Geotechnical engineers for Rodney & Warkworth
Some of the most slip-prone ground in the region, and a large share of our recent work.
Rodney is a large share of our recent work, from Leigh and Matakana to Kaukapakapa and Kumeū. Much of the area around Warkworth, Puhoi and Kaukapakapa is underlain by the Northland Allochthon, a jumble of sheared mudstones that weathers to weak, slippery clay. Slopes here can be stable for decades and then move after one wet season.
For houses and lifestyle subdivisions in Rodney we spend more time on geomorphology, reading the landforms for signs of old movement, than anywhere else in Auckland. It is often the most useful part of the investigation.
Ground conditions in Rodney & Warkworth
What we look out for
- Deep-seated landslides and slow-moving slopes
- Slips triggered by heavy rain
- Soft alluvium on valley floors
- Effluent and stormwater disposal on clay soils
Typical projects
- Rural houses and accessory buildings
- Slip assessments and remediation after storms
- Lifestyle-block subdivisions
- Driveway and access cut slopes
Every site is different. Geology maps and council overlays are a starting point; a site-specific investigation confirms what is actually there.
Building in Rodney & Warkworth? 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.
