Floor level surveys
Many buildings in Christchurch have been put out of level by the Canterbury earthquakes. The Department of Building and Housing provides guidance on the criteria for determining whether or not a building requires engineered foundation repairs. The criteria are largely based on how much the floor is out of level, how steeply it slopes over a 2 m distance, and whether the damage affects the utility of the building and its ability to resist further deformation.
I resurveyed a garage floor in Parklands, Christchurch that had been previously checked and found not to meet criteria for repair. The survey was inconsistent with the EQR survey and showed that the floor had a 71 mm fall, 40% greater than the minimum criterium for repair. The maximum slope was 300% greater than the minimum requirement for repair. If your floor is out of level and you have reason to doubt the quality of information you have been given, please contact me for an independent check.