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Smartspan® Roofing & Wall Cladding



$33.25 $23.34
$27.71 $19.45 per linear meter
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About this product

With a contemporary square corrugated profile, Smartspan roofing and walling has a nine-rib design for maximum strength on domestic and industrial cladding projects.

For trade and project quantity discounts:

Form and Function

Strong, bold and stylish roofing and wall cladding

Strong, bold and stylish, Smartspan has a ‘square corrugated' form that provides an interesting blend of light and shade wherever it is placed. Smartspan has the looks and versatility to allow it to blend easily with any building style. Its strong nine rib design lends itself for use on roofing, walling and fencing. Smartspan is used on walkways, school buildings, or heavy duty walling in commercial and industrial applications. Smartspan is ideal for architects and builders who are trying to achieve a different look, with maximum serviceability.

Made from high tensile steel for strength and impact resistance, it is ideal for long length industrial uses. Smartspan can be used in continuous lengths, at low roof pitches with generous support spacings. This can provide a real cost saving on most projects. The 24mm high rib is strong and able to channel water quickly. It has a non-syphoning side lap which reduces the risk of moisture transfer between sheets due to capillary action, thus reducing the risk of roof leakage.

Available Colours

Custom made for your project

Smartspan sheets longer than 1.2 metres are rolled to the specific length you require, provided the appropriate transport and handling can be arranged. If lengths longer than ten metres are required, consult your nearest Stratco for advice on handling and transport. 

To give your roof a professional finish, painted self drilling screws are available. Stratco offer a complete range of flashings and accessories for use with Smartspan, and can provide professional advice on specific flashings.

Spring Curving

Smartspan may be spring curved using purlins at a maximum spacing of 1200mm for .42mm BMT and 1400mm for .48mm BMT. The curve must have a minimum radius of 20m for .42mm and .48mm BMT. The maximum radius is 60m to allow for sufficient drainage over a crest. The side laps must be sealed wherever the roof pitch is less than the recommended minimum.

Maintenance Requirements

The performance of Smartspan over time depends on its correct application and maintenance. Maintenance should be performed as often as is required to remove any dirt, salt and pollutants. Where used in severely corrosive environments, cleaning should be performed more often. It is important that screws have the same life expectancy as the cladding you have specified.

Ordering Smartspan

Sheets are available custom cut, allowing you to minimise waste, and enhance your design options. Smartspan is available in un-painted zinc/al, and in an attractive range of factory pre-painted colours. Subject to the delivery location, quantity and material availability, delivery is usually within 48 hours, or at an agreed time that suits your building schedule. Unless advised differently, a one tonne maximum is usually applied to larger packs. Arrangements for unloading the truck are the responsibility of the customer, and should be arranged before ordering. When unloading you must ensure the load is adequately spread using spreaders and slings to prevent damage. If packs are to be loaded above structural members, they must be of sufficient strength, such as over portal frames, or braced roof trusses.


Material Specifications

Material Specifications
Material Properties Finish 0.42 BMT 0.48 BMT
Total Coated Thickness (TCT) mm Zinc/al 0.47 0.53
Colour 0.50 0.56
Mass (kg / linear metre) Zinc/al 3.26 3.70
Colour 3.32 3.76
Mass (kg / square metre) Zinc/al 4.66 5.28
Colour 4.74 5.37
Yield (square metre / tonne) Zinc/al 214.6 189.4
Colour 211.0 186.2
Tensile Strength (MPa) Zinc/al & Colour 550 550
Width Coverage (mm) Zinc/al & Colour 700 700
Sheet Tolerances (mm) Length & Width ±5 ±2 ±5 ±2
Minimum Roof Pitch Zinc/al & Colour

Design considerations

Smartspan has a 700mm coverage and the minimum recommended roof pitch is two degrees (1 in 30). Smartspan is subject to thermal expansion. Darker colours are affected more than light, and spring curved sheeting needs additional consideration. The maximum length before an expansion joint is needed is 24 metres for light colours, and 16 metres for dark colours. For spring curved sheeting it is 20 metres for light colours and 16 metres for dark colours.


