Levels of Treatment

Levels of Treatment:

View the table below to understand the levels of treatment, typical uses and solutions.
If you would like more information on the levels of treatment, please visit the Timber Preservers Association of Australia website.

HAZARD CLASS	EXPOSURE	SPECIFIC SERVICE CONDITIONS	BIOLOGICAL HAZARD	TYPICAL USES	TREATMENT OPTIONS
H1	Inside, above ground	Completely protected from the weather and well ventilated and protected from termites	Lyctid Borer	Framing Flooring Furniture Interior joinery	Not available
H2	Inside, above ground	Protected from wetting, Nil leaching	Borers and termites	Framing Flooring Structural materials Plywood Flooring Lintel Bearers Joists and beams Used in dry situations	H2 TRU-CORE Red
H3	Outside, above ground	Subject to periodic moderate wetting and leaching	Moderate decay, borers and termites	LVL/Plywood (glue-line treatment) Decking Posts Framing Hand rails Subfloor timbers Joists Fascia Window componentry Weatherboards Cladding Pergolas Veranda Door frames and sills	H3 TRU-CORE Green H3 TRU-CORE Clear
H4	Outside, in-ground contact	Subject to severe wetting and leaching	Severe decay, borers and termites	Highway noise attenuation walls (plywood) Subfloor timbers Fence posts Greenhouses Pergola posts (in-ground) and landscaping timbers	Not available
H5	Outside, in-ground contact, 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	Not available
H6	Marine waters	Subject to prolonged immersion in sea water	Marine wood borers and decay	Boat hulls Marine piles Jetty cross Bracing	Not available

Additional Information:
Australian-Standards Compliant: The TRU-CORE^® Process is used to treat timber to meet the AS1604, H2 treatment standard. To meet this treatment Standard the TRU-CORE^® Process has been used to apply the well-known preservative Permethrin. Refer to AS1604, H2 for penetration requirements. The TRU-CORE^® Process provides greater penetration for durability.

Guide to Treatment