25291 version 1
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Explain roof membrane installation, re-roofing considerations, and
potential problems
Level
4
Credits
6
Purpose
People credited with this unit standard are able to explain: how temperature
and humidity may affect roof bonding adhesives; a ballast roof installation;
the use of bond breaker release tape and detail tape on roof membrane; lap
bonding requirements and causes of failure; detail for mounting and fastening
plant to roof membrane; and the considerations for restoration of faulty roof
membrane.
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
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.
 New Zealand Qualifications Authority 2016
25291 version 1
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3
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.
4
Definitions
Industry use – common use in the roofing industry.
Job specifications – refer to the documented information found in construction
drawings, project specification documents, legislation, regulations and codes.
Manufacturer recommendations – refer to product information and product data
sheets provided by the manufacturer of any given product.
Elements and performance criteria
Element 1
Explain how temperature and humidity may affect roof bonding adhesives.
Performance criteria
1.1
The potential effects of temperature and humidity on uncured adhesive is
explained in terms of solvent evaporation.
1.2
The potential effects of temperature and humidity on uncured adhesive is
explained in terms of solvent entrapment.
Element 2
Explain a ballast roof installation.
Performance criteria
2.1
The principles of a ballast roof and installation are explained in accordance with
manufacturer recommendations.
Range
joins, manufacturing, bonding.
Element 3
Explain the use of bond breaker release tape and detail tape on roof membrane.
Performance criteria
3.1
The purpose and use of bond breaker release tape is explained in accordance
with the NZBC Acceptable Solution E2/AS1.
3.2
The purpose and use of detail tape is explained in terms of industry use and
manufacturer recommendations.
 New Zealand Qualifications Authority 2016
25291 version 1
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Element 4
Explain lap bonding requirements and causes of failure.
Performance criteria
4.1
Lap bonding requirements are explained in accordance with NZBC Acceptable
Solution E2/AS1.
4.2
Causes of failure are explained in terms of incorrect practical application and
material use.
Element 5
Explain detail for mounting and fastening plant to roof membrane.
Performance criteria
5.1
Detail of mounting structure, membrane coverage and fastening placement are
explained in accordance with manufacturer recommendations.
Element 6
Explain the considerations for restoration of faulty roof membrane.
Range
faults may include – poor installation or deterioration;
restoration includes – localised repair, total replacement.
Performance criteria
6.1
Roof inspection activities are explained in terms of determining existing
condition and potential hazards prior to repair or replacement.
6.2
Importance of work planning sequence is explained in terms of minimising
impact to occupants and potential risks of exposure damage to building.
6.3
Considerations for determining the extent of membrane repairs or replacement
are explained in accordance with industry use.
6.4
Solutions for membrane repairs or replacement are proposed in accordance
with manufacturer recommendations and the NZBC.
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.
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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