Bad vibrations
Exclusive Homeowners claim motorway work damaging their houses
Homeowners claim rumbling machinery working on Auckland’s Southern Motorway is causing hundreds of thousands of dollars of quake-like damage to their homes.
Four Conifer Grove residents living on the Southern Motorway’s edge told the Herald it feels like an earthquake when heavy machinery working on a $268 million Southern Corridor Improvement project starts up.
They allege the vibrations are causing structural damage to their properties, sending cracks snaking through walls and swimming pools. Some have endured flooded backyards, broken fences and 18 months of disruption and frustration.
One homeowner has been locked in a battle with their insurer, which commissioned an engineering report that initially ruled the damage to her home was most likely caused by the motorway project machinery.
But the NZ Transport Agency denies the work to add new lanes to the motorway has significantly damaged private property. It says its contractors have to meet strict resource consent conditions and vibration levels are within guideline limits.
Local resident Gaylene Smith is one of those affected by the work. She calls it “two years of pure hell”.
Her Walter Strevens Drive home has an estimated $500,000 in damage she blames on the roadworks.
Yet neither her insurance company nor NZTA’s contractor are willing to pay for repairs, arguing the damage dates from before the start of the motorway extension.
“[I’ve had] lots of sleepless nights,” she said. “This [home] is 100 per cent all we own . . . we could walk away with nothing and be left homeless.”
She believes dozens of Conifer Grove residents have properties similarly damaged by the roadworks, and many had turned out to street meetings to complain. The Southern Corridor construction project cuts through Conifer Grove for about 1km as it follows the Southern Motorway.
It is designed to ease traffic congestion by adding motorway lanes between Manukau and Papakura as well as a shared pedestrian and cycle path.
NZTA senior manager project delivery, Chris Hunt, said that while the construction passed through a “narrow, live motorway corridor with neighbouring properties close by”, the agency and its contractors worked hard to be a good neighbour.
Contractors had to meet strict “resource consent” conditions and carry out regular monitoring, such as by measuring vibration levels.
The agency was also “investigating [whether vibration from the construction work has damaged] properties in Conifer Grove”, Hunt said.
So far all reports had concluded vibration levels in the suburb were “comfortably below the guideline values”, he said.
The contractor could not be reached yesterday but NZTA told the
Herald questions for the firm should also go to the roading agency.
Auckland Council said it was not aware of any complaints relating to the motorway project but it would need to investigate further this week.
Smith said she first noticed cracks in the walls of her two-storey timber home and its fibre cement cladding after the roadworks started up.
Initially her insurance company agreed to cover the claim after she
lodged it in February 2017. However, a year later the company reversed its decision, she said, claiming the policy did not cover vibration damage.
In between, the company received an estimated $500,000 repair bill for Smith’s home, while its engineer’s report found cracks in the walls were most likely caused by machinery operating on the motorway project.
A second insurance report was inconclusive.
Smith took the company to the insurance ombudsman but lost her bid to force it to honour the claim.
Attempts by the Herald to reach the insurance company yesterday were unsuccessful.
Fellow Conifer Grove residents Mark Heaslip and Liz Lloyd, who live in Kamulla Court and Corolu Place, said they faced similar hurdles.
Neither the contractor nor NZTA had accepted responsibility for cracks in Heaslip’s spa pool or the walls of Lloyd’s home, which both residents blame on the roadworks.
Brylee Drive resident Dianne Walker said her insurance company was still investigating whether cracks in her home were caused by the motorway construction.
She had also battled the contractor and NZTA on a range of other issues. Last winter, flood waters swept into her backyard, which she said was caused by the roadworks. Her back fence was also knocked down by work crews, allowing a pet dog to escape on to the motorway, she said.
She had managed to get partial compensation for the flooding and fencing.
University of Waikato geotechnical engineering lecturer Dr Ali Shokri said he could not conclusively say what caused the damage without a site visit.
Vibration was a possible, but unlikely cause, he said. Another possible explanation was changing water levels caused by contractors draining or increasing water depending on the soil in the area.