Thermally Modified Timber: The Future of Sustainable Building in NZ

Why Thermally Modified Timber?

Thermally Modified Timber (TMT) is gaining popularity for its durability, stability, and non-toxic treatment process. Unlike many traditional treatments, the TMT process uses heat and steam, eliminating chemicals while reducing moisture absorption and decay. This process enhances the timber’s lifespan, making it an ideal choice for both residential and commercial applications.

JSC’s CodeMark-certified TMT range performs exceptionally well in New Zealand’s diverse climates, including its harsh conditions. It provides a robust, lower-maintenance solution that is well-suited to architectural projects requiring longevity and aesthetic appeal.

JSC’s TMT range

JSC offers a selection of premium thermally modified timber solutions, each with distinct characteristics:

TMT Taiga: A rich brown tone with natural butterfly knots, adding warmth and character to cladding and interiors.
TMT Taxon: A darker, clearer-grade timber with a fine grain and deep chocolate tones for a refined modern aesthetic.
TMT Amba (New!): A light golden-brown timber with excellent durability and a uniform appearance, perfect for various design styles.

Finishes and coatings

JSC’s TMT range is available in dressed, bandsawn, and brushed finishes, giving architects flexibility in texture and appearance. It also accepts dark coatings with minimal movement — offering enhanced design possibilities without compromising stability. Since the modified cell structure absorbs less water, dimensional stability is significantly improved, reducing cupping, splitting, and checking around fixings.

JSC’s coatings range, specifically formulated for New Zealand conditions, provides additional protection while enhancing the timber’s natural beauty, ensuring a long-lasting and striking finish.

Sustainable and trusted sourcing

JSC TMT is sourced from world-renowned suppliers known for their expertise in thermal modification. By using abundant, sustainable timber resources, JSC ensures its products meet high environmental and ethical standards, making them a responsible choice for forward-thinking architects and designers.

Versatile applications

JSC TMT is suitable for a wide range of exterior and interior applications, including cladding, battens, and panelling, as well as window frames, doors, garage doors, and internal joinery. Its rich tones, smooth textures, and superior durability make it a highly desirable material for enhancing modern architectural designs.

Request a sample

Experience JSC’s Thermally Modified Timber firsthand. Request a sample today to explore the options best suited for your next project.

JSC Vertical Shiplap Timber Weatherboard Cladding

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JSC are recognised as leaders in timber cladding and cavity system development in New Zealand, offering an extensive range of carefully selected quality products, profiles, and colour coatings to suit every design need.

NZ-Owned Business

JSC installation and specification guide and CodeMark certificate guidelines must be followed.

JSC VertiClad — Vertical Shiplap Weatherboard Cladding System – CodeMark Certificate: CM-GM30084

Location:

In wind zones up to and including extra high, as defined in NZS3604:2011 or situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS)of 2.5 kPa, where the building has been specifically engineered
In all exposure zones, excluding microclimates as defined in NZS3604:2011.

Building:

Has the scope limitations of NZBC Acceptable Solution E2/AS1, Third Edition including amendment 9 (27/06/2019), Paragraph 1.1; and,
New timber framed buildings with building wrap or rigid air barrier that comply with the NZBC Acceptable Solution E2/AS1 Third Edition including amendment 9 (27/06/2019),
Existing timber framed buildings where the designer and installer have satisfied themselves that the existing building is suitable for the intended building work
With a risk score of 0-20 when calculated in accordance with NZBC Acceptable Solution E2/AS1, Third Edition including amendment 9 (27/06/2019), Table 2
The System must only be installed vertically on vertical, flat, surfaces
The System is certified for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills
The wall cladding system is located more than 1m from a relevant boundary.

Note: See CodeMark Certificate for full and up to date information. Please refer to installation instructions and maintenance guide available for download under Documents.

The JSC Weatherboard Systems if designed and installed as per the JSC VertiClad installation and specifications guide, will meet the following provisions of the New Zealand Building Code (NZBC):

Clause B1 Structure: Performance B1.3.1, B1.3.2, B1.3.4 (a), (b), (c), (d) and (e) for the relevant physical conditions of B1.3.3 (a), (e), (f), (h), (j), and (q)
Clause B2 Durability: Performance B2.3.1(b) and B2.3.2(b)
Clause E2 External Moisture: Performance E2.3.2, E2.3.3, E2.3.5, E2.3.7(b) and (c)
Clause F2 Hazardous Building Materials: Performance F2.3.1

JSC Western Red Cedar Weatherboard System, if installed and maintained as per manufacturer’s documentation, will meet the minimum 15-year durability requirement in respect of clauses B1 and B2 of the first schedule of the New Zealand Building Code for external cladding. In a typical installation, it is likely to have a serviceable life exceeding 30 years.

CodeMark

Interior Timber Panelling & Sarking/Ceilings

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JSC has a range of species, available in a variety of timber panelling and sarking products suitable for new homes, renovations, and commercial projects.

NZ-Owned Business

The JSC Interior Panelling & Sarking Guide outlines the installation of JSC Timber panelling to internal applications in buildings covered by New Zealand building code that govern the fire performance requirements of materials used in the construction of all building forms.

Suitable for internal wall linings, and ceiling linings
JSC interior timber lining can be installed vertically, horizontally, or diagonally

Please refer to JSC Interior Panelling & Sarking guide available for download under documents for the latest guidelines.

Performance varies based on the product/species chosen. See species/product data sheets on the JSC website for more information

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