This century‑old heritage building in Wellington’s CBD underwent a major seismic upgrade to meet New Zealand’s current New Building Standard. As part of the wider refurbishment, the main contractor removed the existing roof and reinstated all building services. Strengthening works focused on reinforcing the original brick chimneys with long, high‑tensile bars designed to engage only during an earthquake, improving safety while preserving the building’s historic character.

  • Customer/Owner:
    Heritage New Zealand
  • Engineer
    DIZHUR Consulting Ltd
  • Works period
    March 2023 - May 2023

Freyssinet Scope

  • Coring through existing brick chimneys up to 10 metres in length.
  • Installation of 8 × 10m long, 20mm diameter high‑tensile bars.
  • Grouting of the lower 1 metre of each bar to form a secure dead‑end anchorage.
  • Controlled stressing of each bar to 40 kN, ensuring engagement only during seismic events without compressing or damaging the old masonry.
  • Use of 316‑grade stainless steel Freyssibar for long‑term corrosion protection and durability.
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