13002 version 3

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Demonstrate knowledge of timber used in construction

Level / 3
Credits / 2

Purpose People credited with this unit standard are able to: identify timbers and describe their uses; describe features of timber grading; describe features of timber seasoning; identify causes of timber deterioration and describe preventative measures; and explain timber preservation.

Subfield / Construction Trades
Domain / Carpentry Theory
Status / Registered
Status date / 25 January 2008
Date version published / 25 January 2008
Planned review date / 31 December 2012
Entry information / Open.
Replacement information / This unit standard replaced unit standard 603.
Accreditation / Evaluation of documentation and visit by NZQA and industry.
Standard setting body (SSB) / Building and Construction Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference / 0048

This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.

Special notes

1 Credit for this unit standard indicates compliance with industry practice. Industry practice refers to the ability to demonstrate knowledge that reflects the uniformity, finish quality and material economies currently accepted within industry.

2 Legislation and standards relevant to this unit standard include:

Health and Safety in Employment Act 1992 and Health and Safety in Employment Regulations 1995;

Building Act 2004;

New Zealand Building Code;

Resource Management Act 1991;

NZS 3604:1999 Timber Framed Buildings, NZS 3631:1988 New Zealand timber grading rules and NZS 3640:2003 Chemical preservation of round and sawn timber; available from Standards New Zealand (http://www.standards.co.nz).

Elements and performance criteria

Element 1

Identify timbers and describe their uses.

Performance criteria

1.1 Timbers are identified and described in terms of their species, characteristics, common usage and resource sustainability.

Range indigenous, exotic, imported timbers.

1.2 Timber is described in terms of its length, size and finish.

Range rough sawn, gauged, dressed, finger jointed, profiles.

Element 2

Describe features of timber grading.

Performance criteria

2.1 Grades of indigenous and exotic timber are defined in terms of New Zealand Standard timber grading rules, and their application in the building industry.

Range visually graded, machine stress graded.

2.2 Common defects in indigenous, exotic and imported timbers are described in terms of how these affect timber use.

Range knots, splits, checks, shakes, warps.

Element 3

Describe features of timber seasoning.

Performance criteria

3.1 Terms are defined in relation to timber seasoning.

Range fibre saturation point, equilibrium moisture content, moisture content.

3.2 Methods used to determine moisture content of timber are described.

Range oven dry method, moisture meter.

3.3 The seasoning of timber is explained in terms of the method used.

Range stacking methods; seasoning methods including – air, forced air, low and high temperature kilns.

Element 4

Identify causes of timber deterioration and describe preventative measures.

Performance criteria

4.1 Common forms of insect attack are identified and described in terms of the resulting deterioration of timber.

Range common house borer, two-tooth longhorn borer, pin hole borer.

4.2 Common forms of fungal attack are identified and described in terms of the resulting deterioration of timber.

Range dry rot, wet rot.

4.3 Environmental causes of timber deterioration are identified and described.

Range ultra violet light, mechanical abrasion, moisture fluctuations, bacteria, chemicals, storage and stacking.

4.4 Actions required to prevent deterioration in timber are identified and described.

Range deterioration caused by – insect attack, fungal attack, environmental conditions.

Element 5

Explain timber preservation.

Performance criteria

5.1 Preservative treatment of timber and associated health and safety requirements for handling and disposal are explained.

Range boron salts, pressure treated boron with glycol, copper-chrome-arsenate, copper base chrome and arsenic free, light organic solvent preservatives, chemical free.

5.2 Treated timber is described in terms of its identification, use, care and handling.

Please note

Providers must be accredited by NZQA, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.

Industry Training Organisations must be accredited by NZQA before they can register credits from assessment against unit standards.

Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards.

Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

Comments on this unit standard

Please contact the Building and Construction Industry Training Organisation if you wish to suggest changes to the content of this unit standard.

Ó New Zealand Qualifications Authority 2008