Soil shrinkage becoming a focus
National requirements for the assessment of ground conditions for shrink/swell were over-hauled in 2019 and made more stringent. This has been found to be of particular concern in the Whangarei District. The amount of lab testing and consideration of this issue is becoming a larger part of geotechnical investigations for building.
This photo shows a recent investigation; lab tests showed it to have a very high shrinkage potential.
