LumberTherm™ 

Timber that endures New Zealand’s climate – stable, sustainable, and beautifully natural. Crafted through precision thermal modification using only heat and steam, LumberTherm™ delivers the look of real wood with the performance of engineered materials.

What Is Thermally Modified Timber?

Thermal modification transforms carefully selected hardwoods through a controlled combination of heat, steam, and time – no chemicals, no compromise. The process alters the wood’s cellular structure, increasing its resistance to moisture, decay, and warping while deepening its natural colour.  The result: a stable, low-maintenance timber that performs beautifully in New Zealand’s outdoor and architectural environments.

✓ Naturally Durable
Improved resistance to rot, insects, and fungi – performance proven for exterior applications.

✓ Dimensionally Stable
Reduced expansion and contraction mean less cupping, twisting, or movement over time.

✓ Eco-Friendly Process
No chemical additives or preservatives. Heat and steam do the work – nature enhanced by science.

Sustainability

From responsibly sourced timber to chemical-free modification, Lumbertherm embodies our commitment to sustainability. Our thermal process produces zero toxic waste and minimal emissions. Every board is traceable to certified forestry, ensuring renewable resources and a lighter footprint across every project.

PureOak ™

Thermally modified Red Oak

Kuro™

Thermally modified Kwila

Fermo™

Thermally Modified Radiata. 

Exterior Cladding

Available in Bevelback, Rusticated, Shiplap and Board and Batten Weatherboard Profiles with a high quality finish of Smooth, Textured or Bandsawn options. For those looking to enhance its appearance even further, applying a stain or protective coating can enrich its colour and extend its longevity while maintaining its natural beauty. We also offer Box corners, Scriber, Fascia, Cavity batten and Finishing boards

Codemarked for your peace of mind.