Recent export figures show an increase of 2 per cent in both value and volume of exports of American hardwood lumber in January - June 2012 relative to the same period in 2011, say the American Hardwood Export Council (AHEC).

Whilst Ash currently only accounts for a small proportion of all exports, it’s a hardwood that is appearing in recent projects around the country, particularly in its thermally modified form, according AHEC.

Thermally modified timber

Thermally modified hardwoods are hardwoods that have been subjected to high temperatures in a controlled environment, the result being a permanent alteration of the wood’s chemical and physical properties.

The thermally modified wood does not absorb moisture and is more dimensionally stable than in its pre-modified state. In situ, the wood is less prone to warping and twisting with changes in humidity. The thermal modification process also removes any nutrients in the wood thereby removing any food source for insects and fungi making it decay resistant.

Queensland based Duce Windows and Doors recently completed a full conversion of an old beach side brick shed into a retro style beach house on Stradebroke Island (pictured). Thermally modified ash was recommended by Duce for all external joinery primarily for the contrasts in colour and grain to suit the year round beachside climate.

AHEC notes that working with thermally modified hardwood is not without its challenges as it can be more brittle than other woods. However its resistance to decay and dimensional stability means that the life of applied finishes is lengthened and maintenance needs are significantly reduced.

Dominic McNeil from Britton Timbers says thermally modified timbers will continue to see growth and particularly ash:

“I feel ash will be a species that will be used more in Australia going forward. Well priced, great colour and grain and is available in all thicknesses”.

Roderick Wiles, AHEC Director for Oceania agreed:

“I’m not surprised by the interest in thermally modified ash in Australia. The Australian love of the outdoors is second to none and the need for products that look great but can also withstand the elements makes perfect sense. These initial signs are very encouraging indeed”.

Photo: Duce Timber Windows and Doors, Bundamba, Qld

Architecture & Design Team

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