You are using an outdated browser version not supported by this website.
Click here to upgrade your browser

T-Rib Roofing and Wall Cladding System

T-Rib is a 5 Rib trapezoidal roofing profile that can be used in commercial and residential applications as a roof or wall cladding solution. T-Rib offers the value of Corrugate whilst being able, by design, to achieve roof pitches down to 3 degrees and is available in Zincalume®, Galvsteel®, Coloursteel® Endura® and Coloursteel® Maxx®.

Key Features
  • Asymmetrical trapezoidal profile
  • Suitable for roofing, and as horizontal or vertical cladding
  • Ideal for low pitch roofs (3° min)
  • Bullnose, Drape and Spring Curving options available
  • T-Rib is available in Zincalume®, Galvsteel®, Coloursteel® Endura® and Coloursteel® Maxx®
  • T-Rib is available in the following sizes:
    • Thicknesses: 0.4mm and 0.55mm
  • Width: Cover = 760mm Sheet = 810mm
Scope of Use

Metalcraft Roofing supply the T-Rib System as a horizontal and vertical wall external cladding and on roofs with a minimum pitch of 3° on commercial and residential buildings within the following scope:


  • In wind zones:
    • Up to and including Extra High as defined by NZS-3604:2011
    • Subject to specific engineering, if the engineer has satisfied themselves that the product, pitch and fixings will meet the conditions
  • In all climate zones as defined by NZS-3604:2011, subject to the limitations set out below 
  • On buildings located within 1m of the relevant boundary, in respect of fire spread only


  • On new buildings that have been designed and constructed to comply with the NZ Building Code (NZBC) using timber or steel framing
  • On existing buildings using timber and steel framing where the designer and installer have satisfied themselves that the building is suitable for the intended building work
  • In conjunction with a vapour permeable building wrap that has a permeability of 36g/m2/day of a vapour resistance of no more than 500MNs/g
  • Can be used in conjunction with a potable water collection system
Limitations on Use


  • T-Rib may be used as a roof cladding system in exposure zones B, C & D. For use in 'Microclimatic considerations,' (as defined in Sec 4.2.4) refer to Metalcraft Roofing
  • T-Rib may be used as a wall cladding system in exposure zones B & C
  • Where T-Rib is to be used as a wall cladding in exposure Zone D, then only Colorsteel® Endura® or Colorsteel® Maxx® may be used


  • Where T-Rib is used in an insulated building in conjunction with steel framing, a thermal break is required
  • Contact with other materials must be in accordance with Table 21 (E2/AS1), or compatible with the The New Zealand Metal Roofing Manufacturers Association Inc (NZMRM) Code Of Practice
  • Building height and design wind speed is limited by the T-Rib design load span tables
  • Where it is used as a roof cladding system, T-Rib sheet lengths of ≤ 40m must be installed on a roof with a minimum pitch of 3°. T-Rib sheet lengths of > 40m but less than ≤ 60m must be installed on a roof with a minimum pitch of 4°
  • T-Rib can be used in conjunction with a potable water collection system
  • When used as a wall cladding, T-Rib must be installed in conjunction with a drained cavity
3° Minimum Roof Pitch Required
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

If designed, installed and maintained in accordance with all Metalcraft Roofing requirements, the T-Rib Roofing and External Cladding system will comply with or contribute to compliance with the following provisions of the New Zealand Building Code:

  • B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, b, c, d, g, i)
  • B2 Durability: B2.3.1 (b)
  • C3 Fire Affecting Areas Beyond the Fire Source: C3.4(a), C3.5, C3.7 (a) 
  • E2 External Moisture: E2.3.1, E2.3.2, E2.3.7 (a-c)
  • F2 Hazardous Building Materials: F2.3.1

See product technical statement for full information.

Other Performance Attributes
  • T-Rib Roofing will not contaminate potable water — AS/NZS 4020:2005
B1 Structure compliant
B2 Durability compliant
C Protection from Fire compliant
Protection from Fire
E2 External Moisture compliant
External Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
Product Technical Statement


Loadspan Graph and Fixing Table
Fire Testing Document
Environmental Category Brochure
T-Rib Product Brochure
Colour Range
CAD/PDF Details
Commercial Horizontal Cladding Details DWG
Commercial Horizontal Cladding Details DXF
Commercial Roof Details DWG
Commercial Roof Details DXF
Commercial Vertical Cladding Details DWG
Commercial Vertical Cladding Details DXF
Residential Horizontal Cladding Details DWG
Residential Horizontal Cladding Details DXF
Residential Roof Details DWG
Residential Roof Details DXF
Residential Vertical Cladding Details DWG
Residential Vertical Cladding Details DXF
Commercial Horizontal Wall Cladding Details


Commercial Roof Details


Commercial Vertical Cladding Details


Residential Horizontal Cladding Details


Residential Roof Details


Residential Vertical Cladding Details


Commercial Horizontal Cladding Details RVT
Commercial Roof Details RVT
Commercial Vertical Cladding Details RVT
Residential Horizontal Cladding Details RVT
Residential Roof Details RVT
Residential Vertical Cladding Details RVT

Metalcraft Roofing are a privately owned building product rollformer and installer with an extensive range of longrun roofing profiles, lightweight metal tiles and rainwater system solutions.

Product Enquiries

News from Metalcraft Roofing

Modern, Innovative Learning at Lemonwood Grove School
Metalcraft Solar: Fully Integrated Solar Systems
Cedar and Deep Trough Combo Provides Eye-Catching Facade
Get a free weekly digest of essential news

New and updated architectural products, design solutions, inspiration, technical advice and more when you sign up for EBOSS.