Stramit Speed Deck® 500 Concealed Fixed Decking

Specifications

Features

  • 500mm Cover – easy sheet coverage calculations.
  • Hi-tensile Steel – lightweight and high strength with improved damage resistance.
  • Bold Ribs – provide better performance with an architecturally pleasing profile.
  • Quick Installation – wide design provides fewer clips (preloaded if desired) ensuring effective cost saving.
  • Secret Fixing – concealed clips for enhanced security and appearance.
  • 1° Minimum Pitch – in long lengths to save support structure.
  • Fully Tested – a full range of load performance tables to suit almost any application.

Applications

The visual appeal, light weight and weather resistance of Stramit Speed Deck® 500decking make it ideal for many commercial roofing applications. The large water-carrying capacity and weather-tightness permit very low roof pitches, leading to economies in the building structure.

Materials

Stramit Speed Deck® 500 decking is manufactured from hi-tensile G550 BlueScope Steel COLORBOND® XRW steel or BlueScope Steel ZINCALUME® steel. In some locations galvanised and Colorbond® Ultra steel may be available by arrangement. Colorbond® XRW (and Ultra) is in accordance with AS2728 – Category 3 and, for the substrate, with AS1397. Zincalume® AZ150 and galvanised Z450 conform to AS1397. Stramit has a comprehensive range of Colorbond® colours as standard. Refer to the BlueScope Steel Colorbond®18 colours chart available from Stramit, and ask your nearest Stramit location for colour availability. 

STRAMIT SPEED DECK® 500 DECKING -
SHEET MASS (kg/m2 of roof area)
 Zincalume®Colorbond®Galvanised
0.42mm BMT4.724.805.14
0.48mm BMT5.365.445.78
0.60mm BMT6.646.727.06

Adverse Conditions

Stramit Speed Deck® 500 decking will give excellent durability in almost all locations. With all of its fastenings protected beneath the decking, Stramit Speed Deck® 500 decking can be expected to outlast through-fixed roofing. It is however important to choose the correct coating for each application environment. The table below shows the suitability of coating types for different exposure conditions. 

suitability of
coating type
site exposure condition
benignmoderateseverevery severe
Zincalume® AZ150??
Galvanised Z450?
Colorbond® XRW?
Colorbond® UltraN/AN/A?

? Question marks indicate conditions where durability may be diminished, depending on the particular application.

The approximate site exposure conditions in the table above are defined below.

site exposure
condition
distance of site from
rough
active surf
calm, still
salt water
industrial
emission
fossil fuel
combustion
benign1000m +100m +500m +500m +
moderate400m-1000m0-100m250m-500m250m-500m
severe100m-400mN/A100m-250m100m-250m
very severe0-100mN/A0-100m0-100m

The suitability and exposure tables above are guidelines only; conditions will vary from site to site. If in any doubt about the choice of coating for a particular application contact your nearest Stramit office for advice.

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 Zincalume, Colorbond XRW and galvanised roofs avoid copper, lead, green or treated timber, stainless steel and mortar or concrete.
  • In addition galvanised roofs should not receive drainage from aluminium or any inert materials, such as plastics, glass, glazed tiles, Colorbond and Zincalume.

Contact Stramit for more detailed information.

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)
  • The University of Sydney
  • Monash University
  • CSIRO
  • 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

The roofing/walling shall be 0.42 (0.48 or 0.60) mm BMT Stramit Speed Deck® 500decking, 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 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 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.

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 section 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.

STRAMIT SPEED DECK® 500 DECKING – MAXIMUM SPAN CHART (mm)
 roofswallsoverhangs
bmt
(mm)
Pressure (kPa) internal
(end) span
combination
Pressure (kPa) internal
(end) span
combination
 
service
-ability
strengthdouble
spans
equal
spans
service
-ability
strengthdouble
spans
equal
spans
free
edge
stiffened
edge
N1 or Region A (sheltered suburban)
0.420.761.35110011001500(1250)0.611.04220020002200(1800)100300
0.480.761.35170017002100(1750)0.611.04275026002750(2250)150450
0.600.761.35170017002100(1750)0.611.04300026503000(2500)250500
N2 or Region B (sheltered suburban) and Region A (exposed suburban)
0.420.781.94110011001500(1250)0.611.49180016501800(1500)100300
0.480.781.94170017002100(1750)0.611.49250023502500(2050)150450
0.600.781.94170017002000(1650)0.611.49235020502350(1950)250500
N3 or Region A (rural) and Region B (exposed suburban)
0.421.182.96110010501150(950)0.922.25140012501400(1150)100250
0.481.182.96170017001850(1500)0.922.25215019502150(1750)150400
0.601.182.96150014001500(1250)0.922.25180016001800(1500)200450
Internal spans must have both end spans 20% shorter. Values are only valid for use with steel members of 0.75mm or thicker. For more specific applications Stramit Speed Deck® 500 Decking must be designed to the pressure and foot traffic limitations below.

