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Jarrah

ITI NZ

Jarrah is native to southwestern Australia, it is a heartwood with a rich dark brownish-red colour. It can have straight or interlocked grain with an even medium coarse texture. Considered to be one of the world's most durable timbers. Typical uses include heavy construction, general joinery, boatbuilding and other marine applications. The warm colours and high density make for excellent T&G flooring. Gum veins are common and add to the natural character. 

A large tree producing light to dark red timber, darkening to a uniform red-brown mahogany colour. It can have a straight or interlocked grain with an even medium coarse texture. 

We do not recommend acrylic coating with Jarrah. The water-based coating can change the colour from rich reddish-brown to dark orange; a solvent may change the colour from natural rich reddish-brown to light reddish/orangey-brown. We only recommend an oil stain, that keeps the natural deep reddish-brown colour of the timber itself.

Details
Specifications

Botanical Name
Eucalyptus Marginata 

Origin
Australia

Scope of use

Interior

  • Structure
  • Wall/Ceiling
  • Furniture
  • Flooring 

Exterior

  • Structure
  • Deck/Floor
  • Doors/Windows
  • Heavy Construction 

Marine

Features

Endgrain
Diffuse large pores arranged in diagonal rows, few solitary growth rings, narrow rays with normal spacing but not visible to the naked eye. 

Rot Resistance
Jarrah is rated as very durable in terms of decay resistance. It is also quite resistant to insect attacks. 

Workability
Jarrah tends to be difficult to machine due to its high density and interlocked grain. It also has a moderate blunting effect on cutting edges but it does turn, glue, and finish well. 

Common uses
Flooring, heavy construction, veneer, cabinetry, outdoor furniture, and turned objects.

Basic Info

Durability Above GroundVery Durable 

Density Air Dry 820 kg/m3 

Shrinkage Radial More than 5 %
Shrinkage Tangental More than 8 % 

Stability Kiln Dry Stable
Stability Green Prone to shrinkage and distortion

Mechanical Properties

Janka Hardness 10 kN
Modulus of Rupture 112 MPa
Modulus of Elasticity 13 GPa
Max Crush Strength 61 MPa 

NZAS Ignitability 13
NZAS Flame Spread 3
NZAS Heat Evolved 4
NZAS Smoke Developed 2
ASTM Flame Spread 42

Overview

Certifications Available
PEFC/40-31-26 Promoting Sustainable Forest Management

Seasoning
Seasons readily by air or kiln drying although there can be some warping due to sloping grain and some care is required to prevent checking in wide boards. Pre-air-drying is recommended. 

Working Qualities
It machines, nails and glues well; takes an excellent polish and holds paint very well. It is also prized as a carving timber. 

Uses
One of the world’s most durable timbers and highly resistant to fire, termite and marine borer attack and impervious to acids. Jarrah has a very wide range of uses, previously regarded as a heavy construction timber for bridges and wharves it is now favoured for interior finishing, joinery, cabinet-making and flooring.

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About the
Seller

ITI NZ, formerly known as ITI Timspec, began as Timspec, a specialist timber wholesaler committed to providing quality timber products with reliable service, value, visuals and versatility. In March 2019, Timspec Ltd was acquired by ITI NZ Ltd, becoming ITI Timspec, before later rebranding to ITI NZ Ltd.

As part of the wider ITI Group, ITI NZ continues to grow its product range and service offering across New Zealand. The acquisitions of Rosenfeld Kidson and Hermpac have further strengthened the business by adding respected industry knowledge, trusted timber brands and a wider range of premium timber solutions.

These acquisitions have also helped expand our offering across cladding, cedar products, flashings, external corners and related timber accessories, allowing us to support architects, builders and merchants with a more complete solution.

ITI NZ sources timber from trusted mills and suppliers around the world and works hard to provide quality products, reliable service and strong relationships across the building industry.

Verified ArchiPro Member10 years · Since 2016