ThermalAged
Collection
Rustic character, enhanced performance
Rooted in our 30+ year legacy of quality character wood, Trestlewood's ThermalAged Collection blends the weathered appearance of Aged lumber with the performance benefits of thermal modification—a chemical-free process that enhances durability, dimensional stability, and resistance to decay, rot, and insects. This same process turns the wood a deep brown, making ThermalAged our darkest and most color-consistent offering of brown weathered lumber.
Increased capacity
Having recently installed our second thermal kiln, we are positioned to dramatically expand production—while continuing to deliver the quality and rustic character that define our ThermalAged line.
What is thermally modified wood?
Thermally modified wood is wood that has been heat-treated in a specialized kiln to transform its structure at a cellular level. The result? A beautiful, chemical-free wood product with improved longevity—beneficial for demanding climates and stability-sensitive applications.
Explore the Options
Color
ThermalAged Lumber typically features rich medium to dark brown tones. The final hue depends on the kiln temperature—higher heat creates darker browns. For projects needing lighter tones, custom runs are available on orders of 7,500+ board feet. Because the color penetrates the full board thickness, cut edges remain generally consistent in tone. Note that in exterior applications, untreated ThermalAged wood will weather naturally over time—often going gray.
Dark
Typically baked at 210-215°C
Medium
Typically baked at 180-190°C
Unmilled / Milled
ThermalAged Lumber can be left unmilled or can be milled into a variety of profiles, including T&G and Shiplap.
