International Timber Solutions

The best indicator for appropriate use of treated pine is "hazard class" as outlined in AS1604 - Timber - Preservative-treated - Sawn and round. The type and degree of attack to which timber may be exposed in service is known as the "hazard". Suitable treatments are defined for each hazard class.

Hazzard Class	Hazzard	Exposure	Suitable Treatment Options	Typical Applications	Location
	Blue stain	Packaged timber during transit	Envelope treatment (clear)	Prevent blue stain of fresh cut timber (no KD) during transit	Global
H1	Insects other than termites -Lyctid and Anobiid attack	Inside, above ground	LOSP	Flooring, furniture, interior joinery	Asia – Pacific
H2-F	Termites and Borers	Inside , above ground	Envelope treatment (blue)	Framing, flooring and similar used in dry situations	South of the tropic of Capricorn only
H2	Termites and Borers	Inside , above ground	CCA, ACQ LOSP (red)	Framing, flooring and similar used in dry situations	Asia – Pacific
H3	Moderate decay, borers and termites	Outside, above ground	CCA, ACQ CuAz, LOSP (clear or green)	Cladding, fascia, pergolas (above ground), joinery, framing, decking	Asia – Pacific
H4	Severe decay, borers and termites	Outside, inground	CCA, ACQ CuAz, Creosote	Fence posts, greenhouses, pergolas (in-ground), landscaping	Asia – Pacific
H5	Very severe decay, borers and termites	Outside, inground, fresh water contact	CCA, ACQ, PEC, Creosote	Retaining walls, piling, House stumps, building poles, cooling tower fill	Asia – Pacific
H6 or H6SW	Marine Borer attack and decay	Marine waters	CCA ,Creosote, PEC	Boat hulls, marine piles, jetty, cross bracing, landing steps & similar	Asia – Pacific

Source: AS1604 - Timber-Preservative-treated-Sawn and round

* Suitable chemicals - these are subject to change based on preservative manufacturers’ recommendations for product treatment and use.

Please note: Treatability varies for different species

Radiata pine is very good in accepting various treatments.

Spruce for instance is very difficult to treat and will not meet the requirements of AS1604 for most currently known treatments.

More details in the Property Guide (434Kb pdf) comparing different pine species.