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  1. fsolomon

    Backfill for french drain in clay soil

    GeoPaveTraffic and BigH thanks for your help. It sounds like mason sand is the correct filter media. I think it would be hard to construct vertical sand, gravel, and sand layers over the drain pipe. I would need to build vertical dividers between the different layers, and do 3 pours of material...
  2. fsolomon

    Backfill for french drain in clay soil

    I am building a french drain in a high clay soil at my house. I am planning on backfilling the trench with sand to filter the clay and using a drain sleeve filter on the perforated drainage pipe. I am able to get a ASTM D6707 drain sleeve filter with an AOS of 0.6mm. What kind of sand should I...
  3. fsolomon

    Backfill and filter for clay subsurface drain?

    I am building a subsurface drain (french drain)in a high clay soil. I am planning on backfilling the trench with sand to filter the clay and using a drain sleeve filter on the perforated drainage pipe. What sand and AOS filter should I use? I have seen C33 sand is recommended. If I use a ASTM...

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