Janis
Hi Chris
Thank you for your answers. We are rebuilding with a TC3 Ribraft foundation consisting of a bottom slab and a jack slab on the top. Our original build was only 3 months old at the time of the 2010 earthquake and after the 2011 earthquake became up to 100mm out of level. We fought for 4 years to become a rebuild which we have organised ourselves with a building company. This is our reason for checking for what is considered normal for new construction and we also intend to put a zip level through the house when the rebuild is a little further on (windows and doors have just gone in at present).
We went for TC3 ribraft so we would be able to relevel the foundation if necessary if there was a problem with further earthquakes.