Permeable Pavers &Porous Paving

Permeable pavers allow stormwater to pass through the surface and into underlying aggregate layers where it infiltrates into the soil or is stored temporarily before slowly releasing. Water enters through joints between pavers (permeable interlocking), through the paver material itself (porous concrete/asphalt), or through openings in the paver (grass/gravel pavers). The aggregate base acts as a reservoir that filters pollutants and allows controlled infiltration.

Main types include: Permeable Interlocking Concrete Pavers (PICP) with enlarged joints filled with aggregate. Porous concrete and porous asphalt with open void structure. Grass pavers (grid systems that allow turf growth). Gravel pavers (grids that contain loose aggregate). Permeable clay brick pavers. Each type suits different aesthetic and functional requirements—from parking lots to residential driveways to fire lanes.

Yes, properly designed permeable paver systems can handle everything from passenger vehicles to heavy trucks and even fire apparatus. Load capacity depends on the paver thickness, pattern, and base design. Interlocking concrete pavers are available in thicknesses from 60mm (residential) to 120mm+ (heavy industrial). The aggregate base must be designed for expected loads in addition to storage requirements.

Permeable pavers require different maintenance than traditional paving. Vacuum sweeping 2-4 times annually removes surface debris that can clog joints. Avoid sand or salt application that clogs pores—use approved deicers. Promptly repair any damaged or settled pavers. Periodically test infiltration rates and remediate if needed. Prevent sediment-laden runoff from adjacent areas. Overall maintenance costs are comparable to traditional paving when properly planned.

They can, but cold-climate performance depends on the product, aggregate base, drainage outlet, subgrade, infill, snow-removal method, and maintenance plan. NDS states that its EZ Roll gravel pavers may be plowed when installed and maintained as directed. Confirm local frost-depth, deicer, and maintenance requirements rather than assuming every permeable system performs the same way.

There is no responsible single rate for every permeable-paver site. Surface openings, infill, base aggregate, subgrade permeability, compaction, sediment loading, and maintenance all control performance. Test the soil, size the base and overflow for the design storm, and add an underdrain where the subsoil cannot accept water fast enough. Re-test the installed surface as part of maintenance.

Yes, but the design must account for low infiltration rates. Options include: oversized aggregate base to provide adequate storage volume, underdrains that slowly release stored water to the storm system, overflow connections to handle excess volume. With these adaptations, permeable pavers provide water quality benefits and reduced peak runoff even when full infiltration isn't possible.

Compare complete installed systems, not just the surface material. Pricing varies with excavation, aggregate base depth, geotextile or underdrain needs, infill, edge restraint, traffic loading, labor, and maintenance access. A permeable system may change the size of other stormwater controls, but that credit is jurisdiction- and site-specific. Obtain alternate designs and local installed pricing before choosing.

Grass pavers are polymer or concrete grid systems that provide structural support while allowing grass to grow through openings. The exact polymer varies by system: for example, current NDS documentation identifies polypropylene for Tufftrack and HDPE for EZ Roll. Common applications include overflow parking, fire lanes, emergency access roads, and trail reinforcement.

Permeable pavers are a recognized Best Management Practice (BMP) that helps meet stormwater regulations. They address multiple requirements: volume reduction through infiltration, peak flow reduction through storage, water quality improvement through filtration, and groundwater recharge. Many jurisdictions give permeable paving credit toward Low Impact Development (LID) requirements, stormwater utility fees, and green building certifications like LEED.