New Zealand Steel manufactures a range of factory coated Colorsteel prepainted steel products to suit defined environmental conditions. The Colorsteel MAXX paint system consists of an AZ200 (200g/m2 ) Zincalume steel substrate to which a super polyester prepainted finish system is applied. The system is designed to provide protection against corrosion in areas where moderate to severe environmental conditions are experienced. The steel substrate grade is either G550 or G300.
Colorsteel MAXX product is suitable for a wide range of rollformed roof and wall claddings, rainwater accessories and general building products. The Colorsteel MAXX paint system will exceed the service life of most traditional post-painted systems.
When rollformed, installed and maintained in accordance with New Zealand Steel’s recommendations, Colorsteel MAXX prepainted steel is warranted by New Zealand Steel to meet the performance requirements of NZBC B2.3(c) for a 15-year durability when used for the manufacture of roof and wall claddings. Colorsteel MAXX products are expected to fade uniformly over the surface, the extent being no more than 8 Hunterlab units on the Delta E scale, and have a chalk rating of =4 (AS 1580 481.1.11, 1998) after 10 years exposure.
Limitations of Use
Colorsteel MAXX products are designed for use in very severe environments, greater than 50m on the East Coast or greater than 100m on the West Coast. Before using Colorsteel MAXX products near sources of industrial pollution or in geothermal areas, consult the Technical Market Manager, New Zealand Steel.
Colorsteel MAXX products should not be used in the following applications:
- embedded in concrete
- in contact with permanently wet materials
- water tanks
- in contact with soil, bark or similar
- as concrete formwork
- in intensive animal shelters
Copper or brass pipes must not be allowed to discharge onto Colorsteel prepainted steel products or be allowed to come into contact with them. The use of other materials in proximity to Colorsteel prepainted steel products must be in accordance with New Zealand Steel Specifiers’ and Builders Guide. Mixing of brands of pre-painted material on the same building is not recommended by New Zealand Steel Limited.
The reaction between Zincalume steel and lead flashings will degrade the Zincalume® steel material. Soft zinc or aluminium flashings should be used. Marking with lead pencils is not advised, and sealing washers should be low carbon - nonconducting. Refer to New Zealand Steel’s Installers’ Information booklet, “Marking Cutting and Drilling” section.
The Colorsteel MAXX substrate is steel strip, commonly 0.40mm or 0.55mm thick and coated with a 45% zinc, 55% aluminium alloy to a nominal coating mass of 200g/m2 manufactured in accordance to AS1397 : 2001. A range of thicknesses, widths and strengths are available.
Following pre-treatment, a corrosion inhibitive primer, and topcoat is applied to the outer surface and a backer to the reverse side. These coatings are oven cured to provide colour and corrosion performance.
Colorsteel MAXX products are available in a range of colours. The backer coat is a Bass Grey.
Colorsteel MAXX product is identified by a brand applied to the reverse surface, indicating product type and date of manufacture.
Full installation details for Colorsteel MAXX product is contained in the New Zealand Steel Installers’ Guide.
- Aluminium and factory painted fixings are acceptable.
- Stainless steel, monel or other copper alloy fixings must not be used.
- Lead-head nails must not be used.
- Fixings that comply with AS3556 class 3 or 4 are acceptable.
Sealing and Joining
- Use only neutral-cure silicone rubber sealants.
- Do not use abrasive cutting wheels.
- Do not weld, braze or solder Colorsteel® prepainted steel products.
Touch-up paints should not be used, as air-drying paints have different weathering characteristics to the Colorsteel prepainted steel coating.
Clean up – all debris (particularly from roofing installation) must be removed from Colorsteel MAXX product surfaces at the end of each day’s work. Take care not to damage the coating when removing sharp fixing debris.
Colorsteel MAXX roof cladding must be installed at a minimum of 3° or over the minimum pitch given for the profile by the manufacturer, whichever is greater. Factors likely to affect the resistance of Colorsteel MAXX prepainted steel to external moisture include the quality of the installation, the severity of the climate, roof configuration, material profile and the design and execution of junctions between similar materials and other elements.
Rainwater collected from roofs clad with products made from Galvsteel, Zincalume steel and Colorsteel prepainted steel, will comply with the provisions of NZBC G12.3.1, provided the water is not contaminated from other sources. The first 25mm of rainfall from a newly installed roof must be discarded before drinking water collection starts. Where a paint or paint system is applied to the roof, its suitability for the collection of drinking water must be established.
Spread of Fire
Colorsteel MAXX prepainted steel comprises a combustible surface adhered to a non-combustible substrate. Used on roofs, it meets the requirements of NZBC C3/AS1 in all-purpose groups. Refer to C3/AS1 Section 4.0 External Walls and Roofs which covers vertical and horizontal spread of fire.
Hazardous Building Materials
The use of roofing and wall claddings manufactured from Colorsteel MAXX prepainted steel in accordance with New Zealand Steel’s instructions will meet the non-hazardous performance requirements of NZBC F2.3.1.
Handling and Storage
If Colorsteel prepainted steel products are to be stored for any time prior to forming or installation, they must be stored in dry, well-ventilated conditions. Storage which allows water, (including condensation) to be trapped between the sheets may damage the coating beyond repair. Colorsteel MAXX products must be handled carefully during transport, fabrication and fixing to avoid damaging the surface.
Colorsteel MAXX prepainted steel is available ex stock from most roofing distributors in a range of colours. Where a colour is not available, delivery is normally within 1-4 weeks, depending on the location of the distributor.
The Colorsteel MAXX coating can be repainted to extend its serviceable life. Contact New Zealand Steel for recommendations on overpainting weathered Colorsteel products.
The New Zealand Steel paintline is accredited to ISO9001.