The roofing/walling shall be 0.42 (or 0.48) mm BMT Stramit Speed Deck Ultra^® Concealed Fixed 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 AM100/AZ150 coating with an oven-baked paint film of selected colour, or a plain AM125/AZ150 coating.

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 eave 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.

Class 4 fasteners should be used <1km from the coast.

A NATSPEC work section is available for this product. Download

Refer to Stramit^® Cyclonic Areas Roof and Wall Cladding brochure for information on use in cyclonic regions.

Concealed fixed decking such as Stramit Speed Deck Ultra^® Concealed Fixed Decking is the preferred roofing material in alpine areas. This, and many other design suggestions, can be found in Australian Standards HB 106 – ‘Guidelines for Design of Structures in Snow Areas’.

Particular attention is drawn to maintaining an adequate roof slope for snow shedding, and screw fixing of deck pans beneath the ridge capping. Downward load capacities for Stramit Speed Deck Ultra^® Concealed Fixed Decking have not been tabulated, but can be assumed to equal the outward capacities shown.

Stramit Speed Deck Ultra^® Concealed Fixed Decking has purpose made fixing clips to attach the decking to the purlins. These clips require 3 fasteners positioned between the clip upstands. Please refer to the instruction details to ensure correct operation.

All fastening screws must conform to AS3566 – Class 3.

For connecting clips to purlins use:

Foot traffic limits for Stramit Speed Deck Ultra^® Concealed Fixed Decking are shown for 3 alternative foot traffic categories:

Heavy – 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 footpaths.

Controlled – spans that confirm to AS1562.1 with 1.1kN load specified in AS/NZS1170.1 for R2 - Other Roofs. These require minimal careful foot traffic only on the designated footpath. Suggested for use only where occasional aesthetic imperfections from foot traffic are acceptable.

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

For more information on foot traffic performance of Stramit's roofing profiles refer to Stramit's Foot Traffic Guide.

Speed Deck Ultra^® Concealed Fixed Decking is manufactured from hi-tensile G550 colour coated steel, aluminium-zinc-magnesium alloy 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 AS/NZS2728 – Category 4 and, for the substrate, with AS1397. Aluminium-zinc-magnesium alloy coated AM100/AM125, 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. 

The minimum roof slope for Stramit Speed Deck Ultra^® Concealed Fixed Decking is 1 degree for many applications.

The spans shown below take account of 'normal' foot traffic and wind resistance including local pressure zone effects. Pressures are based on AS4055 or AS/NZS1170.2.

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, 16m max width and length less than 5 times the width and unaffected by land topography with max slope of 35°.

* Where roof pitch < 10 degrees, use spans given in red italics for roof corners. Where roof pitch ≥10 degrees, use spans in red italics for ridge/edge corners. Internal spans must have both end spans 20% shorter. TC - Terrain category. FS, PS, NS - Full, partial and no shielding. Internal pressure coefficient +0.2/-0.3, external pressure coefficient -0.9. Values are only valid for use with steel members of 1.5mm or thicker. Where thinner supports are used, fastener capacity must be checked. Refer to Stramit® Top Hat & Battens Product Technical Manual for more information. 

For more specific applications Speed Deck Ultra® decking must be designed to the pressure and foot traffic limitations indicated. 

Spans may exceed those shown in this table, provided the wind pressure and foot traffic limits are not exceeded. 

Stramit Speed Deck Ultra^® Concealed Fixed Decking can be spring curved, concave and convex, including curved ridges, provided it is within the recommended limits below.

*At these radii a maximum support spacing of 1200mm applies, and limit state pressure capacities are reduced by 14% for serviceability and 7% for strength. 

All metal roof sheeting is subject to thermal expansion and this needs to be accommodated where there is a temperature difference between the sheeting and the structure.

The colour of the sheeting will affect the amount of thermal expansion, and whether the sheet is flat or cured will affect its ability to resist without problems. Speed Deck Ultra^® Concealed Fixed Decking has excellent resistance to the problems associated with thermal expansion, however sheet lengths should be limited as follows.

*Transport restrictions can apply – check with your local Stramit office.

Longer roof run lengths on a single plane support structure can be readily constructed using the Stramit FarLap® roof lap joint system.

Stramit Speed Deck Ultra^® Concealed Fixed Decking has excellent water-carrying capacity. This and the decking stiffness enable roof slopes to be as low as 1° 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.

The table below gives slopes for 100 year return period rainfall intensity.

Based on AS1562.1

For more information on water carrying performance of Stramit Speed Deck Ultra^® Concealed Fixed Decking and other Stramit roofing profiles refer to Stramit's Roof Slope Guide. Maximum water protection is also ensured by the absence of fastener penetrations when using Stramit Speed Deck Ultra^® Concealed Fixed Decking.

Derived from testing, the following tables give the wind load resistance for both serviceability and strength limit states.

Tables are based on testing to AS1562.1 and AS4040 parts 0 and 2. Internal spans must have both end pans 20% shorter.

Values only valid for use with steel support members 1.5mm or thicker. Where thinner supports are used, fastener capacity must be checked. 

