Thermo Ash Decking — B2B Supply of Decking Boards
Thermally modified ash decking boards supplied at container scale to distributors, contractors, architects and developers. Profiles, dimensions and samples available on request.
Who This Is For
B2B Decking Supply
- Distributors and wholesalers
- Contractors and installers
- Architects and specifiers
- Developers and project owners
What You Can Request
Information & Quotes
- Available decking profiles and surface options
- Board dimensions and tolerances
- Physical samples on request
- Container-scale pricing
- Lead times and shipping windows
Container-scale supply · Export-ready logistics · Technical documentation available · Samples on request · Project-based consultation
Woodmann supplies thermo ash decking boards with profiled and smooth finishes for outdoor terraces, rooftop decks, and commercial outdoor spaces. The thermal modification process reduces moisture content to 4–6%, resulting in a deck surface that resists warping, cupping, and seasonal movement — making it one of the most stable hardwood decking options for exterior use. Available with hidden fastener compatibility (T4, T6) for residential and commercial projects.
The density and hardness of thermally modified ash make it well suited for high-traffic outdoor surfaces where softer species like pine or cedar would deteriorate quickly. Increasingly specified for waterfront terraces, resort environments, and rooftop installations. For volume supply or project-specific profiles, contact our team.
Applications
Where Thermo Ash Decking Is Used
Thermo ash decking is specified for demanding outdoor environments where performance, aesthetics and longevity are essential. Learn more in our complete guide to thermo ash.
Residential terraces
Rooftop decks
Pool surrounds
Hospitality terraces
Public outdoor areas
Construction
Substructure and Installation
Thermo ash decking is installed on a ventilated substructure with joists spaced at 16–20 in (400–500 mm) centers. Proper drainage and air circulation beneath the deck surface are essential for long-term performance. The substructure can be constructed from thermally modified timber or aluminum profiles.
Boards are typically fixed using hidden clip systems (T4, T6) that create a fastener-free surface, or with stainless steel face screws for high-traffic commercial applications. A gap of approximately 0.2 in (5 mm) between boards allows water drainage and thermal expansion.
For detailed construction guidance, see our installation guide.
Profiles
Typical Decking Dimensions
Thickness
approx. 1 in
(26 mm)
Width
4.5–5.5 in
(115–140 mm)
Length
6–10 ft
(1.8–3 m)
Profiled surface for slip resistance. Custom decking profiles available for volume orders.
Why Thermo Ash
Key Benefits for Decking
Reduced moisture movement compared to untreated hardwood
Improved durability for demanding outdoor environments
Warm natural color tone that ages gracefully
Compatible with hidden clip systems (T4, T6)
Chemical-free thermal modification at 392–428°F (200–220°C)
Profiled surface options for slip resistance
Maintenance
Aging and Surface Care
Over time, thermo ash decking exposed to sunlight develops a natural silver-grey patina. This weathering is a surface-level change that does not affect the board's structural integrity or dimensional stability. Many architects and homeowners prefer this natural aging as part of the design intent.
If the original warm brown appearance is preferred, UV-protective wood oil should be applied after installation and reapplied every 12–24 months depending on exposure. Regular cleaning with mild detergent and soft brushing removes surface debris. For complete care instructions, see our maintenance guide.
Performance
Decking Performance Across Climates
Thermo ash decking performs consistently in a wide range of climatic conditions — from hot, arid environments in the southwestern US to humid coastal regions and cold northern climates with freeze-thaw cycles. The thermal modification process reduces the wood's hygroscopic response, meaning boards absorb and release moisture more slowly and to a lesser extent than untreated hardwood.
In practice, this translates to less seasonal cupping, crowning and gapping between boards — common problems with conventional wood decking. The material's density of approximately 40 lb/ft³ (650 kg/m³) also contributes to its resistance to surface wear in high-traffic areas such as hotel terraces and public boardwalks.
For projects in specific US regions, see our regional supply pages including California, Florida and Texas. View our product catalog for available decking profiles.
Container-scale supply available. Technical specification sheet available on request.
Portfolio
Decking Projects
Completed thermo ash decking installations supplied by Woodmann.
Explore
Related Pages
FAQ
Frequently Asked Questions
What is thermo ash decking?
Thermo ash decking is outdoor flooring made from European ash hardwood that has been thermally modified at 392–428°F (200–220°C). The modification process improves the wood's dimensional stability and resistance to moisture, making it suitable for long-term exterior use.
How durable is thermo ash decking?
Thermo ash decking offers improved resistance to moisture movement and biological degradation, making it suitable for long-term outdoor use. The material achieves Durability Class 1–2 according to EN 350.
What are the typical dimensions for thermo ash decking?
Thickness: 1 in (26 mm), Width: 4.5–5.5 in (115–140 mm), Length: 6–10 ft (1.8–3 m).
What substructure is required for thermo ash decking?
Thermo ash decking requires a ventilated substructure with joists spaced at 16–20 in (400–500 mm) centers. The substructure should allow drainage and air circulation beneath the deck surface. Stainless steel or hidden clip fasteners are recommended.
How does thermo ash decking age over time?
When left untreated, thermo ash decking gradually develops a silver-grey patina due to UV exposure. This surface change does not affect structural performance. UV-protective oil can be applied to maintain the original dark brown color.
Process
What Happens After You Submit a Request
1
You submit a request
Tell us your application, estimated volume and destination.
2
We review
Our team reviews profile, volume and destination requirements.
3
We respond
You receive relevant supply details, lead times and pricing context.
Request Thermo Ash Pricing or Specification Sheet
Tell us your application, estimated volume, and destination. We will respond with relevant product information, technical details, and supply options.
Used for facade cladding, decking, and architectural projects. Container-scale supply available.
Request Thermo Ash Decking Supply
Share your application, volume and destination. We respond with profiles, lead times and container-scale supply options.
Pricing depends on profile, volume and destination — available on request.