25279 version 1
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Describe metal flashings and penetrations
Level
4
Credits
10
Purpose
People credited with this unit standard are able to demonstrate knowledge of
flashing types and design detail, and flashing materials and folding limits.
They are also able to describe: flashing marking, cutting, and folding; flashing
fixing, jointing, scribing and sealing; flashing intersections, terminations and
corner fabrication; the formation of curved flashings; pattern making for
construction of sheet metal flashings; applications, fitting, and installation of
simple penetrations; and the applications and identification of complex
penetrations.
Subfield
Plumbing, Gasfitting and Drainlaying
Domain
Roofing
Status
Registered
Status date
23 January 2009
Date version published
23 January 2009
Planned review date
31 December 2013
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
The Skills Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0227
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Legislation relevant to this unit standard includes but is not limited to – Health and
Safety in Employment Act 1992, Building Act 2004.
2
Reference
The NZ Metal Roof and Wall Cladding Code of Practice, 2008 is available from the
New Zealand Metal Roofing Manufacturers Inc – http://www.metalroofing.org.nz.
 New Zealand Qualifications Authority 2016
25279 version 1
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3
The following applicable document is available for download on the Department of
Building and Housing website: http://www.dbh.govt.nz/
– Building Code compliance document Clause E2, containing Acceptable Solution
E2/AS1 for External Moisture.
4
The New Zealand Building Code (NZBC) is a schedule to the Building Regulations
1992. It provides requirements for compliance with the Building Act 2004 when
constructing a new building or altering an existing one. The Building Code sets out
performance standards that building work must meet and covers aspects such as
structural stability, fire safety, access, moisture control, durability, and services and
facilities.
5
Definitions
Industry practice – sound industry practice that meets legislative requirements.
Job specifications – refer to the documented information found in construction
drawings, project specification documents, legislation, regulations and codes.
6
This unit standard may be assessed against off-job.
Elements and performance criteria
Element 1
Demonstrate knowledge of flashing types and design detail.
Performance criteria
1.1
Flashing types are identified and their use described in accordance with
industry practice.
Range
flashing types – transverse, vertical, ridge, rib cap, barge, apron,
chase, valley, parapet, wall jointer, T, window jamb, corner, head,
step, sill.
1.2
Flashings are described in terms of cover, lap, and edge detailing.
1.3
Overall flashing plans and specifications for all flashings on a building are
described in accordance with job specifications.
1.4
Sectional flashing drawings and specifications are described in accordance with
job specifications.
Element 2
Demonstrate knowledge of flashing materials and folding limits.
Performance criteria
2.1
Metal flashing materials and thicknesses are identified in accordance with
industry practice and the NZBC.
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2.2
Maximum unstiffened distance is identified and described in accordance with
job specifications.
2.3
Bend radius limitations are described in accordance with industry practice.
Element 3
Describe flashing marking, cutting, and folding.
Performance criteria
3.1
Description includes layout to minimise wastage.
3.2
Description includes fold and cutting marks according to industry practice.
3.3
Description includes index marks to facilitate correct installation placement.
Element 4
Describe flashing fixing, jointing, scribing, and sealing.
Performance criteria
4.1
Fixing is described in terms of primary, secondary, and clip fastening.
4.2
Description includes fastening spacing in accordance with industry practice.
4.3
Description includes lap fixing in accordance with industry practice.
4.4
Description includes expansion joint installation in accordance with industry
practice.
4.5
Method for scribing a flashing to fit over ribs is described in accordance with
industry practice.
4.6
Pan clearances for scribed flashings are described in accordance with industry
practice.
4.7
Surface preparation, sealant application, and clean-up are described in
accordance with industry practice.
Element 5
Describe flashing intersections, terminations, and corner fabrication.
Performance criteria
5.1
Intersections and joins between flashings are described in accordance with
industry practice.
Range
valley, hip ridge, barge ridge, internal barge, apron and parapet,
apron and ridge.
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25279 version 1
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Element 6
Describe the formation of curved flashings.
Range
jennied, lock seamed, crimped.
Performance criteria
6.1
Description includes the purpose of curved flashings.
6.2
Description includes the forming of curved flashings in accordance with industry
practice.
Element 7
Describe pattern making for construction of sheet metal flashings.
Performance criteria
7.1
Description includes method of transferring information and marking out a
pattern for a flashing in accordance with industry practice.
7.2
Description includes method of folding pattern and transferring information to
the flashing sheet metal in accordance with industry practice.
Element 8
Describe the applications, fitting, and installation of simple penetrations.
Range
penetrations requiring no additional support and sealed with a pre-fabricated
boot or collar flashing.
Performance criteria
8.1
Description includes simple penetration applications on sheet metal roof and
wall cladding.
8.2
Description includes fitting and preparation processes for sheet metal roof and
wall cladding.
8.3
Description includes final installation fixing and sealing in accordance with the
NZBC and industry practice.
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Element 9
Describe the applications and identification of complex penetrations.
Range
soaker under flashings, watershed flashings, tapered flashings, soaker (tray)
flashings.
Performance criteria
9.1
Description includes complex applications on sheet metal roof and wall cladding
in accordance with industry practice.
9.2
Description includes identification of complex penetration types.
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 Skills Organisation info@skills.org.nz if you wish to suggest changes
to the content of this unit standard.
 New Zealand Qualifications Authority 2016