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Where larger spans or greater robustness is required, the higher ribbed trapezoidals make their mark. ST7 and ST900 have medium height ribs of 38mm, giving a bolder look for residential applications and enhanced strength for commercial and industrial work.

ST900 can be manufactured with a subtle swage that adds stiffness to the pan. minimising and purlin line marking

ST900 in .55mm thickness can be crimp-curved to a minimum radius of 400mm.

All Steel & Tube roofing, cladding and rainwater goods manufactured from COLORSTEEL are accredited with Environmental Choice which contributes to Homestar and Greenstar.

Key Features
  • ST900 is manufactured in Auckland and Christchurch
  • Minimum pitch 3°
  • ST900 has 900mm effective cover
  • ST900 has 7 ribs at 38mm height which allows for a higher fastener density for higher wind zones
  • Offers a bolder line and greater strength than low rib profiles
  • Popular commercial product due to its looks and performance
  • Distinct capillary groove creates positive water tight lap.
  • Easy to attach solar installations for commercial and residential
  • Translucent sheeting available to match
Eco Choice Aotearoa (ECNZ) Licensed
Eco Choice Aotearoa
NZ Made
NZ Made
NZ-Owned Business
NZ-Owned Business
Scope of Use
  • Commercial and Industrial roofing and cladding
  • Residential roofing and cladding
  • Drape and Crimp Curving
  • Steel & Tube ST900 is available in a variety of materials to suit the environment including galvanised, Zincalume and Aluminium.
  • Matching glass reinforced natural lighting sheets are available in trafficable, non-trafficable,thermal and condensation control and fire ratings to suit the project
  • A full range of matching accessories are available including ridging, underlays, safety mesh, fasteners and rainwater systems.
Limitations on Use
  • Minimum pitch 3°
3° Minimum Roof Pitch Required
NZS 3604 Corrosion Zone B suitable
Corrosion Exposure Zone B
NZS 3604 Corrosion Zone C suitable
Corrosion Exposure Zone C
NZS 3604 Corrosion Zone D suitable
Corrosion Exposure Zone D
NZS 3604 Wind Zone Extra High suitable
Extra High Wind Zone
NZS 3604 Wind Zone Specific Design suitable
Specific Design Wind Zone
Statement of Building Code Compliance
  • Clause E2 External Moisture: ST900 will comply with the performance requirements of E2 when installed in accordance with E2/AS1. Alternatively, when designed in compliance with the NZ Metal Roof and Wall Cladding Code of Practice, or Steel & Tube Roofing Solutions Product Guide, ST900 will comply with Clause E2 where SLS wind loads do not exceed 3.0 kPa. 
  • Clause B1 Structure: In .40mm or .55mm steel, G550 grade (high strength) ST900 will meet the requirements of B1 for the following loads and spans. Figures are given for rib fastening with self drilling screws and proprietary load spreading washer to each rib. Pan fixing of wall cladding will also attain the same loads. For other materials or grades of material, or applications outside the attached graph, specific design is required.
  • Clause B2 Durability: With normal maintenance, the requirements of Acceptable Solution B2/AS1 will be met by nominated materials in the following environments as defined in New Zealand Steel Specifiers and Builders Guide June 2010.  
Other Performance Attributes

All Steel & Tube roofing, cladding and rainwater goods manufactured from COLORSTEEL are accredited with Environmental Choice which contributes to Homestar and Greenstar.

B2 Durability compliant
C Protection from Fire compliant
Protection from Fire
E2 External Moisture compliant
External Moisture
BIM Files ST900
CAD/PDF Link ST900
PTS / Data Sheet
Environmental Choice NZ Award — Auckland Branch

2022 March

Environmental Choice NZ Award — Christchurch Branch

2022 March

Test Results: Fire Testing
Colorsteel Material Selection
Maintenance Instructions
Brochure: Product Showcase
Brochure: Roofing Solutions Product Guide
Colour Range
Order Roofing and Wall Cladding Samples
Product Resources and Links

Steel & Tube are a New Zealand supplier of a range of steel products and services.

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