All our timber is CCA treated:

Chromated copper arsenate (CCA) is a wood preservative that has been used since the mid-1930s. It is a mix of chromium, copper and arsenic (as Copper(II) arsenate) formulated as oxides or salts, and is recognizable for the greenish tint it imparts to timber.

CCA Treatment has different hazard classes:
• H2 – Interior use e.g: Beams, Roof trusses.
• H3 – Exterior above ground e.g: Laths, Droppers, Fencing Rails.
• H4 – Exterior ground contact e.g: Fencing, Building, Agriculture.
• H5 – Fresh water contact e.g: Irrigation, Jetties.
• H6 – Marine water contact e.g: Jetties, Walkways.