The Wind Capacity Tables are based on testing in accordance with AS1562.1-1992 and AS4040.0, 1 & 2- 1992. Span tables have been developed by determining wind pressures in accordance with AS4055-2006 for domestic applications and AS/NZS 1170.2:2002 for all other applications. Capacity tables are in limit state format.


Spans are determined by wind speeds for non-cyclonic areas. For domestic applications, the pressures and spans are based on a maximum: eaves height of six metres, roof pitch of 35 degrees and total roof height of 8.5 metres. For commercial and industrial applications, tables are based on a maximum overall height of ten metres and a 500 year design return period.

Roofing calculations are based on Cpe=-0.9 and Cpi=0.2, walling is based on Cpe=-0.65 and Cpi=0.2. A local pressure factor, Kl=2.0 has been used for all roofing and walling spans for both strength and serviceability limit states. Roof spans allow for loads incidental to maintenance.

All pressures have been determined assuming the wind loading in any direction is not affected by topography. The following shielding factors have been used for each of the terrain categories: Category 3 = 0.85, Category 2.5 = 0.95, and Category 2 = 1.

The carport and verandah spans only apply to structures not enclosed by peripheral walls. Spans are based on Cpn=-0.9 and Kl=1.5 applied over the entire span, and are suitable for all span types. Loads on supporting purlins may limit these spans.

Stratco can provide additional engineering advice if any design parameters vary from those above.


Wind Load Conversion

For domestic applications use the appropriate wind classification for the area. To read the span tables for commercial and industrial applications, select the region and category for the area, then convert it to the correct classification using table below.

Wind Load Conversion
Wind Classification
Region & Category
(Commercial / Industrial)
N1 (W28) Reg A, Cat 3
N2 (W33) Reg A, Cat 2.5 - Reg B, Cat 3
N3 (W41) Reg A, Cat 2 - Reg B, Cat 2.5
N4 (W50) Reg B, Cat 2

Maximum Recommended Spans

Maximum Recommended Spans (mm)
Span Type Roofing (BMT) Walling (BMT)
0.42 mm 0.48 mm 0.42 mm 0.48 mm
Single Span 1350 2000 2550 2600
End Span 1800 2300 3200 3300
Internal Span 2400 3000 3500 3600
Un-stiffened Overhang 200 250 200 250
Stiffened Overhang 500 600 500 600

Roofing spans are limited, based on typical maintenance foot traffic. Walling spans are based on N1 (W28) wind loading. All spans are based on four fasteners per sheet, per support. The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Domestic Carport / Patio Spans

Domestic Carport / Verandah Spans (mm)
Wind Classification Base Metal Thickness
0.42 mm 0.48 mm
N1 (W28) 2500 2700
N2 (W33) 2500 2700
N3 (W41) 2100 2300
N4 (W50) 1800 2000

The values are for use with steel supports with a minimum thickness of 0.75mm, G550.


Three Fastener Spans (mm)
BMT Application Span Type N1 (W28) N2 (W33) N3 (W41) N4 (W50)
0.42 Roofing Single 1350 1350 1350 -
End 1800 1800 1700 -
Internal 2400 2000 1800 -
Walling Single 2300 1950 1750 1500
End 3000 2300 1950 1550
Internal 3300 2500 2000 1750
0.48 Roofing Single 2000 1850 1500 -
End 2300 2100 1800 -
Internal 3000 2350 2000 -
Walling Single 2350 2100 1850 1750
End 3000 2350 2100 1850
Internal 3400 2950 2350 1950


Four Fastener Spans (mm)
BMT Application Span Type N1 (W28) N2 (W33) N3 (W41) N4 (W50)
0.42 Roofing Single 1350 1350 1350 1350
End 1800 1800 1800 1500
Internal 2400 2400 2250 1600
Walling Single 2550 2050 1900 1750
End 3200 2650 2150 1800
Internal 3500 3100 2750 1950
0.48 Roofing Single 2000 2000 1800 1700
End 2300 2300 2100 1750
Internal 3000 2850 2350 2000
Walling Single 2600 2250 2050 1950
End 3300 2700 2300 2150
Internal 3600 3300 2850 2400

