Tongue and groove thermowood 420cm (22x150mm)

Tongue and Groove Thermowood 420cm (22x150mm)

The Tongue and Groove Thermowood 420cm (22x150mm) is a high-performance thermally modified wood cladding board designed for long-lasting stability, durability and a natural modern appearance. The thermal modification process enhances the wood’s resistance to moisture and reduces movement, making it ideal for demanding exterior and interior applications.

With dimensions of 4200mm in length, 22mm in thickness and 150mm in width, these boards provide a strong and reliable cladding solution suitable for architectural façades, garden structures and decorative timber projects.

Key Benefits

• Thermally modified wood for improved durability.
• Enhanced dimensional stability and reduced warping.
• Strong tongue and groove connection for a seamless finish.
• Chemical-free heat treatment process.
• Suitable for interior and exterior applications.
• Modern natural wood appearance.
• Robust 22mm thick profile for structural strength.

Applications

This thermowood tongue and groove cladding is suitable for a wide range of projects, including:

• Facade cladding
• Garden rooms
• Saunas
• Summer houses
• Cabins
• Exterior walls
• Interior feature walls
• Architectural timber designs

Specifications

Installation

Install the boards on a ventilated and level timber subframe to ensure optimal performance. Maintain adequate airflow behind the cladding and use stainless steel or corrosion-resistant fixings to prevent staining. It is recommended to allow the boards to acclimatise before installation.

Maintenance

Thermowood requires minimal maintenance due to its improved stability. For exterior use, a UV-protective oil or finish can be applied to maintain the original colour. Without treatment, the wood will naturally weather to a silver-grey patina over time.

Related Products

Complete your project with our decking screws and garden fencing.

How to Install Thermowood Tongue and Groove Cladding

1. Prepare a straight and ventilated timber framework.
2. Allow the boards to acclimatise before installation.
3. Install a breathable membrane if required.
4. Start fitting from the bottom upwards.
5. Connect boards using the tongue and groove profile.
6. Fix with stainless steel or corrosion-resistant screws.
7. Ensure proper ventilation behind the cladding.

Frequently Asked Questions

What is Thermowood?

Thermowood is wood that has been heat-treated at high temperatures without chemicals to improve durability, stability and moisture resistance.

Is Thermowood suitable for outdoor use?

Yes. It is designed for exterior applications such as façades, garden buildings and architectural cladding.

Does Thermowood need maintenance?

Only minimal maintenance is required. A UV-protective finish can be applied, otherwise it will naturally grey over time.

Can it be used indoors?

Yes. It is also suitable for interior walls, saunas and decorative timber projects.

Which fixings are recommended?

Stainless steel or corrosion-resistant fixings are recommended for long-term durability.