How does the cost of thermally modified wood compare to composite in NB?

Thermally modified wood typically costs $40-60 per square foot installed in New Brunswick, making it competitively priced with mid-range composite decking ($45-65/sq ft) but less expensive than premium composite options ($60-75/sq ft).

Thermally modified wood represents an interesting middle ground between natural wood and composite materials. The thermal modification process heats wood (usually ash, pine, or poplar) to 180-230°C in controlled conditions, fundamentally changing its cellular structure to improve durability and dimensional stability. In New Brunswick's challenging climate, this translates to significantly better performance than regular lumber while maintaining the authentic wood feel that many homeowners prefer.

Cost-wise, you're looking at roughly similar upfront investment between thermally modified wood and quality composite. A typical 12x16 deck (192 sq ft) would run $7,700-$11,500 for thermally modified versus $8,600-$14,400 for composite. However, the long-term cost equation differs significantly. Thermally modified wood still requires periodic maintenance in New Brunswick's Maritime climate — expect to clean and oil it every 2-3 years compared to composite's virtually zero maintenance. That maintenance adds $600-$1,200 every few years for a typical deck.

New Brunswick's freeze-thaw cycles and humidity present unique challenges for any wood product. Thermally modified wood handles our climate better than regular lumber because the modification process reduces the wood's ability to absorb moisture by 40-60%. This means less swelling, shrinking, and splitting during our 100+ annual freeze-thaw cycles. However, it's not maintenance-free like composite — the Maritime humidity and UV exposure will still gradually weather the surface, requiring periodic cleaning and re-oiling to maintain appearance and performance.

Practical considerations for NB installations include timing your project during our limited building season (May through October) and ensuring proper ventilation underneath the deck to combat our high humidity levels. Thermally modified wood can be installed using standard deck construction techniques, but you'll want to pre-drill screw holes to prevent splitting, especially in colder weather. The material works well with hidden fastener systems, giving you that clean, fastener-free surface appearance.

Choose thermally modified wood if you want authentic wood aesthetics, don't mind periodic maintenance, and prefer supporting sustainable forestry (it's often locally sourced). Go with composite if you prioritize zero maintenance, have a waterfront property with extreme moisture exposure, or want the longest warranty coverage (25-50 years versus 15-25 years for thermally modified).

For the best results with either material in New Brunswick's climate, ensure your contractor understands proper ventilation, drainage, and fastening techniques specific to our Maritime conditions. Both materials perform well here when installed correctly, but improper installation amplifies problems in our challenging freeze-thaw environment.