Stramit® Curved Corrugated & Bullnose Roof Cladding

Stramit Sunset® Patio Panel



  • Design flexibility – expands the versatility of traditional corrugated roofing by increasing flexibility of design
  • Variety of shapes – can be formed into a wide variety of curved shapes and radii down to a nominal 500mm minimum
  • Easy fixing – conventional through-fixed screws maximise performance and ease of installation
  • 762mm cover – quick installation and easy handling
  • G300 curving quality base steel – also available as flat sheets to ensure matching profile on end laps
  • Fully tested – full range of load performance tables to suit most applications.


Stramit® Curved Corrugated steel roofing can be pre-curved to produce a variety of interesting effects that enhance both modern and traditional building designs. Straight sheets can be combined with convex and concave curves to create highly original and aesthetically pleasing roof shapes.

The heritage bullnose veranda is the best-known application of curved corrugated sheeting but by no means the only one.  Stramit® Curved Corrugated roofing is also a popular choice on contemporary steel-roofed homes and commercial buildings.

Stramit® Curved Corrugated
 cladding is only intended for use in commercial/industrial/residential roof or wall cladding applications. Do not use for any other purpose.


Stramit® Curved Corrugated cladding is manufactured from G300 colour coated steel or zinc-aluminium alloy coated steel. In some locations galvanised and severe environment colour coated steel may be available by arrangement. Colour coated steels are in accordance with AS2728 – Category 3 and, for the substrate, with AS1397. Zinc-aluminium alloy coated AZ150 and galvanised Z450 conform to AS1397.

Stramit has a comprehensive range of colours as standard. Refer to the Colorbond® colour chart.

SHEETING MASS (kg/m2 of roof area)
thickness bmt grade Zincalume® Colorbond® Galvanised
0.60mm 300MPa 6.02 6.09 6.39


Stramit has in-house, purpose built, testing equipment used to design, develop and improve products for the Australian market. In addition many Stramit® products are tested or witnessed by independent organisations. These include:

  • Cyclone Structural Testing Station
    (James Cook University)
  • University of Queensland

This ongoing research and development activity ensures that Stramit remains at the forefront of innovation, design and consumer information

Adverse Conditions

Stramit® Curved Corrugated
 cladding will give excellent durability in almost all locations. It is however important to choose the correct coating for each application environment.

Please refer to page 3 of the Stramit® Curved Corrugated & Bullnose Roof Cladding Product Technical Manual for the two tables on exposure conditions.


All building products need to be checked for compatibility with adjacent materials. These checks need to be for both direct contact between materials, and where water runs from one material to another. The following guidelines generally avoid material incompatibility:

  • For  zinc-aluminium alloy coated steel, colour coated steel and galvanised steel roofs avoid copper, lead, green or treated timber, stainless steel and mortar or concrete.
  • In addition galvanised steel roofs should not receive drainage from aluminium or any inert materials, such as plastics, glass, glazed tiles, colour coated and zinc-aluminium alloy.  Contact Stramit for more detailed information.

Architectural Specification

The roofing/walling shall be 0.60mm BMT Stramit® Corrugated in continuous lengths with sinusoidal curved ribs 16mm high spaced at 76.2mm centres in accordance with AS1445, curved to a radius of __ mm. Sheeting material shall be protected steel sheet to Australian Standard AS1397 with a minimum yield stress of 300MPa (Grade 300) and an AZ 150 zinc-aluminium coating with or without an oven-baked paint film of selected colour. The sheeting shall be fixed to the purlins/girts in accordance with the manufacturer’s recommendations. Suitable fixed screws in accordance with Australian Standard AS3566, Class 3, shall be used at every support with side lap fasteners installed at mid span. Sheets shall be laid in such a manner that the approved side lap faces away from the prevailing weather.

A minimum of 50mm shall be provided for projection into gutters. Flashing shall be supplied in compatible materials as specified; minimum cover of flashing shall be 150mm. AII sheeting shall be fixed in a workman-like manner, leaving the job clean and weather tight. All debris (nuts, screws, cuttings, filling, etc.) shall be cleared off daily.

Typical Curved Profiles

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