Please refer to the Stramit Roof and Wall Flashing Architectural Detailing Design Guide.

The roofing/walling shall be 0.55 mm BMT Stramit SharpLine^® cladding in continuous lengths with 25 or 38mm high ribs and flat trays spaced at specified centres to suit clip or direct fixing methods.

Sheeting material shall be protected steel sheet to Australian Standard AS1397, with a minimum yield stress of 300MPa (Grade G300) 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 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. All debris (nuts, screws, cuttings, filings etc.) shall be cleaned off daily.

A NATSPEC work section is available for this product. Download

Please contact Stramit's Technical Services team for information regarding cyclonic data for Sharpline^® cladding.

SharpLine^® profiles use the fasteners below.

All fasteners with Phillips head.

Stramit roofing, cladding, rainwater and structural building products are manufactured from steel produced by BlueScope^® Steel or Pacific Coil Coaters (through Selection Steel).

Fire resistance is such an important topic and one that we take seriously at Stramit.

Stramit^® roofing, cladding, rainwater and structural building products are manufactured from steel produced by BlueScope^® Steel or Pacific Coil Coaters (through Selection Steel). Both organisations have had independent tests on their materials carried out by CSIRO or AWTA. The testing was conducted in accordance with the Australian Standard AS1530.3 ‘Simultaneous Determination of Ignitability, Flame Propagation, Heat Release and Smoke Release.’ All materials had a surface finish less than 1mm in thickness and a Spread of Flame Index of 0. When tested to AS5637.1, Bluescope^® COLORBOND^® Steel has a Product Group Number classification of 1.

Stramit^® products made from these steel sources and with the tested finishes would be considered non-combustible according to NCC 2022 Volume One clause C2D10 (6)(e) and Volume Two clause H3D2 (1)(e).

It is important to note that Stramit^® sheeting is only one component used in construction of these building elements, and other components must also meet the necessary requirements to satisfy the criteria.

For more information refer to the Stramit Flammability Guide.

SharpLine^® cladding roofs may be subjected to foot traffic and the spans below conform to AS1562.1 with 1.1kN load as specified in AS/NZS1170.1 for R2 – Other Roofs.

• Controlled – spans that conform to AS1562.1 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.

+ on plywood base. See note under wind pressure tables for details. Tables are based on tests to AS1562.1 and AS4040 parts 0 and 1.

Stramit's SharpLine^® cladding is manufactured from G300 colour coated steel or zinc-aluminium alloy coated steel. In some locations galvanised and severe environments colour coated steel may be available by arrangement.

Colour-coated steels are in accordance with AS/NZS 2728:2013 - Type 4 and, for the substrate, with AS 1397:2021. Aluminium-zinc-magnesium alloy coated AM100/AM125, zinc-aluminium alloy coated AZ150 conforms to AS 1397:2021.

Stramit has a comprehensive range of colours as standard. Ask your nearest Stramit location for colour availability.

The minimum roof slope for Sharpline^® cladding is 3 degrees (1 in 20). Please note: Roof pitches below 7.5° for SharpLine^® direct fix cladding, and 5.0° for SharpLine^® clip fix profiles require sealed side laps. All roof lengths above 5.0m also require sealed side laps.

Wide, flat profiles may be subject to "oil canning", a perceived waviness in the material. This may happen in any wide, flat profiles and is usually an aesthetic issue only and the structural performance is not affected.

Since many uncontrollable factors are involved, no manufacturer can realistically assure the total elimination of oil canning.

With careful attention to the production and selection of material, to the panel design and to installation practice, oil canning can be effectively minimised.

To minimise the appearance of oil canning, use narrower profiles and lighter colours in matt finishes, and ensure the sub structure is in a flat pane and fasteners are installed correctly.

Stramit tests to Australian Standard AS1562.1 called up in the National Construction Code (2019) to provide span load tables.

The spans shown below are based on the direct pressure testing method descibed in the current version of As1562.1 and take account of foot traffic and wind resistance including local pressure zone effects.

Pressures are based on AS4055 or AS1170.2. 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.

Data for the most popular profiles are shown below.

* Where roof pitch is less than 10 degrees, use spans given in red italics for roof corners. Internal spans must have both end spans 20% shorter.

+ SharpLine^® cladding to be fixed to minimum 15mm thick CD Grade plywood base at spans given in the table above. Maximum span of plywood 600mm

Deflection under wind uplift not accounted for. If checking for this limit, please refer to serviceability pressures given in the wind pressure tables.

Values are only valid for use on steel supports 0.55mm G550 or thicker. Where thinner supports are used, fastener capacity must be checked. For 0.48mm thick battens, use #10x25 wafer head Type 17 screws for fixing and reduce strength capacity above by 15%.

All spans and pressures based on edge and corner areas of roof, and edge area of wall. In some instances, better spans may be possible away from edges in roof.

