Osmose Preservation Technology at work: Timber preservatives for treated timber, treated wood, treated pine

Interactive Treated Timber Specifiers Guide

In Australia, there are a number of different timber preservatives produced by Osmose. Each type of preservative can treat timber destined for different applications, however, the way the timber is treated will vary accordingly. To ensure that the correct treatment type and level of treatment is used in an application, a system of Hazard Classes is used according to the definitions in Australian Standards as shown in the table below.

The higher the Hazard Class, the more severe the exposureis, therefore, it is important to purchase preservative treated timber to the correct Hazard Class irrespective of the preservative type. By ensuring you buy preservative treated timber of the correct Hazard Class, irrespective of the treatment type, the same performance can be expected. This means you need to specify the correct Hazard Class for a particular application and ensure that this is marked on the timber that you purchase or your builder uses. There are some restrictions on use of CCA (Copper Chrome Arsenate) in decking and associated posts and handrails, picnic tables, playground equipment and the like, see www.apvma.gov.au for more details.

The interactive treatment guide below, will assist you to determine the correct Hazard Class for the preservative treated timber in your application. Simply point to the circles on each of the products on and around the house.

A print friendly version of the guide can be downloaded simply by this button.

Hazard Class Selection Guide
Hazard class	exposure	specific service conditions	biological hazard	typical uses
H1	Inside, above ground	Completely protected from the weather and well ventilated, and protected from termites	Lyctid borers	Susceptible framing, flooring, furniture, interior joinery
H2	Inside, above ground	Protected from wetting. Nil leaching	Borers and termites	Framing, flooring and similar, used in dry situations
H3	Outside, above ground	Subject to periodic moderate wetting and leaching	Moderate decay, borers and termites	Weatherboard, fascia, pergolas (above ground), window joinery, framing and decking
H4	Outside, in-ground	Subject to severe wetting and leaching	Severe decay, borers and termites	Fence posts, garden wall less than 1m high, greenhouses, pergolas (inground) and landscaping timbers
H5	Outside, in-ground contact with or in fresh water	Subject to extreme wetting and leaching and/or where the critical use requires a higher degree of protection	Very severe decay, borers and termites	Retaining walls, piling house stumps, building poles, cooling tower fill
H6	Marine waters	Subject to prolonged immersion in sea water	Marine wood borers and decay	Boat hulls, marine piles, jetty, cross-bracing, landing steps, and similar
Notes: 1. Examples shown in this table are not exhaustive. 2. It is recommended that specifiers nominate the minimum hazard class level appropriate to the specific exposure and service conditions. 3. Extract from AS1604.1, Specification for preservative treatment © SAI Global.

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