Technical Statement
Product Description
Scope of use
Multirib® is a wall and roof cladding with a medium
rib-height asymmetric trapezoidal roofing profile for non-specifically designed
timber framed buildings designed and constructed in accordance with B1/AS1,
NZS3604 and E2/AS1, non-specifically designed steel framed buildings to NASH
3405, and specifically designed buildings in accordance with B1/VM1 and AS/NZS
1170.
When
used as a roof cladding:
- Multirib® may be used with a
minimum roof gradient of 3 degrees
When used as a wall
cladding:
- Multirib® must be fixed horizontally
over a nominal 20mm drained cavity where the Risk Score is 0-20.
- Specific design is
required where the Risk Score is greater than 20,
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B1 Structure: Performance B1.3.1, B1.3.2, B1.3.3(a), B1.3.3(b), B1.3.3(c), B1.3.3(f), B1.3.3(g), B1.3.3(h), B1.3.4
- Clause B2 Durability: Performance B2.3.1(b), B2.3.2
- Clause C3 Fire affecting areas beyond the fire source: Performance C3.7, C3.7(a)
- Clause E2 External moisture: Performance E2.3.1, E2.3.2
- Clause F2 Hazardous building materials: Performance F2.3.1
Notes
The product will,
when installed using the details in the Multirib® Profile Technical Summary, meet the following provisions of the
building code:
- Clause
B1 Structure: Performance B1.3.1; B1.3.2; B1.3.3 for the relevant physical
conditions of a) self-weight, b) imposed gravity loads arising from use, (c)
temperature, (f) earthquake, g (snow) and h) wind; B1.3.4
- Clause
B2 Durability: Performance B2.3.1(b); B2.3.2
- Clause
C3 Fire Affecting Areas Beyond the Fire Source: Performance C3.7 Multirib® is non-combustible and contributes to
C3.7a)
- Clause
E2 External moisture: Performance E2.3.1, E2.3.2 Multirib® complies
with E2/AS1 if the roof gradient is 3 degrees or greater, and complies with
E2/AS1 as a wall cladding when fixed horizontally over a nominal 20mm drained cavity where the Risk Score is 0-20
- F2
Hazardous Building Material: Performance F2.3.1
Evidence
The product meets the requirements set out in the following documents, or relevant parts of cited standards within the documents:
- Acceptable
Solution for External Moisture E2/AS1
- Verification
Method for Structure B1/VM1
- Acceptable
Solution B1/AS1
- Verification
Method C/VM2
- AS/NZS
2728: 2013
- NZ
Metal Roof and Wall Cladding Code of Practice Version 2.2/2012 (MRM Code of Practice)
- Tested
for wind loads to AS4040.2: 1992 Methods of testing sheet roof and wall
cladding Resistance to wind pressures for non-cyclone regions.
Supporting evidence
The product has and can make available the following additional evidence to support the above statements:
Use in Service History
Multirib® Profile Technical Summary
Test information available for our coil supplied by NZ Steel and
Pacific Coilcoaters, and past history of in-service use of metal long run
roof and wall cladding within New Zealand.
Product Criteria
Design requirements
For fixings and
fixing patterns, refer to the Roofing Industries Multirib® Profile Technical Summary, which is to be
read in connection with E2/AS1, and the NZ Metal Roof and Wall Cladding Code of
Practice.
E2/AS1 states that
the use of the manufacturers information may provide a more optimum spacing of
fixings, and this is recommended by Roofing Industries.
For purlin sizes,
spacing and fixing, refer to NZS 3604 for Timber Framed buildings and NASH 3405
for Steel Framed Houses.
The substrate and
coating system must be as recommended by Colorsteel or Colorcote for the
environmental conditions at the intended building location, and as specified in
E2/AS1 Table 20.
Installation requirements
Materials in
contact with Multirib® must be
compatible as specified in E2/AS1 Table 21.
Maintenance requirements
Regular maintenance
will extend the life of Multirib® and associated accessories.
Maintenance guides are available from Roofing
Industries or can be downloaded from either NZ Steel or Pacific Coilcoaters
website.
Guide to regular maintenance -
- Inspect the roof,
including fasteners, and repair any damage every 6 months.
- Wash areas not receiving regular rain washing with fresh water
at least every 3 – 6 months.
- Remove debris from gutters every 3 - 6 months.
- Remove any noticeable buildup of salt deposits and/or other
contaminants when identified.
- Please consult with
your local distributor when considering over painting to ensure correct
procedures are undertaken.
Environmental
Colorsteel and Colorcote prepainted steel has been extensively tested and proven in some of New Zealand's most extreme UV, wind, rain, snow and ice environments.
All Colorsteel and Colorcote is factory painted at either NZ Steel, Glenbrook or Pacific Coilcoaters, Penrose. Both plants operate within strict environmental controls.
Environmental category literature available by request or the roof.co.nz website, or by contacting Roofing Industries, technical helpline 0800 844 822
Relationships
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New Zealand Made |
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Date last validated:
13 April 2017 |
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Date last updated:
13 April 2017 |