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Termite Management for Builders |
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Page 17 of 20 Appendix A – Termite Resistant TimbersThe timbers listed below represent a summarised account of those in AS3660.1 (2000) and have been guided by commercial availability in different locations iin Australia.
Timbers exhibiting natural resistance to subterranean termites in Australia do so with a number of conditions attached. Detailed conditions are in AS3660.1 but some notable aspects are that:
- Resistance relates to the heartwood only.
- Resistance varies from tree to tree as well as within the same tree.
- Resistance will be better for timber used above ground compared to below ground.
- Different timber species have different levels of resistance to various species of termite.
Table 3: Naturally Resistant Australian Hardwoods
| Red bloodwood
Spotted gum
White mahogany
New England blackbutt
Forest red gum
Coast grey box
Southern mahogany
River red gum
Grey gum
Gympie messmate
Jarrah
Tallowwood
Grey box
Stringybark
Grey ironbark
Blackbutt
Red mahogany
Red ironbark
Forest red gum
Brush box
Turpentine
Cypress (Australian) |
Timbers treated against termite attack must attain appropriate levels of treatment to suit the application involved. Further details are in AS1604 but a selection guide is shown below: Application
| Treatment Level
| | Interior, above the ground | H2 or H2F* | | Exterior, above the ground | H3 | | Exterior in ground contact | H4 or H5**
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NOTES:
* H2F is only resistant to termites below the Tropic of Capricorn.
** Use H5 where ground water is present.
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