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Material Specifications

Design considerations

The minimum recommended roof pitch for Topdek 700 is one degree (1 in 60). The 700mm coverage of Topdek 700 provides easy handling and installation. Topdek 700 roofing is subject to thermal expansion, particularly on darker colours. The maximum length before an expansion joint is required is 24 metres for lighter colours, and 16 metres for darker colours.

Compliance

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

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 2.0 below.

Maximum Recommended Spans

Domestic Carport / Verandah Spans

Wind Capacities

Water Carrying Capacity

Topdek 700 concealed clip

The most important feature of Topdek 700 is the single piece concealed clip. Its innovative design ensures maximum performance of the roofing, superior spanning and ease of installation. It is suitable for a variety of industrial and commercial uses, and can be used where a low roof pitch is required and security is important. Buildings such as shopping centres, hospitals, industrial storage, factories and warehouses lend themselves to this style of roofing for its strong, reliable, no fuss application.

• Specially designed single piece galvanised steel roof clip eliminates the possibility of mechanical failure.
• The clip is simply fastened onto the purlin and the roof deck locks straight onto the clip for fast and easy installation.
• The secure locking action ensures the deck is water tight and protects against entry.
• All fasteners are covered by the deck helping to minimise fixing corrosion.
• Specially designed recesses for fastening avoid denting the roof sheet.
• Allows for bracket adjustment to accommodate out of square buildings or installer requirements.