For retaining walls 1 m or higher the new zealand building code may require a safety barrier at the top.
How to build a concrete retaining wall nz.
Follow the block manufacturer s instructions for wall height limits.
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.
Depending on the concrete blocks used a retaining wall made from concrete blocks could start from around 299 390.
To obtain a building consent.
Cost for a concrete retaining wall.
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.
Starting from 299 per metre.
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.
If you looking for any tools to complete all of your timber projects and what to know the best timber for decking timber fencing.
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.
For any other diy advice woodmart your one stop wood choice.
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.
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.
But even walls which do not require a building consent must comply with the requirements of the new zealand building.
For a low retaining wall the posts must go 100 mm into the ground for every 100 mm retained above ground.
Walls higher than 1 5 m will require a building consent.