Stramit Longspan® Roof and Wall Cladding

Stramit Longspan® Roof and Wall Cladding


  • 700mm Cover – quick installation and easy handling.
  • Easy Fixing – conventional through fixed screws maximise performance and installation.
  • Hi-Tensile Steel – light weight and high strength with improved damage resistance.
  • Spring Curving – new data for curved roofs.
  • Design Flexibility – long lengths and anti-capillary side laps enable Stramit® Longspan cladding to be used effectively on applications from vertical wall cladding and fascias to roofs with pitch as low as 1.5°.
  • Fully Tested – a full range of load performance tables to suit most applications.
  • Extended Spans – strength and rigidity of the profile allows economical construction.


The striking linearity, strength, wide cover, light weight and weather resistance of Stramit Longspan®  cladding make it perfect for many commercial roofing and walling applications. Its excellent strength and ease of assembly allow for long, economical spans.The good water-carrying capacity and weather-tightness permit very low roof pitches, leading to economies in the building structure.

Stramit Longspan®  cladding is also used for domestic applications, where a strong but uniform appearance is desired.


Stramit Longspan®  cladding is manufactured from hi-tensile G550 colour coated steel or 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)
Zincalume Colorbond Galvanised
0.42mm BMT 4.66 4.74 5.07
0.48mm BMT 5.29 5.37 5.70

Adverse Conditions

Stramit Longspan® 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 the table on page 3 of the Stramit Longspan® Product Technical Manual shows the suitability of coating types for different exposure conditions.

Please refer to the table on page 3 of the Stramit Longspan® Product Technical Manual  for the approximate site exposure conditions.

The suitability and exposure tables are guidelines only; conditions will vary from site to site. If uncertain about the appropriate coating for a particular application, or if the product is to be used in environments affected by industrial emissions, fossil fuel combustion or animal farming.


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 Wagga Roofing World for more detailed information.


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)
  • The University of Sydney
  • Monash University
  • University of Queensland
  • University of Technology, Sydney

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

Architectural Specification

This specification can be found on the Stramit web site and can be easily downloaded onto your documentation.

The roofing/walling shall be 0.42 (or 0.48) mm BMT Stramit Longspan® cladding in continuous lengths with trapezoidal ribs 27mm high, spaced at 100mm centres. Sheeting material shall be protected steel sheet to Australian Standard AS1397, with a minimum yield stress of 550MPa (Grade G550) and an AZ150 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 fixing screws in accordance with Australian Standard AS3566, Class 3, shall be used at every support with side lap fasteners installed at mid span if required. 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. Flashings shall be supplied in compatible materials as specified; minimum cover of flashing shall be 150mm. All sheeting shall be fixed in a workman-like manner, leaving the job clean and weathertight. Repair minor blemishes with touch-up paint supplied by the sheeting manufacturer. All debris (nuts, screws, cuttings, filings etc.) shall be cleaned off daily.

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