LEARN MORE ABOUT
Permeable Hardscapes
Are you curious about reducing stormwater runoff on your property, but don’t want to do away with your paved areas? Do you want to create new, aesthetically pleasing additions to your landscape that are multi-functional and help the environment by reducing pollution and flooding? Permeable hardscapes could be right for you!
What are permeable hardscapes?
Permeable hardscapes are alternatives to traditional paving that allow stormwater to infiltrate into the ground rather than running off. They provide the same structural support as traditional pavement but are made of materials that water can seep through. Their size can range from residential pathways, patios, and driveways to commercial parking lots.
Photo Credit: https://water.phila.gov/
How does it work?
Similar to traditional forms of pavement, permeable pavement is constructed in layers. These layers provide structure and storage capacity for stormwater before it infiltrates into the ground. For most projects, there are generally three main layers, each with its own function.
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Layer 1: Permeable Pavement Surface Material: This is the top layer of the pavement which serves as a surface for walking or driving.
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Layer 2: Bedding Course: This layer sits directly below the pavement material and provides a stable, level surface for it to sit on. It is made up of small, uniformly sized stones.
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Layer 3: Base/Subbase Reservoir: This layer serves as both a storage reservoir for stormwater before it infiltrates into the soil and also the main support for the above layers. It is made up of larger, crushed stone.
For more detailed information on permeable pavement layers, check out the guides below.
What kinds of permeable hardscapes are there?
There are many different varieties to choose from depending on your aesthetic preferences, price range, and project type.
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Pervious Concrete and Porous Asphalt - These are versions of traditional asphalt or concrete with reduced sand and fines to allow for greater porosity and infiltration. Check out this video to see it in action!
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Dry-Laid Flagstone or Slate - This method involves placing large pieces of slate or other kinds of stone on a gravel or sand bed.
Permeable Pavers. Credit: Rochester Concrete Product
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Permeable Pavers - These are flat construction units made of concrete, stone, or fired clay bricks. Permeable pavers come in a wide variety of sizes, colors, and patterns.
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Paver Grids - These are geometric grids made of concrete/plastic designed to keep permeable materials like gravel in place. When installed correctly, this option can last a very long time.
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Crushed Stone/Gravel - One of the simplest and cheapest options, this pavement consists purely of crushed stone. A great option for residential driveways.
Dry-Laid Flagstone. Credit: Roger Miller
How can I install a permeable hardscape?
Though the installation of permeable pavement is complex and requires attention to detail, it is doable on a residential scale. Naturally, smaller scale projects like walkways will be simpler than larger scale projects like driveways.
Below we have provided links to several online guides and videos on how to install permeable pavement.
Permeable pavers are placed over a layer of stone which helps infiltrate and store water. Credit: Anne Duggan, Kevcon.inc
Can’t construct permeable hardscapes yourself? Get help.
There are several contractors in the greater Philadelphia area who provide installation of various types of permeable pavement. You can find them via the links below:
