Stramit Speed Deck Ultra® Concealed Fixed Decking

Stramit Speed Deck Ultra® Concealed Fixed Decking



  • Wide Cover – fewer sheets and quicker installation.
  • Deep Ribs – stronger and stiffer with better water carrying capacity; roof slopes as low as 1°.
  • Full Length Clips – to locate ribs and compress insulation.
  • Four Fixing Points Per Clip – with centralised fastening for unsurpassed strength.
  • Hexagon Head Screws – bigger, stronger and easier to install, with less wastage.
  • Outstanding Wind Load Resistance – improved security with lower purlin costs.
  • Spring Curving – data for arched and curved roofs.
  • Automatic Bird Proofing – built in accessory with no need for extra components.
  • Compatible lap joint system
    • allows in-plane long run roofs
    • provides solution for limited access sites.

Australian Design Award

Stramit Speed Deck Ultra® decking, winner of a 1995 Australian Design Award for “using the properties of high tensile steel to their best advantage through good design practices”.


The visual appeal, strength, wide cover, light weight and weather resistance of Stramit Speed Deck Ultra® decking make it perfect for all commercial roofing applications. Its excellent strength and ease of assembly allow for long, economical spans.The large water-carrying capacity and weather-tightness permit very low roof pitches, leading to economies in the building structure.

Stramit Speed Deck Ultra® decking may also be used for domestic applications.


Stramit Speed Deck Ultra® decking is manufactured from hi-tensile G550 colour coated steel or zinc-aluminium alloy coated steel. In some locations galvanised and severe environmental 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.

Overlapping Roof Sheets
For long run roofs that exceed the maximum recommended sheet lengths, and for awkward sites where truck or crane access is limited, the Stramit Farlap® roof lap joint system is available. This enables overlapping sheets to be simply and reliably attached without the need for a traditional step joint. The roof support structure can be designed and fixed in a single plane. Refer to Stramit Farlap® roof lap joint system product technical supplement for full details of the product.

Adverse Conditions

Stramit Speed Deck Ultra® decking will give excellent durability in almost all locations. With all of its fastenings protected beneath the decking, Stramit Speed Deck Ultra®  decking can be expected to outlast through-fixed roofing. It is however important to choose the correct coating for each application environment. Please refer to the table on page 3 of the Stramit Speed Deck Ultra® Product Technical Manual, shows the suitability of coating types for different 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.


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. 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 website and can be easily downloaded onto your documentation.

The roofing/walling shall be 0.42 (or 0.48) mm BMT Stramit Speed Deck Ultra® decking in continuous lengths with trapezoidal ribs 43mm high, spaced at 233mm 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 using patented full length fixing clips supplied. Clips shall be fastened to purlins/girts with screws supplied in accordance with Australian Standard AS3566, Class 3, and attached at every rib. 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 provided 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.

Where the Stramit Farlap® roof lap joint system is to be incorporated add the following to the specification above:

All roof lap joints shall be constructed using the Stramit Farlap® roof lap joint system detailed and fixed strictly in accordance with the manufacturers written installation instructions.

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