Durability
Class 1 durability. Naturally resistant to termites, fungi and rot, with a 50-year warranty above ground and 25 years in ground or fresh water.
Accoya®
Ultra-high performance, sustainable timber
Harper Timber is an Accoya® Approved Manufacturer. We supply Accoya and can mill it into cladding, decking, joinery, windows and doors to your specification.
Accoya is plantation-grown radiata pine, permanently modified by a patented acetylation process that makes it virtually unaffected by water. The result is a timber that rivals the best tropical hardwoods for durability and stability, from sustainable, FSC® certified sources.
Why Accoya
Stability
Virtually no swelling or shrinking, so it stays straight and true before, during and decades after installation. Doors and windows keep working smoothly.
Looks
A clean, smooth finish that takes paint and stain exceptionally well. Also available grey-to-the-core for a naturally weathered look.
Low maintenance
No regular treatments needed, and coatings last longer because the timber barely moves.
Sustainability
FSC® certified and Cradle to Cradle Certified® Gold, with Platinum for Material Health. Non-toxic and low carbon.
Uses & profiles
Accoya suits almost any exterior or high-moisture application:
- Cladding and facades
- Decking, including around pools
- Windows and doors
- Joinery, screening and outdoor structures
Profiles
- Tapered
- Square
- Tapered-edge shiplap
- Custom profiles milled to your specification
Finishes
Natural, grey-to-the-core, stained or painted. Ask us about coatings and pre-finishing.
See also our cladding and decking ranges, and other architectural timbers.
Technical information
| Property | Accoya |
|---|---|
| Species | Radiata pine, acetylated |
| Origin | New Zealand |
| Durability class | Class 1 |
| Warranty | 50 years above ground; 25 years in ground or fresh water |
| Density | 515 kg/m³ |
| Hardness | 4.1 kN |
| Radial shrinkage | 0.4% (green to 12% moisture content) |
| Tangential shrinkage | 0.8% (green to 12% moisture content) |
| Bushfire | Approx. BAL-19* |
| Certification | FSC®, Cradle to Cradle Certified® Gold |
* Bushfire attack level (BAL) ratings are approximate and depend on correct treatment and construction. Check the requirements for your site before you build.
Stock and sizes change. Please contact us to confirm availability and pricing.
Got a cutting list?
Send it through and we'll come back with a price.