Glass and aluminium curtain walling company Grinaker-LTA Façades has been awarded a R10-million contract for the curtain walling and shopfronts at the Sandton Eye, also known as 1 Station Place.
Grinaker-LTA Façades is a division of Grinaker-LTA’s Building business unit and part of the JSE-listed Aveng group.
Its current projects include the Inner Circle development, in Morningside’s Rivonia road, and 15 Alice Lane Towers, in Sandton.
Grinaker-LTA Façades GM Colin Gardner says that a R33-million subcontract at the Inner Circle offices was completed ahead of schedule.
The Inner Circle office building’s shimmering façade comprises a combination of arctic blue and marine blue glass in a powder-coated unitised aluminium support framework.
The division has supplied 1 600 glazed units, each comprising four pieces of glass. The curtain wall is a total 10 500 m2 in size, and is designed to maximise the natural lighting in the office areas, while reducing solar heat build-up in the ten- storey office block, resulting in lower lighting and air-conditioning energy demands.
“The design and architectural team have put together a well-thought-out glass structure aimed at achieving optimal light and thermal efficiency,” explains Gardner.
In addition to its energy efficient qualities, the curtain wall for the new office block also matches the adjacent Inner Circle building.
The curtain wall on 15 Alice Lane Towers will be a testing undertaking, Gardner notes, with project challenges including carefully negotiating the vertically curved curtain wall that protrudes 5 m past the outside of the structure and the extension of the curtain wall above the roof level.
The gable ends will be a combination of composite panel units with recessed diagonal strip windows. The building’s main glass façade consists of a variety of patterned glass elements, Gardner explains.
“The main challenge involves the accuracy of the workmanship and fitting the right glass into the right panel is paramount,” he stresses.
The company recently completed cladding for several high-profile developments around South Africa. These include the Civitas building, in Pretoria’s central business district, which is the new headquarters of the Department of Health, as well as the Coega Development Corporation’s offices, at the Coega industrial development zone, in Port Elizabeth.
Grinaker-LTA Façades’ work at the 36-year-old Civitas building entailed the installation of a new 15 500-m2 glass curtain wall designed to give the old skyscraper a new look, and make it energy efficient.
A similar modern glass façade on the new nine-storey office block constructed adjacent to the original Civitas building was installed by the company so that the new building matched the existing one and created additional tenant space for the Department of Health.
A total of 8 800 m2 of glass curtain wall was fitted.
The glass curtain walls were also designed to improve the natural lighting in the office areas while simultaneously reducing solar heat build-up within the building, resulting in decreased lighting and air-conditioning energy demand.
With South Africa’s building regulations under review with the aim of reducing energy demand from industry by 15% in 2015, the new Civitas building’s energy efficient features are particularly noteworthy. The energy efficient glass façades have resulted in the building’s surpassing the target for reducing overall energy consumption by 24% for air conditioning.