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Old 04-17-2014, 06:59 AM
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neversatisfiedj neversatisfiedj is offline
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Permeable Pavements

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 ?
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Old 04-17-2014, 05:07 PM
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woodwardschris woodwardschris is offline
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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.
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Old 04-17-2014, 08:23 PM
mrusk mrusk is offline
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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.
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Old 04-19-2014, 03:23 PM
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woodwardschris woodwardschris is offline
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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.
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Old 04-20-2014, 10:56 PM
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jmkr02 jmkr02 is offline
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Just curious why all the fabric?
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Old 04-21-2014, 10:09 AM
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woodwardschris woodwardschris is offline
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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.
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Old 04-21-2014, 10:14 AM
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KrayzKajun KrayzKajun is online now
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As DVS would say, fabric is cheap insurance.
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Old 04-21-2014, 10:19 AM
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neversatisfiedj neversatisfiedj is offline
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What is 2b ?

Would that be #57's
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Old 04-22-2014, 10:09 PM
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jmkr02 jmkr02 is offline
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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.
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