Modes of failure vary when looking at repairing a retaining wall. Depending on the type of retaining wall, the approach to repair is best decided by either an experinced geotechnical engineer or an experienced retaining wall specialist.

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The beginning of failure. This retaining wall, although small, is not capable of retaining the soil behind. This is made worse by having to also hold up the fence above.

As most retaining walls in Auckland are made from timber, they are typically a cantilever system which utilises vertically-placed posts or sleepers to hold the retained embankment. There are mainly three types of failure with timber sleeper retaining walls; rotation, corrosion (rot and termite damage) and tree roots.

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Rotation, in this case due to tree roots, also affects concrete block retaining walls.

Following is a before and after repair job that we carried out. The original retainer, although built with treated pine, was termite ridden and rotten from moisture/ dampness. This was removed and replaced with a smooth, off form grey concrete sleeper wall which uses galvanised steel beams.

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Before…
repair-timber-retaining-walls-auckland
…After

The replacement retained earth sleeper wall also featured our heavy duty fence brackets to allow for rapid fence installation.

Contact retained earth for more details.