Thermally Modified Ash

Technical overview — European Ash thermally modified for facade cladding, decking, and architectural applications.

This page provides a reference of available thermo ash profiles, dimensions, technical characteristics, and supply format. Use it to identify the right board specifications for your cladding or decking project.

For a broader overview of the material and its applications, see thermally modified ash. For background on the modification process, see what is thermo ash.

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Looking for Cladding?

Facade boards, profiles and fixing options

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Outdoor decking boards and surface profiles

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Need Specs?

Material data, dimensions and tolerances

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Need Pricing?

Container-scale quotes and lead times

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Container-scale supply · Export-ready logistics · Samples and technical documentation available on request

Material Data

Material Overview

Species	European Ash (Fraxinus excelsior)
Modification temperature	392–428°F (200–220°C)
Durability Class	Class 1–2 (EN 350)
Moisture Content	4–6%
Density	~40 lb/ft³ (650 kg/m³)

Standard Dimensions

Thickness	0.8–2.4 in (20–60 mm)
Width	2.4–7.1 in (60–180 mm)
Length	6–10 ft (1.8–3 m)

Custom dimensions available for volume orders. See full specifications for detailed tolerances and grading.

Dimensions

Standard Dimensions

Thickness

0.8–2.4 in

(20–60 mm)

Width

2.4–7.1 in

(60–180 mm)

Length

6–10 ft

(1.8–3 m)

Finishing

Profiles & Surface Options

Planed

Smooth finish for modern facades and interiors.

Profiled

Tongue-and-groove and specialty profiles for cladding systems.

Custom Profiles

Available for volume orders — contact us with your specifications.

Quality

Quality Grading and Selection

Boards are inspected for straightness, surface quality, knot distribution and consistency of thermal modification. Grading follows established European hardwood standards adapted for thermally modified material.

Available in select and standard grades. Select-grade material is typically specified for visible facade cladding and high-end decking, while standard-grade boards are used for structural subframes and concealed applications. View thermo ash specifications for detailed grading criteria.

Properties

Key Material Properties

Dimensional Stability

Equilibrium moisture content of 4–6% minimizes expansion, contraction and warping.

Low Moisture Uptake

Reduced from 12–15% to 4–6% for consistent performance in exterior conditions.

Durability Class 1–2

EN 350 rated. Suitable for ventilated facade cladding and exterior decking.

Chemical-Free

Modified at 392–428°F (200–220°C) using only heat and steam. No additives.

Container-Scale Supply

Approx. 1,400 ft³ (40 m³) per 40 ft container. Export-ready packaging.

Custom Dimensions

Custom thickness, width and length configurations for volume orders.

Applications

Typical Product Uses

Ventilated facade systems — exterior cladding with a minimum 1 in (25 mm) air cavity

Decking and terraces — residential and commercial outdoor flooring with hidden fasteners

Exterior architectural facades — feature walls, soffits and screen elements

Hospitality and commercial projects — hotels, restaurants, retail and mixed-use developments

Residential developments — private homes, multi-family housing and renovation projects

Logistics

Supply Format

Typical container load: approx. 1,400 ft³ (40 m³) per 40 ft container

Export-ready packaging — palletized and wrapped for international shipping

Full documentation — packing lists, certificates of origin, phytosanitary certificates

Suitable for distributors, wholesalers, and project-based orders

For supply logistics and B2B ordering, see thermo ash supplier.

Downloads

Profile Samples Catalog

Download our full profile catalog with photo samples — thermo ash profiles for facade cladding and decking systems.

Thermo Ash — Profile Samples

Photo catalog of available thermo ash profiles: facade cladding, decking, and specialty profiles with dimensions.

ZIP Archive~19 MBProfile Photos

Download Catalog

Thermo Ash Specification Sheet

Material data, dimensions, and technical characteristics in PDF format.

PDFTechnical Data

Download Spec Sheet

Request Pricing Download Spec Sheet Discuss Your Project

Container-scale supply available. Technical specification sheet available on request.

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.

Request Pricing Download Spec Sheet Discuss Your Project

Used for facade cladding, decking, and architectural projects. Container-scale supply available.

B2B supply

Technical information available

Container shipments to the US and EU

FAQ

Frequently Asked Questions

What are typical thermo ash dimensions?

Standard thermo ash boards are available in thicknesses of 0.8–2.4 in (20–60 mm), widths of 2.4–7.1 in (60–180 mm), and lengths of 6–10 ft (1.8–3 m). Custom dimensions are available for project-specific and volume orders.

What profiles are available?

Woodmann offers planed, brushed, and profiled finishes. Planed boards provide a smooth surface for cladding. Profiled boards include anti-slip textures for decking. Custom profiles are available for volume orders.

What is the density and durability class?

Thermally modified ash has a density of approximately 40 lb/ft³ (650 kg/m³), an equilibrium moisture content of 4–6%, and achieves Durability Class 1–2 according to EN 350.

Is thermo ash available in container quantities?

Yes. Woodmann supplies thermo ash in container-scale volumes, with a typical 40 ft container holding approximately 1,400 ft³ (40 m³) of material. Orders include export-ready packaging and full documentation for international shipping.

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