Environment
AS/NZS 2728: 1997, (Australia/New Zealand Standard – Prefinished / Prepainted Sheet Metal Products for Interior / Exterior Building Applications - Performance Requirements), classifies the atmospheric environment into 7 categories and provides a guide to the selection of prefinished products in these categories.
For further classification information please refer to AS/NZS 2728:1997 Table 2.1B Atmospheric Classification Definition
Mild | Sheltered areas that are far inland (very few in NZ). |
|---|---|
Moderate | Areas that are protected from marine influence. Are inland areas other than those that are far inland. |
Industrial | Industrial areas that are inland. |
Marine | Large parts of NZ including areas 100m – 400m from the shoreline in sheltered areas (inner harbour and estuaries) and more than 1 km from breaking surf shoreline. Can extend up to 30kms inland depending on topography and prevailing winds. |
Severe Marine | Areas that range from 100m to 1km from a breaking surf shoreline. In high wind areas the distance inland will increase. It also includes areas that are less than 100m (but can extend up to 400m depending on prevailing winds) from the shoreline in sheltered |
Very Severe Marine | In areas up to and including 100m from breaking surf. Will extend inland 400m or more where strong prevailing winds exist. |
Industrial & Geothermal | Areas of high corrosion including chemical plants and geothermal areas. |
Severe Chemical Environments (additional to AS/NZS 2728) | Unusually harsh conditions due to moisture generation and/or chemical usage or storage (e.g. cool stores, animal shelters, fertilizer storage). Will require specific material selection for sheeting, fasteners and netting. Contact Dimond for advice. |
Environment Categories and Suitable Sheeting and Fastener for Mild Moderate Industrial Marine Conditions
| Substrates | Prefinished Paint Coating Types | Branded Sheeting Porducts | Recommended Screw Fastener Material ** | Washer Material |
| Zinc Coated Steel | - | Glavsteel | Class 4, minimum | Galvanised |
| Zinc/Aluminium Coated Steel (150g/m²) Zinc/Aluminium/Magnesium (MagnaFlow & MagnaFlow X) |
- | Zincalume | Class 4, minimum | Zincalume |
| Zinc/Aluminium Coated Steel (150g/m²) Zinc/Aluminium/Magnesium (MagnaFlow & MagnaFlow X) |
Polyester, Acrylic | ColorCote ZinaCore, ColorCote MagnaFlow, Colorsteel Endura | Class 4, minimum | Post Painted Steel |
| Zinc/Aluminium Coated Steel (150g/m²) Zinc/Aluminium/Magnesium (MagnaFlow & MagnaFlow X) |
PVDF | ColorCote ZinaCore X & ColorCote MagnaFlow X | Class 4, minimum | Post Painted Steel |
| Aluminium | - | Plain or embossed finish | 304 Stainless Steel or Alum.** | Aluminium |
| Aluminium | Polyester, Acrylic | ColorCote AlumiGard | 304 Stainless Steel or Alum. ** | Post Painted Aluminium |
| Aluminium | PVDF | ColorCote AlumiGard X | 304 Stainless Steel or Alum. ** | Post Painted Aluminium |
| Stainless Steel | - | - | 304 Stainless Steel | 304 Stainless Steel |
| Copper | - | - | 304 Stainless Steel or Bronze | - |
| Glass Reinforced Polyester (GRP) | Gel Coat | Duraclad, Webglass | 304 Stainless Steel or Alum. | Weatherlok (UV Stabilised PEA) |
*Use of coil on cut edge protection lacquer may be required.
Alum. = Aluminium Alutites for timber only.
**Stainless Steel fasteners must be installed with clearance and separation to avoid contact with Aluminium.
Environment Categories and Suitable Sheeting and Fastener Materials for Severe Marine Conditions
| Substrates | Prefinished Paint Coating Types | Branded Sheeting Products | Recommended Screw Fastener Material ** | Washer Material |
| Zinc/Aluminium coated Steel (200g/m²) | Polyester | Colorsteel Maxx | Class 4, minimum | Post Painted Steel |
| Zinc/Aluminium coated Steel (150g/m²) Zinc/Aluminium Magnesium |
PVDF | ColorCote ZinaCore X & ColorCote MagnaFlow X | Class 4, minimum | Post Painted Steel |
| Aluminium | - | Plain or Embossed | 304 Stainless Steel or Alum. ** | Aluminium |
| Aluminium | Polyester, Acrylic | ColorCote AlumiGard | 304 Stainless Steel or Alum. ** | Post Painted Aluminium |
| Aluminium | PVDF | ColorCote AlumiGard X | 304 Stainless Steel or Alum. ** | Post Painted Aluminium |
| Stainless Steel | - | - | 304 Stainless Steel | 304 Stainless Steel |
| Copper | - | - | 304 Stainless Steel or Bronze | - |
| Glass Reinforced Polyester (GRP) | Gel Coat | Duraclad, Webglass | 304 Stainless Steel or Alum. | Weatherlok (UV Stabilised PEA) |
*Use of coil on cut edge protection lacquer may be required.
Alum. = Aluminium Alutites for timber only.
**Stainless Steel fasteners must be installed with clearance and separation to avoid contact with Aluminium.
Environment Categories and Suitable Sheeting and Fastener Materials for Very Severe Marine Industrial Geothermal Conditions
| Substrates | Prefinished Paint Coating Types | Branded Sheeting Products | Recommended Screw Fastener Material ** | Washer Material |
| Zinc/Aluminium coated Steel (200g/m²) | Polyester | Colorsteel Maxx | Class 5, minimum | Post Painted Steel |
| Zinc/Aluminium/Magnesium | PVDF | ColorCote MagnaFlow X | Class 5, minimum | Post Painted Steel |
| Aluminium | - | Plain or Embossed | 304 Stainless Steel or Alum. ** | Aluminium |
| Aluminium | Polyester, Acrylic | ColorCote AlumiGard | 304 Stainless Steel or Alum. ** | Post Painted Aluminium |
| Aluminium | PVDF | ColorCote AlumiGard X | 304 Stainless Steel or Alum. ** | Post Painted Aluminium |
| Stainless Steel | - | - | 316 Stainless Steel | Stainless Steel |
| Copper | - | - | 316 Stainless Steel or Bronze | - |
| Glass Reinforced Polyester (GRP) | Gel Coat | Duraclad*, Webglass | 316 Stainless Steel or Alum. | Weatherlok (UV Stabilised |
*Use of coil on cut edge protection lacquer may be required.
Alum. = Aluminium Alutites for timber only.
**Stainless Steel fasteners must be installed with clearance and separation to avoid contact with Aluminium.
Environment Categories and Suitable Sheeting And Fastener Materials for Severe Chemical Conditions
| Substrates | Prefinished Paint Coating Types | Branded Sheeting Products | Recommended Screw Fastener Material ** | Washer Material |
| Glass Reinforced Polyester (GRP) | Gel Coat | Duraclad*, Webglass (Consult with Dimond) | Consult with Dimond | Weatherlok (UV Stabilised PEA) |
*Use of coil on cut edge protection lacquer may be required.
Alum. = Aluminium Alutites for timber only.
**Stainless Steel fasteners must be installed with clearance and separation to avoid contact with Aluminium.