The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Wind Capacities

Three Fastener Wind Capacities (kPa)
BMT Span Type Limit State Span (mm)
1200 1500 1800 2100 2400 2700 3000 3300 3600 3900
0.42 Single Serviceability 2.09 1.64 1.18 0.73 0.58 0.43 - - - -
Strength 4.74 4.30 3.87 3.43 3.07 2.71 - - - -
End Serviceability 2.41 1.97 1.52 1.08 0.93 0.79 0.64 0.49 0.35 -
Strength 3.95 3.44 2.92 2.40 2.16 1.92 1.67 1.43 1.19 -
Internal Serviceability 2.82 2.24 1.67 1.09 0.98 0.87 0.75 0.64 0.53 -
Strength 4.96 4.09 3.22 2.35 2.13 1.91 1.69 1.47 1.25 -
0.48 Single Serviceability - 1.70 1.32 0.94 0.55 0.47 0.38 0.30 - -
Strength - 4.75 4.21 3.67 3.13 2.74 2.34 1.95 - -
End Serviceability - 2.05 1.67 1.29 0.91 0.77 0.63 0.48 0.34 0.20
Strength - 4.01 3.48 2.96 2.44 2.13 1.83 1.52 1.22 0.91
Internal Serviceability - 2.30 1.94 1.57 1.21 1.06 0.91 0.77 0.62 0.47
Strength - 4.33 3.72 3.11 2.49 2.18 1.87 1.56 1.24 0.93


Four Fastener Wind Capacities (kPa)
BMT Span Type Limit State Span (mm)
1200 1500 1800 2100 2400 2700 3000 3300 3600 3900
0.42 Single Serviceability 2.73 2.12 1.52 0.91 0.71 0.51 - - - -
Strength 6.06 5.34 4.62 3.90 3.50 3.11 - - - -
End Serviceability 3.36 2.67 1.97 1.27 1.09 0.91 0.73 0.55 0.36 -
Strength 5.27 4.51 3.76 3.00 2.74 2.48 2.22 1.96 1.70 -
Internal Serviceability 4.27 3.44 2.61 1.77 1.52 1.27 1.03 0.78 0.53 -
Strength 5.55 4.78 4.00 3.23 2.95 2.67 2.40 2.12 1.84 -
0.48 Single Serviceability - 2.20 1.70 1.20 0.70 0.57 0.43 0.30 - -
Strength - 6.10 5.53 4.95 4.38 3.86 3.33 2.81 - -
End Serviceability - 2.91 2.31 1.72 1.12 0.95 0.78 0.61 0.44 0.27
Strength - 5.10 4.44 3.78 3.12 2.78 2.45 2.12 1.79 1.46
Internal Serviceability - 3.57 2.90 2.22 1.55 1.34 1.14 0.93 0.73 0.53
Strength - 5.67 4.96 4.26 3.55 3.15 2.74 2.33 1.92 1.51

The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

Water Carrying Capacity

Maximum Roof Run For Drainage (m)
Roof Slope Peak Rainfall Intensity
150mm/hr 180mm/hr 200mm/hr 250mm/hr 300mm/hr 350mm/hr 400mm/hr 450mm/hr
52 43 39 31 26 22 19 17
70 58 52 42 35 30 26 23
7.5° 81 67 61 48 40 34 30 27
10° 90 75 68 54 45 38 34 30
15° 106 88 79 63 53 45 39 35
22° 119 99 89 71 59 51 44 39

*Note: Roof pitch>20° requires other means of verification, hence, values are limited to 20° roof pitch.

The peak rainfall intensities shown represent a 100 year average recurrence interval (ARI) for a five minute rainfall duration. If roof penetrations exist, the total roof run will generally be greater than the distance from ridge to eaves at the location the penetration interferes with the runoff. Contact Stratco if further advice is required.

Fixing Recommendations

Smartspan sheets should be laid into the prevailing wind and sit neatly on the preceding roof sheet, as shown in the laying procedure below. They should be fixed within the recommended support spacings. Avoid ‘stretching’ the width of the sheet when installing, as this could allow wind and rain to enter. If the spans exceed 900mm for roofing or 1200mm for walling, it is recommended that side lap fasteners are used at mid-span. Side lap fixing will help maintain a weather proof seal and will secure the overlap especially when the roof is walked on occasionally. This is best done with either 8 x 12mm self drilling stitching screws or a 3.2mm blind rivet (rivets should be sealed to prevent water penetration). On roofing, at the end of the sheets, the valleys of each corrugation should be turned up at crest of the roof and down into the gutter using a turn up/down tool.

