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Permeable Pavements

Discussion in 'Hardscaping' started by neversatisfiedj, Apr 17, 2014.

  1. neversatisfiedj

    neversatisfiedj LawnSite Bronze Member
    Posts: 1,028

    Got a call for a permeable pavement.
    I dont know much about the construction techniques
    How much base and what type base material for a standard patio ?
    What type of edging besides curb ?
     
  2. woodwardschris

    woodwardschris LawnSite Member
    Posts: 42

    Josh:

    We just finished a 1,000 SF project using EP Henry Eco Pavers. The area we put this in is pretty wet, so we put the following:

    Geotextile fabric
    24+ inches ballast (3-4 clean stone)
    Geotextile fabric again
    6+ inches 2b clean (3/4" clean stone)
    Geotextile fabric again...again
    2 inches 1b (3/8 clean stone)

    Pavers sit on top of 3/8 stone and same stone fills joints...no poly sand as drainage is the reason to use perm pavers and poly sand would prevent drainage.

    I will forward pictures later.


    A curb would have been the best edge, but we used a product from EP Henry called perm edge...basically an edge restraint with four feet of a grid material. The grid part of the edge is placed down with the pavers sitting on top of the grid. The weight of the pavers on the grid will help keep the edge from sinking.
     
  3. mrusk

    mrusk LawnSite Gold Member
    Posts: 3,260

    When you say geotexile fabric do you mean woven ground stabilization fabric or regular filter fabric? I always felt what flowed a lot less through woven.
     
  4. woodwardschris

    woodwardschris LawnSite Member
    Posts: 42

    I think in the case of 2b clean as a base material, I would prefer the woven geotextile fabric. With that much ballast and 2b, I am not looking for fast drainage.

    I don't trust the light weight landscape fabric over a long period of time.
     
  5. jmkr02

    jmkr02 LawnSite Senior Member
    Posts: 262

    Just curious why all the fabric?
    Posted via Mobile Device
     
  6. woodwardschris

    woodwardschris LawnSite Member
    Posts: 42

    Ballast has bigger voids than 2b. Fabric prevents migration of 2b into ballast voids.

    2b has bigger voids than 1b. Fabric keeps 1b from migrating into 2b.
     
  7. KrayzKajun

    KrayzKajun LawnSite Fanatic
    Posts: 10,742

    As DVS would say, fabric is cheap insurance.
    Posted via Mobile Device
     
  8. neversatisfiedj

    neversatisfiedj LawnSite Bronze Member
    Posts: 1,028

    What is 2b ?

    Would that be #57's
     
  9. jmkr02

    jmkr02 LawnSite Senior Member
    Posts: 262

    Does the manufacturer have a spec? Icpi filter fabric non woven geotech is optional on as a sub base seperator on permeables. The stone layers choke each other out. On some jobs we did run filter fabric on the 3/4 clean and run bedding sand for non permeable pavers. Adding fabric changes the water infiltration rates.
    Posted via Mobile Device
     

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