Refer to Stramit® Cyclonic Areas Roof and Wall Cladding Brochure for information on use in Cyclonic Regions. 

The Stramit FarLap^® roof lap joint is a patented revolutionary system that changes the way long run roof decking is designed and installed. It provides a multiple sheet option for long length concealed fixed roofing projects that eliminates traditional step joints or the need for long on-site rolled sheets, without compromising the integrity of the roofing structure.

Designed specifically for Stramit Speed Deck Ultra^® Concealed Fixed Decking, the Stramit FarLap^® roof lap joint system allows the installation of lapped sheets on standard purlin framing, without the need for conventional stepped jointing. The system provides a combination of a strong joint and a weather-resisting seal between lapped sheets.

The system is simply installed by clipping onto the ribs of the bottom sheet. The top, overlapping sheet is then pushed on to the Stramit FarLap^® units, providing a structural connection. The joint connectors and sealing foam are manufactured from high technology materials that provide strength and weather-resistance and preserve the existing roofing warranty.

Stramit FarLap^® roof lap joints can only be used with Stramit Speed Deck Ultra^® Concealed Fixed Decking and with the following provisions:

• installed on roofs specifically designed for its use
• all purlins must be in a single plane, ie no step down
• purlins must be spaced to allow for sheeting end spans on either side of the joint, and
• translucent sheeting joints must coincide with the decking joint.

Stramit FarLap^® lap joints are readily installed on Stramit Speed Deck Ultra^® decking. No additional fasteners are required. Stramit Speed Deck Ultra^® Concealed Fixed Decking sheets are installed in the normal manner, except that:

• Alignment of the first row of clips for both the lower and all upper runs should be determined before commencing deck laying on the lower run. This ensures that decking in upper runs is accurately aligned with the lower run.
• Sheet ends at the lap joints must be turned up and down using the FarLap^® turn-up/down tool. Install the lower run and turn up the sheet ends, then install the upper run before turning down the lower ends of the upper sheets.
• The sheet overlap must be at least 350mm.
• Translucent sheeting for a lower run should be fixed before laying decking on an upper run.

When installing the Stramit FarLap^® units:

• Install on the deck above the metal Speed Deck Ultra^® clips (within 50mm).
• Connect each unit to the next by removing and then joining with the link piece.
• Ensure that every decking rib has an independent plastic connector fitted (cut the foam to obtain a start, or final portion from a full unit if needed, ensuring the foam slot coincides with the upper sheet underlap).

Stramit Speed Deck Ultra^® Concealed Fixed Decking is readily installed with or without fibreglass insulation blanket. If practical lay sheets in the opposite direction to prevailing weather.

Installation of Stramit Speed Deck Ultra^® Concealed Fixed Decking is a straightforward procedure using the following fixing sequence.

• Ensure all purlins are in line and correctly installed. Using a string line or the edge of the first sheet, align the first row of fixing clips. Screw the clips to the purlins in the same order as the direction of laying.
• Locate the first sheet over the clips with the correct projection at each end of the sheet. Snap each rib on to the clip at every purlin, always in the order of the direction of laying. Note – Do not use undue force; the deck will easily accommodate clip entry.
• Snap ribs on to clip in order – 1-2-3.
• Hinge next clip about trailing edge of the first sheet, allowing it to fall to the purlin. Ensure correct fitting to the deck edge and that it is sitting on the extended tail of the preceding clip. Align fixing holes together then fasten clip to purlin as before.
• Continue to lay sheets as before. From time to time measure coverage of sheets at ridge and eaves to maintain squareness.
• At end of purlin cut fixing clip (and, if necessary, the roof sheet) to suit.
• Turn up ends of sheet at ridge and turn down eaves ends into gutters using the Stramit Speed Deck Ultra^® Concealed Fixed Decking turn up/down tool.
• Secure leading and trailing edge of the roof with a full or cut-back clip, or sealed fasteners through the roof tray, at every purlin. Cover these with side flashings. Install all flashings as required to weatherproof and complete the roof.
• Clean the roof after each day’s work, removing all screws, cuttings, swarf etc, and leave roof clean and watertight. Repair any minor blemishes in colour coated finishes with Stramit supplied touch-up paint.
• Each clip box has an illustration of the basic clip fixing technique. A more detailed Installation Procedure leaflet (with clear illustrations) is available to assist fixers on site. Ask for a copy to be sent with your order.

Installation details for the FarLap® roof lap joint system and SkyLap® joint system for translucent sheeting are provided in separate supplements included in each box of units. 

For use in conjunction with Stramit FarLap^® joint system, Stramit Skylap^® joint is only suitable for the fibreglass over fibreglass joint and the edge joint of the fibreglass over Stramit Speed Deck Ultra^® decking joint.

Fibreglass sheet overlaps should be a minimum of 350mm as per the normal Stramit FarLap^® recommendations. Stramit's Skylap^® documentation outlines installation instructions.

Free underlap sheet edges may be encountered when using translucent sheeting, may need additional support. Use a 40mm x 40mm x 1.0mm trim angle beneath the underlap and screwed to the purlins if spans exceed 1500mm for 0.42BMT, and 2000 for 0.48BMT.