Karri:One of Australia''s Tallest Hardwood with Many Applications
Karri has earned the name the ‘giant tree’ of Western Australia, towering as high as 50 meters. It is one of the tallest Hardwood tree species in the region. It grows very fast and can reach great dimensions. It favors light loamy soils with good depth, which is why Karri loves the high rainfall forests of the southwest portion of Western Australia.
Karri or Eucalyptus diversicolor has a variety of shades from rich reddish brown even a pale pink color, Its sapwood has a very distinct light yellow shade. Its texture is coarse with a substantial amount of interlocking grains.
The heartwood is substantially durable, but it does not accept preservative impregnation . However, its product is not easily manageable partly because of its interlocking grains as well as its high density. The Karri timber product also has restrictions especially when used as structural support in exposed areas. Nonetheless, Karri has extensive uses including flooring, paneling, joinery, sleepers, veneer, boat building, heavy construction and structural framing for houses.
Despite its many applications, Karri is difficult to manage and finish. It has issues with gluing. It may also require pre-drilled for nailing purposes. It does not also adhere well to paints. However, its sapwood is resistant to lyctid borer infestation.
Karri with clearer grades and enormous formats are believed to be from old growth forest. In fact, Karri is still being harvested from old growth and re-growth forests in Western Australia, where the mature trees in plantations are still considerably few. If you are planning to use Karri in your home, make sure you get a secondhand product. Be very selective of your timber merchants because Karri from old growth forests is not a sustainable practice.
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