Sika Specified for Pump House Roof
Due to the recent upgrading of the Durban Point
Precinct, near Durban Harbour, one of eThekwini
Municipality’s sewage pump stations needed to
be upgraded and relocated closer to the harbour
entrance. Once Group Five Civil Engineers had
completed construction of the pump station, Goba
Consulting Engineers specified Sika’s specialised
products to ensure that the roof area was effectively
waterproofed.
Firstly, Sikalastic-841 ST, a two-part, elastic, liquid
applied pure polyurea membrane with a very fast
reactivity and curing time was applied to the roof
substrate. This product is applicable in temperatures
ranging from -15-70°C and is 100% solid with zero
VOC. Its excellent crack-bridging properties as well as
its chemical and abrasion resistance, makes it ideal for
many waterproofing and anticorrosion applications
on water tanks, bridges, walkways, parking decks and
sewage and waste water treatment plants.
Once subcontractor, Industrial Linings Natal, had
completed the surface preparations of the roof slab,
two coats of Sikafloor-161, an economical, two-part,
epoxy resin primer, were applied. This low viscosity,
solvent-free, multi-purpose primer is suitable for
concrete substrates, cement screeds and epoxy
mortars. It is easy to use with short waiting times
and provides good penetration and excellent bond
strength.
To ensure a watertight pump house roof, the entire
roof slab (approximately 600m2) including all
detailing, was then sprayed with Sikalastic-841 ST
(1.5mm thick). The method of coating was achieved
using plural component, heated, high pressure,
proportioning spray equipment.
To complete the new structure an instant grass roof,
together with an infiltration system, was installed
over the layer of Sikalastic-841 ST. With Durban’s
humid, sub-tropical climate and over 1000mm of
annual rainfall, the waterproofing efficacy of these
Sika products will undoubtedly be proven. AD
20
africandesignmagazine.com
Sika AG, located in Baar, Switzerland, supplies
the building and construction industry as well as
manufacturing industries (automotive, bus, truck, rail,
solar and wind power plants, facades). Worldwide,
Sika has local presence in 80 countries and some 15
200 employees link customers directly to Sika and
guarantee the success of all partners. Sika generated
annual sales of CHF 5.14 billion in 2013.
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Spraying Sikalastic over Sika primer
Grass laid on top of Sikalastic