Corruagated profile is suitable for many applications and can compliment traditional or modern building desgin. It is a simple profile to install and maintain and is available in a range of materials including Zinc, Copper, Stainless Steel, Aluminium and Colorbond Steel.

 

Features  

  • Economical - low cost roof and wall cladding available in long lengths.
  • Easy Fixing - conventional through fixed screws maximise performance and installation.
  • 762mm Cover - quick installation and easy handling.
  • Hi-tensile Steel - light weight and high strength.
  • 5° Minimum Pitch - to suit most traditional applications.
  • Anti-capillary Side Laps - 11/2  rib overlaps for weather protection.
  • Spring Curving - ideal for curved roofs.
  • Curving Quality - available in G300 steel for architectural roofs or bullnosing.
  • Fully Tested - a full range of load performance tables to suit most applications.

Applications 

The soft uniformity of Stramit® Corrugated cladding gives it a unique versatility for architectural applications.  Still favoured for traditional styled housing, it is also the first choice for contemporary steel-roofed homes. 

Stramit® Corrugated cladding is the most readily curved roofing profile either spring-curved or bullnosed. This has helped to make it popular for smaller commercial applications in both roofing and walling. 

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

Materials

Stramit® Corrugated decking is manufactured from G550 or 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. Ask your nearest Stramit location for colour availability. 

STRAMIT® CORRUGATED CLADDING -
SHEETING MASS (kg/m2 of roof area)

thickness bmtgradeZincalume®Colorbond®Galvanised

0.42mm550MPa4.284.354.65

0.48mm550MPa4.864.935.23

0.60mm300MPa6.026.096.39

Adverse Conditions 

Stramit® Corrugated roof and wall cladding will give excellent durability in almost all locations. It is however important to choose the correct coating for each application environment as shown in the table on page 2 of the Stramit Corrugated Roof and Wall Cladding Product Technical Manual. Durability recommendations do vary based on the application of the product, in roofing or walling installations, shown in the tables on page 2 of the Stramit Corrugated Roof and Wall Cladding Product Technical Manual.

Compatibility

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.
  • The profiles of G300 and G550 Corrugated cladding may vary and should not be used in overlapping configurations. 

Testing 

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.

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® Corrugated cladding in continuous lengths with sinusoidal ribs 16mm high, spaced at 76.2mm centres in accordance with AS1445. 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 roof manufacturer. All debris (nuts, screws, cuttings, filings etc.) shall be cleaned off daily. 

NOTE: 0.60mm G300 Corrugated has a 300MPa steel grade.

Design

Spans

The spans shown below take account of ‘normal’ foot traffic and wind resistance including local pressure zone effects. Pressures are based on AS4055 or AS1170.2 .  Where the two standards differ, the worst case has been taken for each classification. Data should only be used for buildings 7m or less in height, 1000m2 or less in area and unaffected by land topography




Please refer to page 4 of the Stramit Corrugated Roof and Wall Cladding Product Technical Manual  which shows a Table on the Maximum Span Chart (mm) .

Pressures

Please refer to pages 3 and 4 of the Stramit Corrugated Roof and Wall Cladding Product Technical Manual  which shows

  • Serviceability Limit State Capacity
  • Strenghth Limit State Capacity (Non-cyclonic)

Foot Traffic

Foot traffic limits for Stramit® Corrugatedcladding are shown for three alternate foot traffic categories. These are:

  • High Maintenance - for applications with repeated maintenance, particularly where personnel may be unfamiliar with correct procedures for walking on metal roofs.
  • Normal - based on traditional expectations, with moderate maintenance foot traffic using designated foot paths.
  • Controlled - spans that conform to AS1562 but require minimal careful foot traffic only on the designated foot path. Suggested for use only where occasional aesthetic imperfections from foot traffic are acceptable.

STRAMIT® CORRUGATED CLADDING –
FOOT TRAFFIC LIMITED SPANS (mm)

thickness
bmtspan
typefoot traffic limits

heavynormalcontrolled

0.42internal-12001500

equal-900900

double-900900

0.48internal75016001800

equal50012001500

double50012001500

0.60internal-12001900

equal-9001600

double-9001600

Tables are based on tests to AS1562 and AS4040 parts 0 and 1

For more information on foot traffic performance of Stramit® Corrugated cladding and other Stramit® roofing profiles refer to Stramit's Foot Traffic Guide.

Spring Curving

Stramit® Corrugated cladding can be spring-curved, concave and convex, including curved ridges, provided it is sealed at the apex, and within the recommended limits below:

STRAMIT® CORRUGATED CLADDING –
SPRING-CURVED RADII LIMITS (m)

 performance restrictedrestricted by drainage at the
rainfall intensities shown

bmt
(mm)minimum*
radiuslowest
neutral radius370
mm/hr220
mm/hr150
mm/hr

0.4212*25376392

0.4810*25376392

0.608*26376392

*At these radii a maximum support spacing of 900mm applies, and limit state pressure capacities are reduced by 14% for serviceability and 7% for strength. These reductions apply proportionately up to the lowest neutral radius.  Minimum 5 fasteners required per sheed at ends.

For more comprehensive information on spring curving Stramit® Corrugated cladding and other Stramit roofing profiles refer to the Stramit Spring Curving Guide.

Thermal Expansion

All metal roof sheeting is subject to thermal expansion and, where there is a temperature difference between the sheeting and the structure, this needs to be accommodated. The colour of the sheeting will affect the amount of thermal expansion, and whether the sheet is flat or curved will affect its ability to resist without problems. 

Sheet lengths should be limited to those shown below.

STRAMIT® CORRUGATED CLADDING -
MAXIMUM SHEET LENGTH (m)

roof colourlightdark

Flat2517

Spring-curved2017

Due care must be taken to allow for the movement when rigid supports such as prefabricated beams are used.

Water Carrying 

Stramit® Corrugated cladding has limited water-carrying capacity. Roof slopes can be as low as 5° for many applications. Roof run lengths are the combined lengths of all roof elements contributing to a single pan drainage path. This can include the roof length upstream of a roof penetration that concentrates flow into other pans. 

Please refer to page 6 of the Stramit® Corrugated Roof and Wall Cladding Product Technical Manualfor the Table which shows slopes for 100 year return period rainfall intensity.

For more information on water carrying performance of Stramit® Corrugated cladding and other Stramit roofing profiles refer to Stramit’s Roof Slope Guide.