IronbarkSiding.
Premium thermally modified hardwood — designed for modern architecture and timeless appeal.
Explore the newIronbark Siding website.
We’ve launched a dedicated site for Ironbark Siding — showcasing our premium line of thermally modified hardwood designed for modern architecture and timeless appeal. Discover detailed product information, installation systems, and finishing options that bring warmth, durability, and character to any project.
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The science of transformation
The process physically alters the wood at a molecular level. By changing the sugars, the wood becomes hydrophobic and naturally resists insects and decay. This prevents moisture absorption and gives thermally modified wood siding remarkable protection against water damage, warping, swelling, and rot.
The heat treatment also creates a deep, even coloration that intensifies the longer the wood stays in the kiln. Workers carefully stack the lumber with two-inch gaps between layers so heat and steam can circulate evenly — adjusting temperature and duration for each species to achieve the ideal transformation.
“Treating hardwood to create a stable, insect- and mold-resistant product has allowed these species to play in markets they couldn’t have entered before.” — Bob Lennon
In Barbados, architects tested it by placing a piece inside a termite mound for six months. The termites ignored it completely — proof of its superior durability.
Explore Ironbark Siding ↗60-Year Rot Warranty
Ironbark siding comes with a 60-year warranty against rot — backed by the performance of thermally modified hardwood that has been proven in climates from Canadian winters to Caribbean heat.
Superior Structural Stability
High humidity environments that cause conventional wood siding to warp, cup, and fail have no effect on thermally modified hardwood — the modification is permanent and goes all the way through the board.
Improved Insulation
Thermally modified wood has lower thermal conductivity than untreated wood — a genuine improvement to your building envelope when used as cladding.
Expanded Market for Hardwoods
Hardwoods like maple, ash, birch, and oak would normally be designated for furniture or interior use. Our process takes them outside — opening up new possibilities for architects and builders.
Chemical-Free & Sustainable
Modified using only heat and steam — safe for residential, commercial, and sensitive environments. No preservatives, no toxins, no compromise.
Three ways to install.
Our thermally modified hardwood siding can use the same technology as our Snap-To-It decking. Machined grooves on the backside of the siding allow these boards to be fastened to the wall using our GRAD clips — simply screw the clip onto your strapping and snap the siding in place.
Save up to 30% on your installation time. If that doesn’t work for you, we have other fastening options available.
Watch the installation
Ironbark Siding Installation
Ironbark Siding Installation
CUTEK Extreme
CUTEK Extreme is a wood protection oil that keeps your thermally modified wood looking great for many years to come.
Many wood coatings allow moisture to seep into the wood, which can cause warping and splitting. CUTEK oils penetrate the wood creating protection from within — no peeling or flaking.
18 colours. One perfect match.
We offer 18 different options of CUTEK Colourtone to ensure you get the perfect colour for your siding.
Ironbark Siding in the wild
Our clip system
ThermalWood Canada has the sole rights to manufacture state-of-the-art GRAD clips — outside of France — to create an easy, DIY installation of your hardwood decking and cladding. The clips are made of POM (polyoxymethylene), one of the highest performing plastics on the market — the same material used to manufacture the soles of ski boots.
The ThermalWood Handbook
Want to dive deeper into the benefits and science behind thermally modified wood? Our ThermalWood Handbook covers everything you need to know — from the modification process and performance benefits to applications for siding, decking, and more.
Whether you’re an architect, builder, or homeowner, this comprehensive guide will help you make informed decisions about using thermally modified wood in your next project.
Download the HandbookElevate your project with Ironbark.
We want to know all about your project. Big or small, ThermalWood Canada is here to bring it to life.
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