The roofing/walling shall be 0.42 (0.48 or 0.60) mm BMT Stramit Speed Deck^® 500 Concealed Fixed Decking, in continuous lengths with trapezoidal ribs 41mm high, spaced at 250mm centres. Sheeting material shall be protected steel sheet to 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. Suitable fixing screws in accordance with Australian Standard AS3566, Class 3, shall be used at every rib at every support. 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.

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

A NATSPEC work section is available for this product. Download

Concealed fixed decking such as Stramit Speed Deck^® 500 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^® 500 Concealed Fixed Decking have not been tabulated, but can be assumed to equal the outward capacities shown.

Stramit^® Speed Deck 500 Concealed Fixed Decking has purpose made fixing clips to attach the decking to the purlins. These clips require 2 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^® 500 Concealed Fixed Decking are shown for 3 alternative foot traffic categories:

• 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 footpaths
• Controlled – spans that confirm to AS1562.1 with 1.1 kN load specified in AS/NZA1170.1 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.

Stramit Speed Deck^® 500 Concealed Fixed Decking is manufactured from hi-tensile G550 colour coated steel, aluminium-zinc-magnesium alloy coated, 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. 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^® 500 Concealed Fixed Decking is 1 degree for most 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, 1000m² or less in area, where both length and width exceed the building height and site is unaffected by land topography.

Internal spans must have both end spans 20% shorter. TC - Terrain Category. FP, PS, NS - Full, partial and no shielding. Internal pressure coefficient +0.2/-0.3. 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 Stramit Speed Deck® 500 decking must be designed to the pressure and foot traffic limitations shown below. 

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

Stramit Speed Deck^® 500 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 1200, 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. 

The Stramit Spring Curving Guide has more detailed information.

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.

Stramit Speed Deck^® 500 Concealed Fixed Decking has excellent resistance to the problems associated with thermal expansion. Nevertheless sheet lengths should be limited as follows.

Stramit Speed Deck® 500 Concealed Fixed Decking has excellent water carrying capacity. This and the decking stiffness enable roof slopes to be as low as one degree 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 500 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 500 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 spans 20% shorter. 
Values are only valid for use with steel support members of 1.5mm or thicker. Where thinner supports are used, fastener capacity must be checked.

Stramit Speed Deck® 500 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® 500 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 taking care that the clips are aligned with the arrows in the direction  of laying. Screw the clips to the purlins.
• 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.
• Place next clip over trailing edge of the first sheet, allowing it to fall to the purlin. 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® 500 decking turn up/down tool.
• Secure the leading edge of the roof with full or cut­ back clips and the trailing edge with finishing clips, 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. Fix flashing according to AS1562.1.
• 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 finish with Stramit supplied touch-up paint.