Paver Systems PERMEABLE PAVERS FAQS

  • What is the role of the Permeable Pavers?

    Permeable Pavers are designed with void spaces or larger joints that allow water to pass through into the base and into the soil (known as exfiltration) or into storm water pipes.

  • Can Permeable Pavers be used on driveways, walkways or roads?

    Yes. Driveways, walkways and low speed roads can easily be designed to use Permeable Pavers provided they are not on steep slopes typically greater than 5%.

  • Is the base material important?

    The proper material is a crushed angular gravel mix with NO fines. The base typically consists of two to three different layers. The first base layer and consists of 3/4 inch crushed angular rock that will have void spaces between 25-40%. The sub base layer used in heavier loading situations typically consists of 1-2 inch size crushed angular rock.

  • What type of material is used for the base?

    The proper material is a crushed angular gravel mix with NO fines. The base typically consists of two to three different layers. The first base layer and consists of 3/4 inch crushed angular rock that will have void spaces between 25-40%. The sub base layer used in heavier loading situations typically consists of 1-2 inch size crushed angular rock.

  • What is the Geotextile and is it necessary?

    The Geotextile is a heavy fabric that functions much like a coffee filter. Water is allowed to pass through without allowing the small particles of soil from flowing out or into the base rock. It is necessary in all Permeable Pavements with full or partial exfiltration. In a no exfiltration application the Geotextile is a heavy liner material used in pond construction.

  • Is the bedding sand used in Permeable Pavements?

    No. The use of sand in Permeable applications is not recommended. A 4 inch thick layer of 1/2 inch size crushed angular stone is used for the bedding of the Permeable Pavers. This stone will allow height tolerances to be compacted out of the pavers and will begin the interlock process from the bottom of the joints.

  • What material is used in the voids or joints?

    Again crushed angular stone is used. Depending on the Permeable Paver type a 1/4 inch up to a 3/8 inch size rock is used. SAND should never be used in the voids or joints.

  • Is an edge restraint important?

    Yes. Without a proper edge restraint the Permeable Pavers could shift apart losing the interlock and allow for rutting and could allow the stones to displace.

  • Is maintenance required for Permeable Pavers?

    Yes. As with any pavement there is maintenance. It is recommended the pavers be cleaned at least once a year with a sweeper and vacuum to prevent silts from crusting in the voids and joints.