Thermal modification of timber is now globally recognised as a low environmental impact method of preserving timber for use in outdoor environments. Despite being proven over many years in contemporary European homes and commercial buildings, it is a relatively new process to New Zealand.
Thermal modification is a conceptually simple, chemical-free process. Suitable timbers are subjected to high temperatures using heat and steam in a controlled environment which permanently alter the cell structure to enhance the physical properties of the timber. The result of this is that the timber has a greatly reduced capacity to absorb moisture and makes the timber particularly resistant to decay. Thermal Modification is an environmentally friendly process resulting in an exceptionally stable, highly durable, and aesthetically pleasing timber – all desirable properties for bespoke cladding profiles.
JSC TMT® offers a selection of Thermally Modified Timbers from reliable suppliers which are active members of theInternational ThermoWood Association (ITWA)meaning that they use the patent Thermowood® process to heat treat the timber. This ensures that the product is being produced to international quality standards and make it a perfect fit for the New Zealand market. Furthermore, the JSC TMT® range offers versatility, durability, aesthetic characteristics, and environmental credentials to suit the New Zealand weather conditions.
The key properties of thermally modified timber are:
Durability gained from excellent dimensional stability and reduced moisture absorption
Able to accept darker coatings with a significant reduction in dimensional movement
Low susceptibility to fungal decay
Consistent, aesthetically pleasing colour
Easily workable and easy to maintain
Premium quality that is responsibly sourced
JSC TMT® Product Range
JSC has a selection of thermally modified timbers available, ranging from interesting feature grades to clearer grades that have minimal natural rustic characteristics. Due to the thermally modified process that the timbers undergo, they all come in rich brown tones and are suitable for a variety of interior and exterior applications such as exterior claddings, interior linings, battens and more depending on the species you choose.
Like any natural timber, the thermally modified timbers will eventually weather to shades of grey when subjected to the environmental elements of temperature, moisture, and UV rays. Therefore, the use of a premium grade oil stain with a UV protectant is recommended to maintain the looks of the product. The JSC TMT products take both oil and water-based coatings well.
JSC actively work on bringing exciting new products to help you reshape the NZ landscape. Keep an eye out for new offerings. For more information on all the JSC TMT options or a free sample please contact the JSC team who are always happy to assist.
The thermal modification process takes suitable timbers and subjects them to high temperatures using heat and steam in a controlled environment without the use of any chemicals. The heat inside the thermal modification chamber is slowly raised to 212°C and the entire process can last up to 110 hours. Once the process is complete, the equilibrium moisture percentage of the modified product is around 4-7%.
The thermal modification process permanently alters the cell structure which enhances the physical properties of the timber. The result of this is that the timber has a greatly reduced capacity to absorb moisture. With the reduction of moisture absorption, the timber is much less susceptible to cupping, expansion, contraction or distortion caused by seasonal changes in the environment. The thermal modification process removes nutrients from the wood thereby eliminating the food source for insects and fungi making it particularly resistant to decay. Thermal modification is an environmentally friendly process resulting in an exceptionally stable, highly durable, and aesthetically pleasing timber – all desirable properties for bespoke cladding profiles.
Need a custom Thermally Modified Timber solution for your next project?
At JSC, we can make your timber design dreams come true. Our expert in-house manufacturing capabilities allow us to create offering to satisfy even the most unique project requirements. Our precision moulding and machining mean we can match existing profiles and also do custom design. The possibilities are endless. Get in touch today.