The notice requires that the building owner must either strengthen or demolish the building or part of the building that causes it to be earthquake-prone. The building can still be used and occupied for its current lawful use prior to the notice expiring. The notice must also be displayed on the building in a prominent place, on or adjacent to the building.
There are four types of notices, with the different borders indicating the type of earthquake-prone building. Notices with an orange and black striped border are for buildings with an earthquake rating of 0% to less than 20% NBS, or where no engineering assessment has been provided and the earthquake rating has not been determined.
What do the engineers look at?
Hayley: In the first instance an engineer will be interested in taking a close look at the original plans of the building as well as any drawings that document any previous structural upgrades. They will consider the building age, soil conditions, construction type, number of storeys and if a building is structurally connected to the neighbouring building. They will also undertake an external and internal inspection of the building to ensure the building as built, matches the existing drawings.
An engineer could then undertake a very broad basic assessment, which is called an Initial Evaluation Assessment. This preliminary assessment is carried out as a screening tool to determine a rough indication of the seismic performance of the building.
A Detailed Seismic Assessment (DSA) could be a next stage assessment and this is a more involved evaluation which includes some calculation and/or computer analysis providing a more accurate indication of the seismic performance of a building.