Steel roofing for Mall of the North

Innovation and ongoing technical improvements in the coated steel roofing products manufactured by leading Australian multinational, BlueScope Steel, have introduced a number of benefits that support sustainability in buildings.

Designers, MDS Architecture, specified BlueScope Steel’s Clean Colorbond™ steel, in the colour Cape White and the SAFLOK 700 profile, for the 42 000m² roof of the Mall of the North in Polokwane, Limpopo. The roof of this huge retail complex was constructed by Roofing Guarantee.

Wayne Miller, general manager of BlueScope Steel’s South African operations says, “If the future of building is about reducing operating carbon emissions by minimising energy consumption, then known high-end sustainable steel products such as those supplied by BlueScope Steel will have a considerable role to play.”

The benefits of using steel include its high strength-to-weight ratio which allows for wide spans and maximum access to large internal volumes. Facilitating one-room-wide designs, it allows for easily controlled air flow/cross ventilation and natural light throughout the interior. This in turn allows for easier and less energy intensive climate control in summer and winter.

Steel has a low thermal mass which means little energy is needed to change its temperature. Steel cladding and framing is therefore ideal to use in ‘reverse mass’ and lightweight construction. Such methods of construction are most appropriate in tropical, hot, and arid climates. Lightweight materials are more responsive to temperature fluctuations so they cool more quickly at night and less energy is required for this process.

BlueScope Steel has committed considerable research and development resources to the development of its new and improved Zincalume® and Clean Colorbond™ steel sheeting. In addition, the high performance paint system on Clean Colorbond steel is formulated to provide a high level of reflection of incoming solar radiation and incorporates a number of features that minimise maintenance requirements. It offers exceptional colour retention as well as anti-chalking, anti-fungal, and dirt resistance benefits.

“Correctly applied, our product should give a lifespan up to four times longer than the standard galvanised steel or pre-painted galvanised steel variations in a similar building environment,” says Miller.

At the Mall of the North, the white roof surface minimises the fraction of inbound solar energy absorbed and maximises its reflection – resulting in a cooler roof in summer. BlueScope Steel has specially designed its super-polyester paint systems to perform in high UV environments, ensuring that the thermal performance is maintained over a long period of time. Due to the lighter weight per square metre of the aluminium/zinc coating, the heat absorption and emissivity of the upper and lower roof surfaces are minimised, limiting the amount of energy re-radiated upwards and downwards from the roof into the surrounding spaces.

BlueScope Steel products are covered locally by a manufacturer’s warranty but the company is careful to point out that warranties should be applied for prior to the start of building, to ensure that the correct product is being used for the given application and so to maximise the performance of the roofing or cladding. It is also important to ensure that the correct fasteners and flashing material are used to match the performance of the roofing or cladding sheets.

Previous story
keyboard_arrow_upGerman engineering for concrete building systems
keyboard_arrow_downGerman engineering for concrete building systems

German engineering specialist, weiler, led by proprietor Matthias Holzberger, has become a provider of turnkey production systems for prestressed concrete finished parts for specific construction projects. Since this business area has grown notably, seeing increased demand, the management and development departments have been restructured to ensure the company keeps pace with world market changes.

Next story
keyboard_arrow_upAdding glass translucence to cabinets
keyboard_arrow_downAdding glass translucence to cabinets

Glass adds a certain aspect to kitchen and bathroom designs – the room immediately 'lightens up', it appears more spacious, and glass offers clean and transparent lines.

keyboard_arrow_upWindows and doors for new schools and refurbishments
keyboard_arrow_downWindows and doors for new schools and refurbishments

ALUPLAN ARCHITECTURAL ALUMINIUM designs, manufactures and installs a comprehensive range of all aluminium and glass products for residential and commercial developments. Based in Retreat, Cape Town, the company operates mostly in the Western Cape Province. Specialising in aluminium window, doors, shopfronts, curtain walls, louvres and skylights, ALUPLAN is reputed for its custom designed manufacturing and […]

keyboard_arrow_upRoof Inspection Training bridging gaps
keyboard_arrow_downRoof Inspection Training bridging gaps

The Institute for Timber Construction South Africa (ITC-SA), the professional body for the engineered timber construction sector, will be hosting another CPD-accredited Roof Inspection Training Course from 6 to 8 November 2018 at its head office in Isando, Gauteng.

keyboard_arrow_upSmartlock Launches The Bluetooth BLE App for iOS®
keyboard_arrow_downSmartlock Launches The Bluetooth BLE App for iOS®

Smartlock announced the release of the official Smartlock BLE iOS™ app for the Bluetooth™ Low Energy smartkey, end May 2018. This free app can be searched for in the Apple App store and is only compatible with the Bluetooth Low Energy smart key. Alternatively, follow this link to download the app. The iOS application will serve […]