Teal timber windows and doors timber species types
Teal timber species

Teal Timber Windows Timber Species

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Teal Timber Windows recommends and uses only proven timbers timbers such as Western Red Cedar, PNG Rosewood, Kwila/Merbau.

These timbers are the market leaders in performance and durability. Other timbers species can be used for specific applications and settings.
Western Red Cedar
Ever wondered why so many other products want to imitate Western Red Cedar?

Western Red Cedar combines form and function like no other timber or man-made material. Its unique, natural performance characteristics and exceptional beauty brings warmth, character and longevity to homes and commercial building around the world. It is this set of properties that makes “Cedar” the timber of choice for discerning architects, builders and homeowners around the world.

Western Red Cedar is renowned for its naturally occurring resistance to moisture decay and insect damage. Its natural durability, dimensional stability and exceptional beauty make it ideal for a wide variety of exterior and interior uses. It is lightweight and easy to handle and install for both the professional and DIY persons. Western Red Cedar offers enormous versatility.

Western Red Cedar and the Environment
Western Red Cedar is the ultimate green building material. It is responsibly and sustainably harvested in the publicly managed forests of British Columbia, Canada. The province has exceeded United Nations guidelines by setting aside more than12% of its land base as parkland. Less than 1/3 of 1% of BC,s Cedar growing stock volume is harvested each year. For each tree harvested, three are replanted. There are more forests in North America today then there were 100 years ago. These young forests are excellent carbon sinks. They also release oxygen back into the atmosphere contributing to a healthier environment. Timber, and Western Red Cedar specifically, has the least impact on the environment throughout its life cycle. Western Red Cedar requires significantly less energy to produce than other materials and unlike man-made alternatives, Western Red Cedar is biodegradable. Timber has 400 times better insulation value than steel, 2000 times that of aluminium, 8 times that of concrete.

Why Western Red Cedar windows and doors? They are the ultimate in style, versatility and performance.  Western Red Cedar windows and doors suit the aesthetic requirements of any project. They extend a greater choice of type, colour and style than those made of other materials. PVC and Aluminium are available only in solid colours and imitation wood grain that is foil glued onto a surface. These products are mass-produced in limited variations. A further appeal of Western Red Cedar is the ease with which its appearance may be changed. A timber window may be embellished with a translucent stain or alternatively an opaque satin, gloss colour. Decking stains are hard wearing, semi-transparent, penetrating stain resistant to cracking peeling and blistering. Decking stains adds colour to timber, allowing the creation styles and moods desire for outdoor living spaces. Its oil rich formula is easy to apply and helps protect timber from the destructive effects of weathering. Available in a range of colours, Decking Stain requires only one coat to achieve a semi-transparent matt finish. When the desired colour is achieved a clear coat of finishis applied resulting in a minimum of 3 coats. Similarly a change of fasteners and fitting, whether due to fashion or increased security, is considerably easier with timber windows.                                 

Papua New Guinea Rosewood  
Teal Windows will manufacture almost any product from PNG Rosewood. The timber's popularity is growing at an extremely fast rate. The surface and grain texture is unique in its appearance. Colour varies from pale yellow to golden brown to blood red although the majority of lots are golden brown. This timber is remarkably stable with little natural movement and a low shrinkage rate. Hardness is moderate to high which gives an indication of a species resistance to indentation and abrasion. Timber is very oily which helps give it a very good durability rating and widely used for external joinery and luxury furniture items.

Papua New Guinea Rosewood and the Environment 
Papua New Guinea Rosewood is a hardwood species mainly grown in Papua New Guinea with small quantities also available in the Solomon Islands and Santa Cruz Islands. It is a large tree commonly found in coastal lowland forest areas and on mountain slopes up to about 950m. Reforestation is common practice where removal of trees is occurring. PNG Rosewood is highly prized in Asia and thus only small quantities are available for the Australian market. Timber takes well to staining, oiling and most other finishes.

