Installation
Most plumbers, drainlayers and installers in South Australia are familiar with the Ri-Industries septic tanks and their installation. Contact us for a list of installers in your area.
Regulations covering installation and design of your septic system are set down by the Health Department. Your Local Council Health Inspector will give you information relevant to your area.
Please also speak to our sales team who are extremely knowledgeable about septic installation. For example, horizontal septic tanks should not be placed in a trafficable area. If a trafficable septic tank is required please speak to us about our vertical septic tanks. We also recommend that all septic tanks are placed on an even bed of fine gravel or clean fill and back-filled with the same.
Please Note: Ri-Industries advises that all underground tanks are to be filled at least 50% – 70% with water in all chambers to stop flotation, depending on site conditions
Excavation, Base Preparation and Backfill
- Over excavate by 300mm all around to all sides for backfill.
- Base preparation shall consist of excavating flat uniform surface to a depth of 100mm below the required level and backfilling with 10-12mm gravel for bedding of the tank.
- Where natural ground is extremely soft, over excavate by 200mm, compact 100mm of 50-75mm ballast into the surface and backfill to the required level with 10-12mm gravel.
- All horizontal tanks engineered to a maximum depth of 900mm
- Complete backfilling with approved granular material such as sand compacted in 150mm layers to 90% maximum dry density in accordance with AS3798.
- After installation of the tank, backfilling shall be raised evenly around the tank with a maximum backfill height differential of 400mm at any time.