Roof profile curved and cranked to create unique roof for Cell C

by Tania Wannenburg
Roof profile curved

Global Roofing Solutions’ Klip-Tite roofing profile was specified for the Cell C head office development in Midrand.

Global Roofing Solutions’ Klip-Tite roofing profile, rolled in 0,58mm Chromadek Charcoal, was specified for 26 200m² of roofing for the striking Cell C head office and warehouse at its Johannesburg campus in the Waterfall Business Estate in Midrand.

The project development was nominated for the 2014 Steel Awards in the Factory and Warehouse category.

According to Rashaad Jogie from Empowered Spaces Architects, who designed the Cell C warehouse, the Klip-Tite roofing profile was specified based on the product’s track-record and proven performance.

“We have used the product before and based on our experience on previous projects, we were confident to use it again,” comments Jogie.

He also points out that the unique shape of the warehouse roof required accurate bull-nosing, cranking and curving of the sheeting to create the suggested design, so the selected roof profile had to be able to accommodate these manipulations, which the Klip-Tite system did well.

“We were happy with what was delivered at the end of the day and we haven’t had any leaks or failures thus far, which makes us very pleased with the choice of roof sheeting for the Cell C project.”

Rigorous testing
According to Johan van der Westhuizen, deputy chairman at Global Roofing Solutions, the Klip-Tite product has been developed and advanced through continuous in-house testing.

“We realised that roof failure is normally caused by the sheet unclipping from the fixing clip, during high wind uplift pressure,” Van der Westhuizen notes. “We found that the weak point of sheeting is the flat (wide) pan, which is sucked upwards, causing dimensional changes and eventual failure. During the applied upwards pressure, the pan deflects upwards in the form of a bow, causing the edges of the pan to rotate inwards, which increases the width of the narrow rib and allows the narrow rib indentations to slip over the clip,” he explains.

Transverse pans stiffeners – a South African first
Methods to stiffen the pan were tested and it was decided to introduce transverse stiffeners in lieu of the traditional longitudinal pan stiffeners, in order to form structural members spanning across the width of the pan.

“A first in the South African sheeting market, these stiffeners reduced the deflection of the pan, increasing the wind uplift resistance of the sheet,” says Van der Westhuizen.

Excellent wind uplift resistance
Testing conducted on the new profile showed improved wind uplift resistance results compared to the existing Klip-Lok 700 product. However, further tests indicated that the clip then became the weak point, and it was decided to introduce additional stiffeners in order to achieve a balanced system design and even higher wind uplift resistance.

According to Van der Westhuizen, the ultimate wind uplift resistance of Klip-Tite is 1,8kPa compared to 1,6kPa for Klip-Lok 700.
In addition to the Cell C development, Klip-Tite has already been supplied for more than 400 other projects, covering over 2 000 000m² of buildings in South Africa, Botswana and Swaziland.

Global Roofing Solutions
Tel: 011 898 2900
Email: info@globalroofs.co.za
Website: www.globalroofs.co.za

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