Teal Windows has been manufacturing windows and doors for many years from Kwila. Production quantities are increasing with its popularity in the joinery market and the addition of Bushfire-prone areas into the Building Code of Australia. (AS 3959-1999) Kwila is the best all-round timber to be using in fire-rated areas due to its availability, durability, stability and many other qualities. This is why Teal recommends Kwila over the other species that meet Australian Standards AS 3959. The texture of Kwila is moderately coarse and displays an even slightly interlocking grain. Vessels are often filled with a yellow or white deposit which is conspicuous on the surface. Colour is brown or deep reddish brown. Kwila is hard and strong with very little shrinkage and movement. Kwila takes well to oil, paint, stain and polishes well but gum bleed-through or oily patches may affect the finish.Refer to the Care page on Teal timber tanning wash for the removal of tannins sometimes called bleeding. Kwila has a very high durability rating and is excellent for manufacturing windows and doors and many other joinery items such as furniture, outdoor settings, shop fittings, flooring, decking and cabinet making.

Kwila/Merbau and the Environment
Kwila is a hardwood species and grows in the Philippines, Thailand, Papua New Guinea, Malaysia, Fiji, Vietnam, Madagascar, Solomon Island, New Caledonia and Samoa. It is a large tree and can be found at sea level and mountain slops up to 850m. Reforestation is common practise were removal of trees is occurring.  


Western Red Cedar
PNG Rosewood
(Sold as Merbau)
(Sold asRed Cedar
or Calantis)
In Ground (Class*)
In Ground (Years)
15 - 25yrs
15 - 25yrs
15 - 25yrs
7 - 15yrs
Above Ground (Class*)
1 - 2
Above Ground(Years)
15 - 40yrs
25 - 40yrs
25 - 40yrs
15 - 25yrs
Shrinkage to 12% moisture content - Tangential
Shrinkage to 12% moisture content - Radial
Termite Resistance
Not resistant
Hardness (1 = Soft 6 = Hard)
Strength Group (seasoned)
Stress Grades
F4, F5, F8
F14, F17
F14, F17, F22, F27
F4, F5, F8
Density at 12% moisture content kgs/m3

Definitions* and Notes

* Natural Durability is the resistance of untreated heartwood to attack by wood destroying fungi, termites & other insects.
- Class 1 - Very Durable. Suitable for long term use in structures exposed to the weather and in contact with the ground.
- Class 2 - Durable. Suitable for unprotected exterior use under normal conditions.
- Class 3 - Moderately Durably. Suitable for protected exterior work and for internal use. Not suitable for use in contact with the ground.
- Class 4- Non Durable. Not suitable for exterior use unless treated with preservative.

* Shrinkage is the amount the timber is reduced in size from when it is cut to when it has dried to a moisture content of 12%.

* Termite resistant. Of the timbers species listed, some are natural more resistant to Termites than others, only the heartwood may be resistant to attack by termites. Local experience should be referred to for specific installations.

*Hardness, gives an indication of a species resistance to indentation and abrasion. It is usually determined by a test called the Janka indentation test which measures the force required to embed a steel ball a certain depth into the wood. The higher the Janka rating the more resistant the timber is to indentation.

*Strength Group is mainly used by engineers to determine the size of structural timber. The strength groups are based on the following five strength properties:
- Air Dry Density is the average density of the timber at a moisture content of 12%.
- Modulus of Rapture is a measure of the bending strength of the timber.
- Maximum crushing strength in compression parallel to the grain.
- Maximum shear strength parallel to the Grain.
A Strength group rating from SD1 to SD8 is given to seasoned timber. The lower the number the stronger the timber.

* Stress Grade indicted is based on the strength group and applies to seasoned timber only.

* Variations may occur within individual timber species.

* Sources:
- Australian Standards AS 5604 - 2005.
- Queensland Government Dpet of Primary Industries. Queenslamd Forest Reseach Institute.