Siding & Decking · Thermally Modified
Hardwood-level durability from a domestic species, with nothing but heat and steam.
Thermally modified wood starts as an ordinary domestic species — Ash or Pine — and gets transformed by heat alone. No chemicals, no preservatives, just high heat and steam in a low-oxygen process that changes the wood at a cellular level, giving it a warm, uniform, slightly darker color and a real jump in durability. It's quickly becoming one of the most requested siding and decking materials on the market, and for good reason.
Characteristics
The thermal modification process dramatically reduces the wood's ability to absorb moisture, boosting resistance to rot, decay, and insects to a level that rivals tropical hardwoods — without a drop of chemical treatment. It's also dimensionally stable, resisting the expansion, shrinkage, and warping that raw softwood is prone to. Because it's lighter than dense exotics, it's easier to install with standard self-drilling fasteners, and it retains less heat in direct sun, so it stays more comfortable underfoot on a hot Florida afternoon.
Also Used For
The same stability and durability make thermally modified Ash and Pine a strong decking choice, and it mills into tongue and groove or custom trim profiles.
Common Questions
Thermally modified wood is heated to high temperatures (well over 350°F) in a low-oxygen process with no chemicals — just heat and steam. That changes the wood at a cellular level, making it far more resistant to rot, decay, and moisture, similar to a tropical hardwood, while starting from a domestic species like Ash or Pine.
Yes — the thermal modification process improves dimensional stability and rot resistance, which matters in Central Florida's humidity, and the treated wood also retains less heat than dark hardwood decking, so it stays cooler underfoot in direct sun.
No chemicals are used in the modification process itself — no copper, no chromium, nothing toxic. It's lighter and easier to install than dense tropical hardwoods, working well with standard self-drilling fasteners, and needs only minimal ongoing maintenance.
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