Architect and Builder Magazine South Africa November/December 2013 | Page 50

BlueScope at the
Blue Route Mall Upgrade
A pre-painted AZ200 roofing material, manufactured by BlueScope Steel,
was recently used in a major upgrade of the Blue Route Mall

A

mazing White, an exclusive colour in the Clean
COLORBOND™ ULTRA steel range, was formed into
Ziptech 420 by Hulamin for the main roof, covering
30,000m2. The product was also formed into Ziptech XT cladding
and used as Cladtech F350 panels for eaves and soffits.
According to Lance Wilson of Hulamin, Clean COLORBOND™
ULTRA steel was specified for its “cost effective corrosion
resistance, the durability of the substrate and superior coating”.
The roof was designed and roofing material specified given
the windy and often stormy wet conditions that rake the South
Peninsula, with the following criteria in mind:
• Water carrying capacity. The roof had to offer sufficient
resistance to ingress of water - due to profile height and standing
seam lap design
•
Ability to reverse smooth curve – effectively a reverse
concave design,
• Ability to meet these criteria via single long reverse smooth
curved sheets
•
Negative wind resistance due to seaming of upstands and
not clipping.
• Aesthetic features
A white pre-painted roofing material was chosen for energy
conservation reasons. “The white colour chosen by the designers
of the mall upgrade provides an ideal cool roof. The unique paint
system used on all colours of the entire Clean COLOLRBOND ™
steel range incorporates various essential sustainability features

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such as high reflection of incoming solar radiation (SRI), exceptional
colour retention, anti-chalking and dirt resistance”, says Wayne
Miller, the BlueScope Steel head of operations in Southern Africa.
To enhance a project’s rating under the Green Star system
or simply in promoting sustainable building practice during
refits, GBCSA member company, BlueScope Steel recommends
that roofing systems should optimise levels of performance
and lifespan, in addition to minimising their carbon footprint.
BlueScope Steel defines this sustainability as follows:
• Long service life & ultimately recyclable
•
Dematerialisation of the substrate and the coating – lower
coating mass - but giving better performance
• Reflect maximum amount of incoming solar radiation via
advanced infrared coating system
(Reference: ‘Steel in Sustainable Building’ - SA Roofing
Magazine Jul/Aug 2011)
Under harsh climatic conditions, especially within the sensitive
5km coastal zone, Miller advises “Use only premium grades of
alloy-coated steel such as ZINCALUME® and pre-painted steel
such as Clean COLORBOND™ to gain much longer service life…If
you are building in severe industrial environments where there are
aggressive fumes or particulate fallout within a 200m radius of if
the location is within 100 - 400m of the sea, we would advise using
our Clean COLORBOND™ ULTRA. This has an AZ200 coating – in
this case, coated to a mass of 200 g/m2 over the steel substrate.
www.bluescopesteel.co.za

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