Fixing and Laying Directions

Note: The following recommendations apply to non-cyclonic areas.

  • All fasteners must have neoprene washers.
  • Roof and wall internal supports require three fasteners per sheet.
  • End supports and laps require four fasteners per sheet.
  • Side lap fixing is recommended to maintain a weather proof seal and secure the overlap, especially when the roof is walked on occasionally. Use either 8x12 mm self drill stitching screws or 3.2 mm sealed blind rivets.
  • Secure side lap fasteners at mid span when the spans exceed 900mm for roofing and 1200mm for walling.
  • The below fastener sizes are suitable for fixing over an insulation blanket up to 55mm thick. For thicknesses up to 100mm, the next standard screw length to that indicated is to be used.

Roof Laying Procedure

Prevailing Wind →

← Laying Direction


Fastener Selection

Fixing to Steel Roofing

12 x 45mm self drilling and tapping screw or M6 x 50mm TS self drilling screw*


Fixing to Timber Roofing

12 x 65mm type 17 hex head screw or M6 x 65mm TS self drilling screw with neoprene washer


Fixing to Steel Walling

10 x 16mm self drilling and tapping screw with neoprene washer


Fixing to Timber Walling

10 x 25mm type 17 hex head screw with neoprene washer


*When fixing to 0.55mm thick roof battens; crest fix with M6 x 50mm TS self drilling screws with neoprene washers. Indicated spans will still apply.

Fastener Positions

Roofing - Three Fastener Location
Internal Supports


Roofing - Four Fastener Location
End Supports and End Laps


Walling - Three Fastener Location
Internal Supports


Walling - Four Fastener Location
End Supports and End Laps


Walking on Smartspan

When walking on Smartspan roofing, it is recommended you walk over the purlins to avoid any damage. Wear flat, rubber soled shoes and walk flat footed, spreading your weight over as many crests as possible. For carport and verandah applications, crawl boards should be used to avoid damage during installation and maintenance.

Using Smartspan

Stratco Smartspan will have a long, useful life if used according to Stratco specifications. While roofing materials in outer urban and rural areas may have a life-span in excess of 30 years, this can reduce to only a few years in coastal and industrial environments.

Zinc/al and pre-painted steel should not be used in very aggressive areas such as near swimming pools and spas. It is important that dirt, soil, compost, paving sand, or other materials which retain moisture are not placed against steel sheeting. Concrete should not be poured against zinc/al material. Check with Stratco before using in these severe environments.

Incompatible Metals

The best way of reducing corrosion is to keep incompatible metals apart. Zinc/al and prepainted steel cannot be used with lead, copper and monel. Galvanised steel and pure zinc material can be used with zinc/al, but you must avoid water run-off from zinc/al onto galvanised material. Fixings such as rivets and self-drilling screws must be compatible with the material they are fixing.

Handling and Cutting of Smartspan

For safety, wear gloves when handling Smartspan. Ensure your hands or gloves are clean, especially when handling zinc/al which can mark. Use a coloured pencil for marking steel, as lead or black pencils contain graphite which promotes rusting. Smartspan is best cut using tin snips, but for larger cuts it may be necessary to use a power saw with a steel cutting blade or a power nibbler. Avoid using abrasive discs as they can cause burred edges and coating damage. Where possible cut sheets on the ground, and always clean off any swarf and metal filings progressively during the installation. Dispose of off-cuts carefully.

Insulation and Sealants

The use of blanket insulation is recommended in domestic roofing to assist in temperature, condensation and sound control. Smartspan can be used with an insulating blanket up to 55mm thick. Increased thicknesses require longer fasteners and greater care when installing.

When choosing a silicone sealant, ensure it is suitable for roofing and guttering use and of a non-acetic, amine free, neutral cure type. Sealants that smell of ammonia, vinegar or lemons are not usually suitable.

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