Modified wood

ThermoWood® Poplar

ThermoWood® Aspen — often marketed as Thermo Poplar — is a thermally modified hardwood alternative derived from aspen poplar. It forms a sustainable, environmentally friendly substitute for tropical hardwood species such as afrormosia and African padauk.

During thermal modification, the wood is heated to approximately 200°C under pressure in an oxygen‑reduced (inert) atmosphere. This controlled process permanently alters the cell structure of the wood, similar to a high‑precision steaming treatment, resulting in exceptional performance characteristics.

ThermoWood® Poplar is lightweight, stable, highly durable and nearly knot‑free — making it ideal for façade cladding, gates, architectural detailing and refined visible applications.

Delivery subject to stock availability.
Free pick up in our warehouse at Zottegem.
Shipping within Europe possible.

Available dimensions and thickness
Thermo Poplar — Rough Sawn
- 26 × 155 mm — Lengths: 1.20 / 1.50 / 1.80 / 2.10 / 2.40 / 2.70 / 3.00 m
- 32 × 155 mm — Lengths: 2.40 / 2.70 / 3.00 m
Qualities
Thanks to the thermal modification process, ThermoWood® Poplar offers the following advantages:
- High dimensional stability due to minimal movement
- Strongly improved durability (class 1–2)
- Reduced moisture absorption compared to untreated wood
- Up to 70% less swelling and significantly reduced shrinkage
- Excellent shape retention, even under changing weather conditions
- Lighter than tropical hardwood, allowing fast and easy installation
- More economical than tropical alternatives
- Naturally resistant to fungi and insects
- Warm gold‑brown colour that weathers evenly to a silver‑grey patina
- Nearly knot‑free, perfect for clean, modern façade lines and precision joinery
Applications
ThermoWood® Poplar is suitable for both structural and aesthetic applications:
- Façade cladding — stable, lightweight and knot‑free
- Gate cladding — homogeneous, modern finish
- Roof overhangs
- Exterior ceilings & wall cladding
- Garden buildings, outdoor structures & canopies
- Interior wall and ceiling finishing
- Lightweight furniture and interior components
Technical specifications
- Species:Populus tremuloides
- Durability class: 1–2
- Density / specific gravity: approx. 400 kg/m³ at 12% moisture content
- Finish: rough‑sawn
- Certification: PEFC
- Structure: homogeneous, fine texture, virtually defect‑free
- Colour: light to gold‑brown; naturally weathers to silver‑grey
- Stability: excellent dimensional stability due to thermal modification