Corrugate Roofing – Traditional Roofing and Wall Cladding Profile

Corrugate roofing is a traditional metal roofing and wall cladding system widely used across New Zealand for residential, rural, and light commercial buildings. Freeman Roofing’s Corrugate profile provides a timeless appearance, practical weather performance, and versatile application suited to both new builds and renovation projects.

The system is manufactured custom cut to length (subject to transport and site limitations), allowing sheet lengths to be tailored to project requirements. Corrugate is part of Freeman Roofing’s broader range of metal roofing profiles designed for architectural, residential, and commercial applications.

Key Features of Corrugate Roofing

Freeman Roofing Corrugate offers several advantages for roofing and wall cladding systems:

• Traditional corrugated profile suited to a wide range of building styles
• Rib depth of approximately 17 mm providing strength and water-shedding performance
• Effective cover width of approximately 762 mm
• Corrugation pitch of approximately 76 mm
• Suitable for both roofing and wall cladding applications

The classic corrugated shape creates a familiar New Zealand roof form, making Corrugate a popular choice for villas, contemporary homes, farm buildings, sheds, and fencing applications.

Minimum Roof Pitch

The minimum roof pitch for Corrugate roofing is 8°, when the system is designed and detailed in accordance with Freeman Roofing design details and recognised New Zealand compliance pathways.

If roof sheets are end lapped, the minimum pitch should be increased to 10°. Low-pitch roof applications and longer roof runs require appropriate detailing and installation to ensure adequate drainage and weather performance.

Typical Applications

Corrugate roofing is commonly used for:

Residential Roofing

Homes where a traditional corrugated roof profile is desired, including both renovation and new build projects.

Wall Cladding Systems

Corrugate can also be used as wall cladding for residential, rural, and light commercial buildings when installed with the appropriate fixing method and support system.

Rural and Utility Buildings

Sheds, farm buildings, garages, and similar structures where a durable and practical cladding profile is required.

For other roofing systems see Freeman Roofing’s full range of roofing styles and profiles.

Important Design Considerations

Correct detailing is essential to ensure the long-term performance of corrugate roofing systems.

Minimum Pitch and End Laps

Corrugate roofing requires a minimum roof pitch of 8°. Where end laps are used, additional pitch and continuous sealing of the lap are required to maintain weather performance.

Thermal Movement

Metal roofing expands and contracts with temperature changes. Detailing must allow for thermal movement across the roof system, particularly on longer sheet lengths and darker colours.

Wind Zones and Substrate

Substrate requirements, span capability, and fixing selection may vary depending on wind zone, exposure conditions, material type, and sheet thickness.

Material selection may include products such as COLORSTEEL® or aluminium depending on project requirements and environmental conditions.

Talk to Your Local Freeman Roofing Branch

For product availability, sheet length constraints, and project-specific detailing support, contact your local Freeman Roofing branch.

Our team can assist architects, designers, and builders with selecting the appropriate Corrugate roofing system for their project.

Compliance

Corrugate must be installed in accordance with:

• Freeman Roofing Corrugate design details
• The NZ Metal Roofing Manufacturers Code of Practice
• Relevant New Zealand Building Code compliance pathways

Buildings outside the scope of standard acceptable solutions may require project-specific design and consenting.