One of the most important things for Landscaping is Durability. We have listed out different types of timbers and their character, grouped by colour below. It is worth noting that sapwood is not durable at all when talking about the durability, we are referring to the heartwood. Occasionally some boards will have a small amount of sap on the edge and this will either needed to be removed prior to use or it will eventually rot.
All timber, if left outside uncoated, will naturally turn a silvery-grey colour. This is a natural process as the outer layers of the timber cellulose get exposed to the weather.
The timber will also, split, check and warp, but depending on the species this may not be too noticeable. One way to reduce weathering and distorting of timber is to coat it with a protective product, Refer to our Coatings page for outdoors.
One of the main things to consider when trying to decide whether to coat your timber or leave it to weather naturally is, if you are willing to maintain periodically. All exterior coatings will need maintenance on an annual basis (usually just a good clean), and they will require recoating every 6 months to 5 years, depending on the coating and its exposure to the elements.
Timbers Suitable for Exterior Use
|Colour ||Timber ||Durability |
|Yellow ||Yellow Cedar ||Very Durable |
|Yellow / Light reddish-brown ||Balau ||Durable |
|Golden yellow / Light brown ||Macrocarpa ||Moderately Durable above ground |
|Golden yellow / Light brown ||Oregon ||Moderately Durable |
|Golden yellow / Light brown ||Totra ||Very Durable |
|Light Pink ||Taun ||Moderately Durable |
|Pink ||Saligna ||Durable above ground |
|Pink / Light brown ||Cedrela ||Durable |
|Light brown ||Sapele Mahogany ||Durable |
|Light brown ||Vitext ||Durable |
|Light brown ||Western Red Cedar ||Durable |
|Straw brown ||Pilularis (Black Butt) ||Durable |
|Medium brown ||Teak ||Very Durable |
|Grey to Reddish/dark brown ||Spotted Gum ||Durable |
|Yellow, fading to Dark brown ||Iroko ||Durable |
|Red, fading to Dark Brown ||Bubinga ||Durable |
|Red/Redish-brown, fading to Dark Brown ||Jarrah ||Durable |
|Red/Redish-brown, fading to Dark Brown ||Padauk ||Durable |
|Red/Redish-brown, fading to Dark Brown ||Rosewood ||Very Durable |
|Red/Redish-brown / Dark Brown ||Kwila ||Durable |
The heartwood is yellowish-brown, brown or dark red, red-brown, turning to a dark red-brown with age. The wood is hard and heavy, the texture is moderately coarse but even and the grain may be straight or interlocked and is often wavy. Sulphur-yellow and dark colored deposits are characteristic of the species and can be commonly seen in the vessel cavities.
Sustainability: This wood species is not listed in the CITES Appendices, but is on the IUCN Red List. It is listed as vulnerable due to a population reduction of over 20% in the past three generations, caused by a decline in its natural range, and exploitation.
We do not recommend acrylic coating, since it changes the natural color. See Jarrah.
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The timber dries slowly without appreciable degrade but if submitted to rapid drying conditions, there is a definite tendency for end splitting and surface checking to occur. It has a low shrinkage factor.
Saws well, however, with the fairly high incidence of gum, saws tend to become clogged. It planes well but there is a tendency for the grain to tear out in quarter-sawn material. A reduction in the cutting angle to 20º is beneficial. The wood tends to split when nailing but holds screws well and can be stained and polished reasonably well, however, patches of oil that exude may affect the finish. The yellow deposits are soluble in water and the dye produced does stain. If, however, early attention is given to any staining it can generally be removed by scrubbing with milk or lactic acid.
Very good heavy construction timber. Ideally suited for decking and outdoor furniture. It is also used in internal joinery and flooring, striking tool handles and carving.
Available ex-stock in Kiln Dried sizes from 100x25 to 300x50mm, and Air Dried sizes 75x75 to 300x75mm
|Durability Above Ground:
|Density Air Dry:
0 - 2.0
1.0 - 3.0
|Stability Kiln Dry:
|Modulus of Rupture:
|Modulus of Elasticity:
|Max Crush Strength:
Phone our sales team on (09) 620-0260 or Email us anytime, we'd be happy to help.