Classes | Type of wood |
highest: 1 | Ipe | Teak | Camaru | Impregnated wood A class |
2 | Noawood |
Merbau | Chengal | Balau | Iroko | |
3 | Western Red Cedar (WRC) | Siberian Larch | Douglas Fir |
4 | Norway Spruce | Scots Pine | Douglas Fir |
weakest: 5 | Birch | Aspen | European Ash |
Timber in durability class 2 is suitable for exterior applications above ground without the need for further treatment.