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Material Selection

Note: this is the minimal requirement to achieve compliance with NZBC Clause B2-Durability.  Meeting the minimum requirements of NZBC clause B2 Durability does not necessarily represent optimal product selection. In a transition zone, it may be more cost-effective over the life cycle of the building and for meeting customer expectations to choose a more durable option.

Material Selection : Exposed Roofs and flashing

Durability Required : 15 years

Marine ZoneExposed Fastener
Class (minimum)		Acceptable Materials
***As defined by AS/NZS 2728.
B:
Moderate Inland		C4†
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
  • Pre-painted steel Type 4***
  • AZ 150 coated steel
  • Galvanised steel Z 450
C:
Moderate Marine		C4
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
  • Pre-painted steel Type 4***
  • AZ 150 coated steel
  • Galvanised steel Z 450
D:
Severe Marine		C4
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
  • Pre-painted steel Type 4***
E:
Very Severe Marine		C5
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
F:
Extreme Marine		C6†
  • Aluminium
  • Pre-painted aluminium
 
Materials accepted by NZMRM as complying with coating types include:
  • Painted steel Type 4:
    Colorsteel®, Colorcote® ZinaCore™
  • Painted steel Type 6:
    Colorsteel® Maxam®, Colorcote® MagnaFlow™, Colorcote® MagnaFlow X™

† C4 and C6 fasteners in accordance with AS/NZS 3566.

 

Material Selection : Walls*, fascias and sheltered roofs and flashings

Durability Required : 15 years

Marine ZoneExposed Fastener
Class (minimum)		Acceptable Materials
*The practicality of carrying out regular maintenance, and difficulty of replacement, should also be considered when considering wall cladding material options.
***As defined by AS/NZS 2728.
B:
Moderate Inland		C4
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
  • Pre-painted steel Type 4***
  • AZ 150 coated steel
  • Galvanised steel Z 450
C:
Moderate Marine		C4
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
  • Pre-painted steel Type 4***
  • AZ 150 coated steel
D:
Severe Marine		C4
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
E:
Very Severe Marine		C5
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
F:
Extreme Marine		C6
  • Aluminium
  • Pre-painted aluminium
 
Materials accepted by NZMRM as complying with coating types include:
  • Painted steel Type 4:
    Colorsteel®, Colorcote® ZinaCore™
  • Painted steel Type 6:
    Colorsteel® Maxam®, Colorcote® MagnaFlow™, Colorcote® MagnaFlow X™

 

Material Selection : Flashings Behind Cladding

Durability Required : 50 years

Marine ZoneAcceptable Materials
**Stainless steel must not be in wet contact with metallic coated steel, plain or painted.
***As defined by AS/NZS 2728.
B:
Moderate Inland
  • Stainless Steel**
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
  • Pre-painted steel Type 4***
  • AZ 150 coated steel
  • Galvanised steel Z 450
C:
Moderate Marine
  • Stainless steel**
  • Aluminium
  • Pre-painted aluminium
  • Pre-painted steel Type 6***
D:
Severe Marine
  • Stainless steel**
  • Aluminium
  • Pre-painted aluminium
E:
Very Severe Marine
  • Stainless steel**
  • Aluminium
  • Pre-painted aluminium
F:
Extreme Marine
  • Stainless steel**
  • Aluminium
  • Pre-painted aluminium
 
Materials accepted by NZMRM as complying with coating types include:
  • Painted steel Type 4:
    Colorsteel®, Colorcote® ZinaCore™
  • Painted steel Type 6:
    Colorsteel® Maxam®, Colorcote® MagnaFlow™, Colorcote® MagnaFlow X™
Clause: 
004_006_003_000_000_000_000_000_000
Clause Number: 
4.6.3
4.6.3
/cop/durability/environmental-categories#material-selection
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

Materials endorsed as complying with AS/NZS 2728 coating types have been changed to align with the current ColorsteelⓇ product range.

Draft Clause: 
004_006_003_000_000_000_000_000_000