Concrete masonry retaining walls can be designed in accordance with the following new zealand standards but it is prudent to have the design checked and inspected by a structural engineer.
How to build a concrete retaining wall nz.
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Walls higher than 1 5 m will require a building consent.
Concrete masonry retaining walls can be designed in accordance with the following new zealand standards but it is prudent to have the design checked and inspected by a.
When a building consent is required the wall must be specifically designed by a registered engineer.
In new zealand retaining walls over 1 5 meters high or walls carrying extra loading on top require a building consent from the local body council.
Should also be provided in the base of the wall.
The interlocking retaining wall block can be used to build walls up to 24 to 36 inches high depending on the size of the block.
Another concrete option is traditional grey 300 by 150 millimetre blocks but it s not a diy type job as it involves steel and filling.
Starting from 299 per metre.
Our free retaining wall cost estimator can get you an instant ballpark idea of how much it costs to have a retaining wall built in new zealand.
To obtain a building consent.
For a low retaining wall the posts must go 100 mm into the ground for every 100 mm retained above ground.
But even walls which do not require a building consent must comply with the requirements of the new zealand building.
Depending on the concrete blocks used a retaining wall made from concrete blocks could start from around 299 390.
Follow the block manufacturer s instructions for wall height limits.
For retaining walls 1 m or higher the new zealand building code may require a safety barrier at the top.
So if your wall is higher than 1 5 metres or it supports a driveway parking area or the weight of a bank or building above the wall you should consult an engineer and obtain a building consent.
Designing retaining walls when a building consent is required the wall must be specifically designed by a registered engineer.