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Earthquake Assessments
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Wastewater Design

Earthquake Assessments & Strengthening Design

This service is treated as high priority. We conduct a thorough process to evaluate your building based on a comprehensive seismic assessment set by the New Zealand Society for Earthquake Engineering. These are driven by banks, purchasers and tenants (particularly government departments). We design the most economical solution for our clients strengthening work.

  1. An Initial Seismic Assessment (ISA) includes an IEP (Initial Evaluation Procedure).
  2. The IEP is generic process governed by the date of construction of the building.
  3. The earlier the construction, the worse is gets, the %NBS is likely lessened.
  4. It is probable that the IEP for the building constructed prior to 1976 will be less then 33%NBS and a written report may not be worth completing unless required proof to satisfy bankers/insurers etc.
  5. There are also issues depending on what the construction actually is and its condition.
  6. If the client wants to keep the building and prove its worth if constructed prior to 1976 or thereabouts, they will need to do a DSA (Detailed Seismic Assessment) and determine if strengthening is required.
  7. A DSA usually means we design the building again using known elements and determine those that need strengthening.
  8. To make it more complicated the government only require buildings to meet 33% of the current codes of practice of 33%NBS (New Building Standard)  to be acceptable. Banks usually require 67%NBS.


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