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Once the sleepers have been installed, place drainage aggregate (20mm recommended) at the base of the retaining wall as high as the top of the bottom sleeper. Then install the geo fabric material in a U shape, running down the back of the retaining wall and looping up the 300mm cut out behind the retaining wall, leaving a bit of excess cloth free to loop over the top of the 300mm gap. Inside of the geo fabric roll place the agi pipe at the bottom. Then fill with 20mm drainage aggregate with the geo fabric and cover that top 200mm behind the retaining wall with soil.
NOTE: Drainage Point #
Ensure the drainage point of the water is away from behind the wall.
Remember to consider where the water will be draining to after you have funnelled it away from the back of the wall, if it pools somewhere in front of the wall and stays there or runs into another area and causes problems there that will need to be managed seperately.
We recommend using 65mm diameter wide agi drainage pipe for walls up to 1m in height and the 100mm diameter wide agi drainage pipe for walls 1m in height and above, unless the area behind the retaining wall has a substantial amount of water drain towards it, then using a 100mm diameter wide agi drainage pipe would be better suited for a wall under 1m in height.
We recommend using the socked agi pipe for all retaining walls, however if you are installing the drainage agi pipe inside of the geo fabric at the base of the drainage aggregate, you can use the unsocked agi pipe.
If you have any additional queries unanswered by this installation guide, feel free to contact the HYBUILT team.
