Classification of Natural Durability of Timber
Reference: Australian Standard No 5604, Timber - Natural Durability ratings,2003
| Class | Probable in-ground life expectancy (years) | Probable above ground life expectancy (years) |
|---|---|---|
| 1 | >25 | >40 |
| 2 | 15-25 | 15-40 |
| 3 | 5-10 | 7-15 |
| 4 | 0-5 | 0-7 |
NOTE: Classifications are a guide with the actual life dependent on the local ground conditions and other factors.