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Precision control

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Geyser's main contractor was Mainzeal

Precision control


Construction of a Green Star-rated building can inspire passion in all those involved – including the lead contractor.

Dealing with exacting parameters and specialist disciplines, as well as having a familiarity with the components that go into making a build sustainable were all part of the job when Mainzeal Property and Construction was asked to lead the construction of the Geyser complex in Parnell, Auckland.

Auckland regional manager for Mainzeal John Hemi says that build logistics on the constrained site – with narrow streets and heavy pedestrian and traffic flows – made for a challenging construction.

"There was another side to Geyser – the drive for a green, energy-efficient and healthy building. This affected the approach we took and fed through to our own on-site activities. For instance, as well as minimising waste, we voluntarily tracked the embodied energy associated with the construction."

In addition, the Mainzeal team put their heads together to find a better solution for the proposed top-down build. This improved the environment for those undertaking the excavation works for the basement car park and introduction of the large underground automated carpark stacker machine.


"Instead, we excavated from the first basement level all the way down to the bottom of the lowest level in one operation, thus avoiding cramped, dangerous working conditions," says Hemi.

Mainzeal also used an international risk-management guideline ISO 31000 to set the framework for healthy operation during the basement construction.

The head contractor played its part in making sure materials were Green-Star compliant.

The selection of concrete mix, construction style and placement approach were all undertaken with sustainability in mind – 2500 tonnes of recycled concrete aggregate were mixed for the project and 550 tonnes of cement were replaced by recycled binder. A Green Star Shotcrete mix was jointly developed for the job by Mainzeal, supplier Holcim and subcontractor Shotcrete Services.

For further details, contact Mainzeal Property and Construction, phone (09) 375 2100. Email: .

First published date: 19 November 2012

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