tags: #publish links: [[Property Resources]], [[Gardening and Landscaping Resources]] created: 2020-09-23 Wed --- # Arsenic-treated timber - Copper Chrome Arsenate (CCA) - Used to be used for weatherproofing exterior timber - Must not drill, sand or burn - Not really a risk of leaching into soil - Somewhat termite and borer resistant - No longer permitted for residential uses in Australia, but don't have to replace existing uses. Not actually restricted in NZ It's no longer considered suitable for water-/flood-exposed uses anyway: from a flood assessment document in a DA: > **Ancillary Structures (steps, pergolas etc)**: Suitable water-tolerant materials, such as masonry sealed hardwood and corrosive resistant materials, should be used. Copper Chrome Arsenate (CCA) treated timber is not suitable material.