Pressures

STRAMIT SPEED DECK® 500 DECKING – SERVICEABILITY LIMIT STATE CAPACITY
thickness
bmt (mm)
fasteners per sheet
at each support
span
type
pressure (kPa) at the spans (mm) shown
6009001200150018002100240027003000
 1 clipinternal2.772.151.731.451.240.990.760.580.44
0.42andequal2.832.201.771.481.271.010.770.590.45
 2 screwsdouble3.252.532.041.701.461.160.890.680.52
 1 clipinternal2.922.802.351.961.641.391.190.990.62
0.48andequal2.992.862.402.001.681.431.221.010.64
 2 screwsdouble3.443.292.762.301.931.641.401.160.73
 1 clipinternal3.944.093.462.621.941.511.231.040.89
0.60andequal4.034.183.542.681.981.551.261.060.91
 2 screwsdouble4.634.814.073.082.281.781.451.221.05
STRAMIT SPEED DECK® 500 DECKING – STRENGTH LIMIT STATE CAPACITY (Non-cyclonic)
thickness
bmt (mm)
fasteners
per sheet
span
type
pressure (kPa) at the spans (mm) shown
6009001200150018002100240027003000
 1 clipinternal8.044.492.942.081.531.160.890.680.52
0.42andequal6.673.372.441.721.270.960.740.570.43
 2 screwsdouble8.044.492.942.081.531.160.890.680.52
 1 clipinternal12.508.966.214.463.252.371.691.160.73
0.48andequal10.387.445.153.702.701.961.400.960.61
 2 screwsdouble12.508.966.214.463.252.371.691.160.73
 1 clipinternal12.507.604.533.082.281.781.451.221.05
0.60andequal10.386.313.762.561.891.481.201.010.87
 2 screwsdouble12.507.604.533.082.281.781.451.221.05

Foot Traffic 

Foot traffic limits for Stramit Speed Deck® 500decking 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.

For more information on foot traffic performance of Stramit Speed Deck® 500 decking and other Stramit® roofing profiles refer to Stramit’s Foot Traffic Guide. 

STRAMIT SPEED DECK® 500 DECKING –
FOOT TRAFFIC LIMITED SPANS (mm)
thickness
bmt (mm)
span
type
foot traffic limits
heavynormalcontrolled
 internal-15002400
0.42equal-11002100
 double-11002100
 internal-21003000
0.48equal-17002400
 double-17002400
 internal110027003600
0.60equal70022002700
 double70022002700
Tables are based on tests to AS1562 and AS4040 parts 0 and 1

For more information on foot traffic performance of Stramit Speed Deck® 500decking and other Stramit® roofing profiles refer to Stramit's Foot Traffic Guide.

Spring Curving

Stramit Speed Deck® 500 decking can be spring-curved, concave and convex, including curved ridges, provided it is sealed at the apex and within the recommended limits below:

STRAMIT SPEED DECK® 500 DECKING -
SPRING-CURVED RADII LIMITS (m)
 performance restrictedrestricted by drainage at the
rainfall intensities shown
bmt
(mm)
minimum*
radius
lowest
neutral radius
370
mm/hr
220
mm/hr
150
mm/hr
0.4270*198210354>500
0.4850*159210354>500
0.60n o   d a t a       a v a i l a b l e
* 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. These reductions apply proportionately up to the lowest neutral radius.

For more comprehensive information on spring curving Stramit Speed Deck® 500decking and other Stramit® roofing profiles refer to the Stramit Spring Curving Guide.

Designing for Snow

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

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. Stramit Speed Deck® 500 decking has excellent resistance to the problems associated with thermal expansion. Nevertheless sheet lengths should be limited to those shown below. 

STRAMIT SPEED DECK® 500 DECKING –
MAXIMUM SHEET LENGTH (m)
roof colourlightdark
Flat3525
Spring-curved3020

Significant failures of pierced fixed roofing have occurred on commercial buildings where dimensional changes from thermal expansion have not been accurately incorporated in the roof design. These can result in elongation of fastener penetrations, consequent water leaks, fastener failure and unacceptable frictional noise. Through-fixed profiles which incorporate special sealing may exacerbate these problems.

Water Carrying

Stramit Speed Deck® 500 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. 

STRAMIT SPEED DECK® 500 DECKING –
MINIMUM ROOF SLOPE (degrees)
Rainfall Intensity
mm/hr
total roof run length (m)
5060708090100110120130140150
150 1.01.11.41.7
175Minimum 1.01.41.82.22.7
200Slope 1° 1.01.21.62.22.63.23.8
225 1.01.31.72.32.83.64.24.9
250 1.01.21.72.43.03.84.65.56.5
275 1.01.72.33.03.84.85.76.77.8
300 1.01.42.12.83.84.85.96.98.29.7
325 1.01.72.63.54.55.56.98.29.812
3501.01.32.23.04.15.36.58.09.71214
3751.01.72.63.74.86.37.79.4121416
4001.02.13.14.45.67.38.811131517

For more information on water carrying performance of Stramit Speed Deck® 500 decking and other Stramit® roofing profiles refer to Stramit’s Roof Slope Guide. Maximum water protection is also ensured by the absence of faster penetrations when using Stramit Speed Deck® 500 decking.

