Healthy Environment, Healthy Community, Healthy Business

Environment Protection Authority

Environmental Issues

Chemicals and pesticides

Codes, labels and branding

Timber preserved to Australian Standards is branded so that buyers and users can identify which company manufactured it, the preservative treatment used and the hazard level it is suitable for.

Special labelling is required for CCA treated timbers.

codes for treated timber labels graphic

Treated timber label codes

Hazard levels

In Australia six main hazard (H) levels help you choose the most appropriate timber for the job. The levels are determined by the environment the timber is to be placed in (interior, exterior, above ground, in ground, in fresh water or in salt water), the types of pests the timber is exposed to and its intended use. Hazard levels are defined by Australian Standard 1604.1.

H levels are also determined by chemical type and strength, penetration depths and retention rates. 

See the Hazard level and treatment types chart for more information.

Suffix code

A suffix code on treated timber labels describes the intended use of some timbers within a nominated H level: F for framing; S for LVL beams, or A for painted LOSP products placed outdoors.

Chemical codes

The chemicals and chemical compounds used to treat timbers can be identified by the number in the middle of the label or brand.

See the Hazard level and treatment types chart for more information.

Manufacturer number

The first number on treated timber labels refers to the manufacturer of the product. See the Timber Preservers Association of Australia (TPAA) comprehensive list of manufacturers.

CCA treated timber

CCA treated timber in Australia must be marked with the words ‘Treated with copper chrome arsenate’ either in the form of individual labels fixed to the ends of wood, or as brands along its length.

Individual items of CCA treated timber such as fence palings, battens, droppers, pieces less than 15mm thick or with a cross section below 1500mm2 don’t  need to be individually labelled, but the packaging must be marked.

Page last updated: 12 May 2016