with consistent maintenance, making Trex the significantly longer-lasting option. This performance gap is driven almost entirely by how each material handles the province's harsh weather cycling, and the difference becomes more pronounced over time.

New Brunswick's climate is uniquely demanding on outdoor building materials. Decks in Moncton, Saint John, and Fredericton endure roughly 100 to 120 freeze-thaw cycles per year between late October and mid-April. Each cycle forces moisture trapped in wood fibres to expand and contract, which gradually breaks down the cellular structure of cedar. Even the highest-grade western red cedar begins showing surface checks, splits, and greying within the first two to three seasons if left unsealed. With diligent annual maintenance including cleaning, sanding, and reapplication of a penetrating UV-protective stain or oil, cedar can be pushed to the 15-to-20-year range before structural replacement becomes necessary. In practice, many New Brunswick homeowners fall behind on that maintenance schedule, and cedar decks in the province commonly show serious deterioration by year 10 to 12.

Trex composite decking, particularly the current-generation Enhance and Transcend lines, handles these same conditions without any of that upkeep. The boards have a polymer shell cap that fully encases the wood-plastic composite core, preventing moisture absorption. Since no water gets into the material, freeze-thaw cycling has essentially no degrading effect. Trex Transcend and Enhance carry 25-year fade and stain warranties and 25-year structural warranties, with expected real-world lifespans reaching 30 to 50 years depending on the product tier.

The cost comparison over time heavily favours Trex in New Brunswick. Cedar decking boards cost roughly $3 to $5 per linear foot, but you will spend $200 to $500 annually on stain, sealant, and cleaning supplies for a typical 14-by-20-foot deck. Over 20 years, maintenance costs alone add $4,000 to $10,000 to the cedar deck's total. Trex boards cost $5 to $12 per linear foot depending on the line, with Enhance Basics at the low end and Transcend Lineage at the premium end. Ongoing maintenance is limited to periodic soap-and-water cleaning, costing essentially nothing.

One area where cedar holds a slight advantage is underfoot feel during New Brunswick's brief but warm summers. Cedar stays cooler than composite in direct sunlight, and some homeowners prefer its natural texture. Cedar is also lighter to work with, which can matter for DIY projects. However, Trex has improved its heat management in recent product generations, and the lighter colour options in the Transcend line stay noticeably cooler than the darker shades.

For the structural framing underneath the deck surface, both materials still rely on pressure-treated lumber in New Brunswick, so the substructure lifespan is equivalent regardless of your decking choice. The real longevity difference is in the walking surface and railings. If you are building a deck in New Brunswick and want a surface that will still look presentable in 2045 without annual refinishing weekends, Trex is the clear winner on durability. If you strongly prefer the look and feel of real wood and are committed to maintaining it every single year, cedar remains a viable but higher-effort choice.

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