Installation

Fasteners

All fastening screws must conform to AS3566 – Class 3.
For connecting clips to purlins use: 

For steel (0.75bmt or greater)
- No. 10 x 16mm wafer-head self-drilling (2 per clip) and threading screws (available pre-loaded into clips in some locations)
For timber
- No. 10 x 25mm wafer-head type 17 self-drilling screws (2 per clip), or
- 60 x 3.75mm galvanised fluted drive nails (4 per clip)

Accessories

Use only the correct, authentic, Stramit accessories: 

Stramit Speed Deck® 500 Clip
- supplied in easy to handle boxes of 50 clips
Stramit Speed Deck® 500 End Cap
- used with silicone sealant for roof penetrations

Installation

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® 500decking is a straight forward 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.
  • 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 Colorbond® finish with Stramit supplied touch-up paint.

Insulation

Insulation blanket up to 50mm in thickness can be readily used.  

Walking

As with all roofing products, we recommend extra caution be taken when walking on the roof. When walking on Stramit Speed Deck® 500 decking roofing always wear flat rubber soled shoes and place feet only in the pans, taking care to avoid the last pan or two near edges of the metal roof area. 

Walk only in pans, or on ribs at purlin supports

Good Practice

Stramit recommends that good trade practice be followed when using this product, such as that found in Australian Standards Handbook HB39.

 

Procurement

Prices

Prices on Stramit Speed Deck® 500decking and its accessories can be obtained from your nearest Stramit location or distributor of Stramit® products. As Stramit does not provide an installation service, ask your tradesperson for a supply and fix price. Contact your nearest Stramit location for the names of tradespersons in your area. 

Related Products

Ridge Capping
standard or custom dimensions
Flashings
a range of custom flashings
Filler Strips
top and bottom; for eaves, ridge and joint sealing
Use only where sealing is preferred to ventilation
Insulation & roofing mesh
a range of mesh, sisalation, plain & foil backed blanket
Translucent sheeting
fibreglass sheeting in a range of shades and densities

Length 

Stramit Speed Deck® 500decking is supplied cut-tolength. When designing or transporting long products ensure that the length is within the limit of the local Transport Authority regulations. The manufacturing tolerance on the length of product supplied is +0, -15mm.

Ordering

Stramit Speed Deck® 500decking can be ordered directly, through distributors, or supplied and fixed from a roofing contractor.

Delivery/Unloading

Delivery can normally be made within 48 hours, subject to the delivery location, quantity and material availability, or can be at a pre-arranged date and time. Please ensure that suitable arrangements have been made for truck unloading, as this is the responsibility of the receiver. Pack mass may be up to one tonne. When lifting Stramit Speed Deck® 500 decking, care should be taken to ensure that the load is spread to prevent damage.

Handling/Storage

Stramit Speed Deck® 500decking should be handled with care at all times to preserve the product capabilities and quality of the finish. Packs should always be kept dry and stored above ground level while on site. If the sheets have become wet, they should be separated, wiped and placed in the open to promote drying.

 

Extra

Maintenance

Exterior surfaces of metal products unwashed by rain can benefit from occasional washing to remove build-up of corrosive salts. Walls beneath eaves or awnings are such a situation.

Further Information

As well as our standard range of Technical Manuals, Installation Leaflets, Case Studies and other promotional literature Stramit has a series of Guides to aid design. Please contact your nearest Stramit location for any of these guides or other literature’.

Other Products

Stramit offers a wide range of building products, including: 

  • Purlins and girts
  • Formwork decking
  • Roof and wall sheeting
  • Lightweight structural sections
  • Truss components
  • Gutters and downpipes
  • Fascias
  • Custom flashings
  • Insulating products
  • Fasteners   

Patents

Stramit Speed Deck® 500 decking is protected by a registered design.

References

In preparing this document reference has been made to:    

  • Standards Australia Handbook – HB39
    (Installation code for metal roof and wall cladding)
  • Standards Australia Handbook – HB106
    (Guidelines for the design of structures in snow areas)
  • BlueScope Steel – Technical Bulletin TB-4
    (Maintenance of Colorbond® prepainted steel roofing)
  • BlueScope Steel – Technical Bulletin TB-1
    (Steel roofing and walling products – selection guide)

Availability

Product Availability 

NSWACT TAS VIC SA WA QLD NT
NNYNNNNN

Y - Yes     N - No     S - Subject to project size

Alternatives