Cashmere is one of Christchurch's most sought-after hillside suburbs - and one of the most technically demanding areas for retaining wall work. The combination of steep terrain, Port Hills geology, and proximity to residential structures means every retaining job here requires precise engineering and an experienced crew who understands the ground.
This project involved replacing an existing retaining wall that had reached the end of its serviceable life. Before a single machine moved, the site was assessed for engineering requirements and consent compliance - the process TBT handles end-to-end so clients don't have to manage it themselves.
Why Retaining Walls Fail in Christchurch
Post-earthquake Christchurch has seen a significant number of retaining walls either fail outright or develop movement issues. Common causes include: inadequate drainage behind the wall (hydrostatic pressure builds up and pushes the structure forward), undersized timber sections, posts driven into disturbed fill rather than good bearing material, and walls built without engineering input that couldn't cope with the seismic loads of the 2010-2011 earthquakes.
TBT's approach on every replacement job starts with understanding why the original wall failed before designing the replacement. That's how you build something that lasts.
For retaining wall work across Christchurch's hill suburbs - Cashmere, Redcliffs, Sumner, Lyttelton, or anywhere on the Port Hills - call Trent on 027 858 0556.
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