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Elements and Performance Criteria

1. Determine preservation requirements for timber
   • Identify service requirements for preservation of timber.
   • Identify required chemical retention rates and calculate suitable solution strengths.
   • Identify penetration pattern of timber for treatment.
2. Decide on appropriate preservation technique/s for timber
   • Investigate options for preservation techniques for job requirements and their environmental impact.
   • Review and compare options for suitability and value.
   • Select most appropriate preservation technique.
   • Identify and follow water management procedures.
   • Develop contingency management plans.
   • Implement quality assurance procedures for preserving timber.
   • Implement environmental monitoring procedures.

Range Statement

Not Applicable

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Performance Evidence

A person demonstrating competency in this unit must satisfy all of the elements, performance criteria and foundation skills of this unit. If a specific volume or frequency is not stated below, then evidence must be provided that the following requirements have been performed on at least one occasion:

follow organisational procedures for selecting timber preservation techniques

select the most suitable preservation technique for different types of timber considering chemical retention rates and preservation patterns.

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Knowledge Evidence

A person competent in this unit must be able to demonstrate knowledge of:

organisational procedures for preserving timber and selecting timber preservation techniques

environmental risks and hazards associated with different preservation techniques

timber preservation chemicals and their safe use and storage

timber preservation techniques including:

full cell (Bethel) process

empty cell process

rueping process

double treatment

boultonising

Australian Standards for timber preservation and market requirements, particularly Australian Standard (AS) 1604.1-2010 Specification for preservative treatment - Sawn and round timber and in Queensland, the Queensland Timber Utilisation and Marketing Act

service requirements including:

treated timber hazard ratings

marine borer hazard ratings

timber durability ratings

chemical retention rate/s including the amount of preservative retained in a piece of timber after treatment and fixation have taken place, and must be expressed as either weight for volume or weight for weight.

preservation patterns including the distribution of preservative within the cross section of a treated piece of timber.

water management procedures including consideration of:

ground water monitoring

bund storages

contaminated water containment

contaminated water reuse

drip pads

contingency plans including consideration of:

chemical handling and spill procedures

groundwater leakage procedures

fire suppression procedures

emergency evacuation procedures

environmental monitoring procedures including monitoring of:

groundwater

chemical disposal

residue disposal

dust

noise

types of tools and equipment, used for timber preservation and their safe use and maintenance.

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