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Lay natural stone, slate or tiles as hard surfaces in landscape work

Level / 4
Credits / 6

Purpose This unit standard is for people working, or intending to work, in landscaping. People credited with this unit standard are able to: prepare work area for laying of natural stone, slate or tiles; lay concrete base as hard surface for stone, slate, or tile as hard surface; select and set out stone, slate, or tile for hard surface; mix and lay bedding mortar; and lay stone, tile, or slate as hard surface.

Subfield / Horticulture
Domain / Landscape
Status / Registered
Status date / 25 September 2006
Date version published / 25 September 2006
Planned review date / 31 December 2011
Entry information / Open.
Accreditation / Evaluation of documentation and visit by NZQA, industry and teaching professional in the same field from another provider.
Standard setting body (SSB) / Primary Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference / 0032

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

Special notes

1 Workplace procedures refer to verbal or written instructions to staff on procedures for the worksite and equipment.

2 Legislation relevant to this unit standard includes but is not limited to the Health and Safety in Employment Act 1992.

3 The New Zealand Standards applicable to this unit standard are: NZS 3109:1997 Concrete construction, NZS 3113:1979 Specification for chemical admixtures for concrete, and NZS 4229:1999 Concrete masonry buildings not requiring specific engineering design, available from http://www.standards.co.nz.

Elements and performance criteria

Element 1

Prepare work area for laying of natural stone, slate or tiles.

Performance criteria

1.1 Excavation for the work is completed in accordance with workplace procedures and in accordance with the requirements of the drawings and specifications.

1.2 Edgings for the work are established to height, line, and grade shown on drawings and are in accordance with the specification and manufacturer's requirements where applicable.

1.3 Base is laid, compacted, and finished to line and grade required for hard surface finish in accordance with specifications shown on drawings and workplace procedures.

Element 2

Lay concrete base for stone, slate, or tile as hard surface.

Performance criteria

2.1 Base course is laid to specification or site requirements and in accordance with workplace procedures.

Range specified level below finish level, to line and grade, evenly compacted.

2.2 Edgings are established to ensure that the grade on the final surface runs water off to defined drainage points.

Range minimum grade of 15 mm per metre for general use, minimum grade of 25 mm per metre away from buildings.

2.3 Reinforcing requirements are calculated from drawings or specifications and ordered in accordance with workplace procedures.

Range at least two of – reinforcing pre-bent to shape and size; unbent reinforcing bar by size and lineal measure; welded steel fabric by gauge, mesh size, and area.

2.4 Unbent reinforcing is cut and bent as shown in drawings and in accordance with NZS 3109:1997, using tools in accordance with workplace procedures.

Range two of – bolt cutters, steel rod cutter, steel bender.

2.5 Reinforcing is placed to detail, and secured using the method specified for the work.

Range wire ties, spacing blocks or stools, lapping.

2.6 Concrete materials requirements calculated from drawings or specifications are ordered in accordance with workplace procedures.

Range cement by the bag or tonne, aggregate for site mix by cubic metre and aggregate size, ready mixed concrete by cubic metre and test strength.

2.7 Concrete made on site is mixed in accordance with the requirements of NZS 3109:1997.

2.8 Concrete is placed without segregation of aggregate, damage to edgings, or displacement of reinforcing steel.

2.9 Concrete is compacted using hand or vibrating screed to achieve line, grade, and density of surface finish detailed in drawings and specification.

2.10 Partly dry concrete surface is roughened to provide bonding key for bedding mortar.

2.11 Surface is protected, and concrete is cured using methods which prevent foot and vehicular access, retain moisture, and enable the concrete to reach its optimum strength.

2.12 Site is left in condition which allows further work to proceed unimpeded and in accordance with workplace procedures.

Element 3

Select and set out stone, slate, or tile for hard surface.

Range one of – stone, slate or tile.

Performance criteria

3.1 Stone, tile, and slate commonly used as hard surfaces in landscape are described in terms of the uses and characteristics.

Range characteristics – surface texture, sources, hardness, dimensions; three types of – stone, tiles and slate.

3.2 Material requirements are calculated from drawings or specifications, and are ordered by type, size specified, and area to be covered.

3.3 Material set out is established using measurement and lines to provide laying pattern specified in drawings or to achieve a balanced result in accordance with workplace procedures.

Range edge sizes, distribution of random sized material, colour distribution.

Element 4

Mix and lay bedding mortar.

Range one of – stone, slate or tile.

Performance criteria

4.1 Mortar materials are selected to meet the requirements of the site specification and NZS 4229:1999.

4.2 Mortar is mixed to the requirements of NZS 4229:1999.

4.3 Admixtures included in the mortar mix to enhance adhesion conform to the requirements of NZS 3113:1979.

4.4 Surface of concrete base slab is thoroughly cleaned and lightly wetted to enhance mortar adhesion before mortar is laid.

4.5 Placement of bedding mortar on concrete base slab ensures that a good bond is achieved in accordance with workplace procedures.

4.6 Unlaid mortar is covered to prevent moisture loss, and is discarded if not used before initial set takes place.

Element 5

Lay stone, tile, or slate as hard surface.

Range one of – stone, slate or tile.

Performance criteria

5.1 Full sections of stone, tile, or slate are laid to detail shown on drawings or in specification.

Range detail – pattern, line and height, joint size and evenness, surface variation, expansion joints or flexible jointing compound.

5.2 Stone, tile, or slate is cut and fitted to complete the hard surface, using hand and mechanical methods without damage or danger to the operator or others, and in accordance with workplace procedures.

Range one of – hammer and bolster, power saw with specialist blade, specialist water lubricated saw, proprietary tile cutter.

5.3 Mortar is kept off finished surface.

5.4 Joints are tooled to profile detailed in drawings or specification using bedding mortar, or raked out for future pointing in accordance with workplace procedures.

5.5 Raked out joints are filled with pointing mix which meets the requirements of NZS 4229:1999 after the bedding mortar has set, and is tooled to the profile detailed in drawings or specification.

5.6 Hard surface is cleaned down after pointing is set, using the acid solution specified for the work and washed clear with water on completion.

5.7 Acid is handled, stored, and applied safely.

5.8 Sealant is applied to the manufacturer's requirements and in accordance with workplace procedures.

5.9 Site is left in a condition which allows further work to be undertaken unimpeded in accordance with workplace procedures.

Please note

Providers must be accredited by the Qualifications Authority, 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 the Qualifications Authority 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 Primary Industry Training Organisation www.primaryito.ac.nz if you wish to suggest changes to the content of this unit standard.

Ó New Zealand Qualifications Authority 2013