Waiheke & the Gulf Islands · Auckland
Geotechnical engineers for Waiheke & the Gulf Islands
Hard greywacke rock, steep coastal sites and logistics that need planning.
Waiheke sits on much older rock than mainland Auckland: greywacke that is strong when fresh but can be weathered and fractured to some depth. Getting equipment to a site often means planning ferries and access tracks, so we scope investigations to get the answer in as few visits as possible.
Ground conditions in Waiheke & the Gulf Islands
Waipapa Terrane greywackeOld, hard sandstone and argillite, often deeply weathered and fractured near the surface.
ColluviumSlope debris over rock on many hillside sections.
Coastal depositsBeach sands and soft sediments behind the bays.
What we look out for
- Steep coastal slopes and rockfall
- Variable depth to rock
- Coastal erosion
- Limited access for drilling equipment
Typical projects
- Houses on steep coastal sections
- Retaining and driveway cuts
- Wastewater and stormwater disposal assessments
Every site is different. Geology maps and council overlays are a starting point; a site-specific investigation confirms what is actually there.
Start a project
Building in Waiheke & the Gulf Islands? Send us the site address and we'll tell you what geotechnical input you need.
You get a clear, fixed scope and fee up front. Prefer to talk? Call 09 218 6915 or email info@gibbritchie.co.nz.
