This study was carried out to investigate dimensional stability and corrosivity towards metal fasteners in radiata pine (Pinus radiata D. Don) treated with Tanalith® K to Hazard class 4 (H4) retentions in comparison with chromated copper arsenic (CCA) treated timber. For corrosion test, untreated and treated matched specimens were prepared from Australian-grown radiata pine, tested with mild steel and galvanised nails and exposed to outdoor condition for 15 months. Dimensional stability measured by 12 months monitoring dimensional & moisture change as well as visual defects of treated timber exposed to environmental condition. The obtained results showed the least moisture and dimensional change belonged to Tanalith® K treated timber. Tanalith® K treated timber was drier in touch when measuring dimension and weight after rain. Corrosion ratio in CCA treated specimens was 4.8 times more than that of Tanalith® k. Furthermore, weight loss of fasteners especially galvanised nails was higher in CCA treated specimens. Many cracks were seen in CCA treated timber in both corrosion and dimensional stability tests.

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