How to Build a Gabion Retaining Wall
Below you will find a step by step guide on how to build a gabion retaining wall.
Feel free to utilize the following information as a reference. If you have any uncertainties regarding the installation of your retaining wall, we advise reaching out to a Civil Engineer for guidance.
OVERVIEW
- Experience Required: Hard
- Tools Required: Shovel, Tamper, Protective gloves, Spray paint
- Materials Required: Gabion, Helical, Stone, Gravel, Geotextile
Step 1) Identify location
- Mark the location where you plan to construct your wall by using spray paint, rocks or alterative materials.
Step 2) Dig
- Due to regulations, the construction of retaining walls should always start at 50cm below the ground level.
- Gabion walls that are lower then 2m can however be placed directly on the ground or at a lesser depth.
- For retaining walls of this height, digging down 20cm-50cm, or until reaching a solid substrate like clay rather than the topsoil should suffice.
Step 3) 6 Degree Slope
- When retaining a significant amount of soil, ensure the hole features a 6-degree slope leaning backward.
- In the case of smaller or decorative retaining walls, it’s acceptable to maintain an upright edge instead of the 6-degree slope.
Step 4) Add Gravel
- Add a layer of gravel or basecourse measuring 20cm on top of the soil.
Step 5) Compact Gravel
- Compact the gravel by walking and stomping on it.
Optional) Concrete foundation
- Typically, low-level gabion walls don’t necessitate a foundation.
- However, in cases of significant groundwater or weak soil conditions, a foundation might become necessary.
Step 6) Geotextile
- Apply a geotextile or weed mat to the rear of the gabion baskets to prevent soil and debris accumulation behind the wall.
Step 7) Unfold the Baskets
- Unfold the gabion baskets, lifting the sides.
Step 8) Join the Cages
- Assemble the gabion baskets, following the instructions.
- Use the helicals included in the kit.
Step 9) Fill with Stone
Step 10) Close Lids
- Close your baskets, folding down the lids.
Step 11) Add Second Row
- Position the second row of baskets directly above the first row, connecting them together using helicals.
Step 12) Fill and Join
- Fill the top baskets with rocks.
- Enhance security by connecting the baskets with helicals from front to back. Adjustments may be required by cutting some of them to fit the wall’s depth.
Step 13) Finished Project
- Your 2m gabion retaining wall is finished!