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Response from Mitre 10: Radiata pine has different preservative treatments according to the environmental hazard that it comes in contact with. For example:
H1 = Low decay hazard. This includes timber used for framing, interior lining and trim.
H3 = Moderate decay hazard. Timber is exposed to weather but not in ground contact. eg. Fence rails.
H4 = A high decay hazard. Timber is exposed to the ground and fresh water. For example: sawn timber, fence posts, retaining walls, horticultural poles.
H5 = Severe decay hazard, eg. building piles and poles
H6 = A marine hazard or water immersion, eg. marine piles.
This is a guideline of the hazard classes and the appropriate preservative treatment required. If you are in any doubt about which treatment you require, please contact your local Mitre 10 store and ask for advice.
Limitation of Liability The information provided here is a general guideline only, based on the limited information that had from
your email, and is not intended to be an exclusive solution. There may be other options and products available that are suitable for your purposes too.
Please discuss your product requirements with the experienced staff in Mitre 10 stores. Always adhere to the manufacturer's directions and precautions
when using their product. Check with your council that you comply with the local body bylaws that pertain to any construction project and consult a
qualified tradesperson where expert services are required.