TC: Terrain category. FS, PS, NS: Full, partial and no shielding. Internal pressure coefficient +0.2/-0.3.

For more specific applications, SharpLine^® cladding must be designed to the pressure and foot traffic limitations.

SharpLine^® cladding is not suitable for spring curving applications. It is most important that the structure behind the SharpLine^® cladding is the one flat pane, so any installation distortions are reduced.

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 cured will affect its ability to resist without problems.

If longer lengths are required, sheet lengths should be limited to those shown below.

Stramit's SharpLine^® cladding has excellent water-carrying capacity. Roof slopes can be as low as 3^° 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.

All SharpLine^® cladding profiles can be used at 3^° slope for up to 30 metres run length and rainfall intensities up to 400mm/hr.

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

For more information on water-carrying performance, refer to Stramit’s Roof Slope Design Guide.

Note: Computations based on AS1562.1

Stramit tests to Australian Standard AS1562.1 called up in the National Construction Code (2022) to provide wind pressure tables.

The table below shows wind pressure capacity based on the direct pressure (airbox) test method.

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

Note: Values are only valid for use on steel supports 0.55mm G550 or thicker. Where thinner supports are used, fastener capacity must be checked. For 0.48mm thick battens, use #10x25 wafer head Type 17 screws for fixing and reduce strength capacity above by 15%. Internal spans must have both end spans 20% shorter.
ł Where used on roofs, SharpLine™ cladding direct fix 490, 465 and clip fixed 520, 485 to be fixed to minimum 15mm thick CD Grade plywood base at maximum 450mm spans.

SharpLine® cladding is readily installed with or without fiberglass insulation blanket.

The use of heavy-duty sarking is recommended to ensure weather tightness. If practical lay sheets in the opposite direction to prevailing weather.

Installation of SharpLine® cladding is a straight-forward procedure using the following fixing sequence for either SharpLine® Clip or SharpLine® Direct fix.

SharpLine® Clip Fix Cladding:

1. Ensure all purlins/battens are in line and correctly installed and that plywood substrate, mesh, and blanket (if specified) are in place.

2. Use a string line, or the edge of the first sheet to align the first row of fixing clips. Attach the fixing clips to the structure using the correct fasteners.

3. Position the first sheet over the clips ensuring the correct sheet overhangs (minimum 50mm).

4. Fasten through the vertical upstand to attach the sheet to the clip.

5. Install fixing clips to each batten using two fasteners, placing the clip over the trailing edge of the cladding sheet.

6. Carefully lay the following sheet in place and press the interlock together along the sheet, ensuring the interlock is fully engaged. If needed, use a rubber mallet for assistance, taking care not to damage the rib. Note: If the roof pitch is less than 7.5 degrees, or the roof run length exceeds 5 meters, apply silicone sealer below the underlap rib, prior to laying the following sheet.

7. Continue to install fixing clips and subsequent sheets, checking that sheet ends at the lower edge are exactly aligned.

8. Measure the overall cover width at the top and bottom of the sheets from time to time to avoid “fanning”.

9. For roofs, turn up the pans at the upper roof edge and install flashings. Turn down the bottom end of the sheet to facilitate drainage into gutters.

10. Clean up the roof after each day’s work, removing all screws, cuttings, swarf etc., and leave roof clean and watertight.

SharpLine® Direct Fix Cladding:

1. Ensure all purlins/battens are in line and correctly installed and that plywood substrate, mesh and blanket (if specified) are in place.

2. Either cut a full-length sheet of SharpLine™ direct fix cladding near the trailing edge to create a starter strip or install SharpLine™ cladding fixing clips to locate the first sheet (see steps 2, 3, and 4 for SharpLine™ clip fix cladding installation).

3. Position and fix the first sheet over theclips ensuring the correct sheet overhangs (minimum 50mm). Ensure the screws are not overtightened.

4. Carefully lay the following sheet in place and press the interlock together along the sheet, ensuring the interlock is fully engaged. If needed, use a rubber mallet for assistance, taking care not to damage the rib.Note: If the roof pitch is less than 7.5 degrees, or the roof run length exceeds 5 metres, apply silicone sealer below the underlap rib, prior to laying the following sheet, then fasten down with screws.

5. Continue to install subsequent sheets, checking that sheet ends at the lower edge are exactly aligned.

6. Measure the overall cover width at the top and bottom of the sheets from time to time to avoid “fanning”.

7. For roofs, turn up the pans at the upper roof edge and install flashings. Turn down the bottom end of the sheet to facilitate drainage into gutters.

8. Clean up the roof after each day’s work, removing all screws, cuttings, swarf etc., and leave roof clean and watertight.

As with all roofing products, we recommend extra caution be taken when walking on the roof. When walking on SharpLine^® roofing, always wear flat rubber soled shoes and place feet only in the trays, taking care to avoid the last tray or two near edges of the metal roof area. Walk close to supports to avoid damage.