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Espan 470 Deep Trough Roofing and Cladding System

Espan® 470 is a Roofing and External Wall Cladding system comprised of a 49mm deep trough profiled steel sheet, along with associated design and installation information.

Metalcraft fabricates the Espan 470 sheets from steel manufactured by New Zealand Steel. This steel is supplied with different protective coatings which are designed to withstand conditions in specific New Zealand Corrosion Zones.

Key Features
  • Deep trough profile, with high ribs for strong defined shadow lines 
  • Suitable for roofing and vertical cladding
  • Ideal for low pitch roofs (3° minimum)
  • The sheet profile is available as a flat pan or with one or two swages incorporated into the pan
  • Hidden clips attach directly to purlins
  • Clip-on solar panels may also be installed
  • Espan 470 sheets are available in Colorsteel® Endura® and Colorsteel® Maxx®
  • Espan 470 sheets are available in the following sizes:
    • Thickness: 0.4mm, 0.55mm
    • Width: Cover = 470mm, Sheet = 484mm


Scope of Use

Metalcraft Roofing supply the Espan® 470 as a vertical external wall cladding, and on roofs with a defined minimum pitch of 3 degrees for use 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


  • Espan® 470 may be used as a roof cladding system in exposure zones B, C & D as defined in Sec 4, NZS3604:2011. For use in 'Microclimatic considerations,' (as defined in Sec 4.2.4) refer to Metalcraft Roofing
  • Espan® 470 may be used as a wall cladding system in exposure zones B & C. Where Espan® 470 is to be used in exposure Zone D, then only Colorsteel® Endura® or Colorsteel® Maxx® may be used


  • Where Espan® 470 is used in an insulated building in conjunction with steel framing, a thermal break is required. This will depend on the location of the insulation. Timber thermal breaks are recommended.
  • 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 Espan 470 design load span tables
  • Where it is used as a roof cladding system, Espan® 470 sheet lengths of ≤40m must be installed on a roof with a minimum pitch of 3°. Espan® 470 sheet lengths of >40m but less than <60m must be installed on a roof with a minimum pitch of 4°
  • When used as a wall cladding, Espan® 470 must always 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 Espan® 470 Roofing and External Cladding system will comply with or contribute to compliance with the following provisions of the NZ Building Code:

  • B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a), (b), (c), (d), (g), (h) & (i) — Building element, installation of a building element — B1/VM1, AS/NZS 2728:2013
  • B2 Durability: B2.3.1 (b) — Minimum 15 yrs
  • C3 Fire Affecting Areas Beyond the Fire Source: C3.4 (a), C3.5, C3.6, C3.7 (a), C3.8 & C3.9
  • E2 External Moisture: E2.3.1, E2.3.2, E2.3.7 (a-c)
  • F2 Hazardous Building Materials: F2.3.1
  • G12 Water Supply: G12.3.1

See product technical statement for full information.

Other Performance Attributes
  • Espan® 470 Roofing and External Cladding system 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
Span Tables
Fire Testing Document
Environmental Category Brochure
Product Brochure
Colour Range
Additional Information
PV Solar Laminates
CAD/PDF Details
Commercial Roof Details
Commercial Roof Details DWG


Commercial Roof Details DXF


Commercial Vertical Cladding Details
Commercial Vertical Cladding Details DWG


Commercial Vertical Cladding Details DXF


Residential Roof Details
Residential Roof Details DWG


Residential Roof Details DXF


Residential Vertical Cladding
Residential Vertical Cladding Details DWG


Residential Vertical Cladding Details DXF


Commercial Roof Details RVT
Commercial Vertical 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.

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