Low to Moderate. Requires specialized equipment for excavation and compaction, knowledge of aggregate specifications, stormwater principles, and adherence to specific design depths and slopes. Professional installation is highly recommended to ensure long-term performance and code compliance.
Permeable paver systems require specific design considerations for subgrade, multiple aggregate layers, and stormwater management. Installation involves precise material selection, compaction, and grading, making it more complex than traditional impervious driveways.
Project Guidelines & Rules
Permitting and Site Planning
4 Rules
Permit Application
A building permit may be required by your local municipality prior to construction. Submit a complete application, site plan, and design drawings. (IRC R105.1)
Site Plan Requirements
Provide a detailed site plan showing property lines, existing structures, proposed driveway location, dimensions, grades, drainage patterns, and stormwater management details. (IRC R106.1)
Stormwater Management Plan
A stormwater management plan detailing infiltration rates, overflow provisions, and compliance with local stormwater ordinances must be submitted and approved by the local building department. (IRC R401.3, DuPage County Stormwater Management Ordinance)
Setbacks and Easements
Ensure proposed driveway location complies with all local zoning ordinance setbacks from property lines, principal structures, and any recorded easements. (IRC R403.1, Local Zoning Ordinance)
Subgrade Preparation & Frost Protection
4 Rules
Excavation Depth
Excavate to a depth sufficient to accommodate the entire permeable paver system, including the reservoir layer, base layers, bedding layer, and pavers, while accounting for the local frost depth. (IRC R403.1.2)
Frost Depth Compliance
The base of the aggregate reservoir layer and any associated drainage components must be designed to withstand frost heave. In DuPage County, the nominal frost depth is 42 inches below finished grade. (IRC R403.1.1, Regional Construction Standard)
Subgrade Compaction
The subgrade must be uniformly compacted to a minimum of 95% Standard Proctor Density (ASTM D698) and be stable and well-drained. Soft or unsuitable soils must be removed and replaced. (IRC R401.3, ASTM D698)
Geotextile Fabric
Install a non-woven geotextile fabric (min. 8 oz/sy) between the compacted subgrade and the initial aggregate reservoir layer to prevent migration of fines and preserve infiltration capacity. Overlap seams per manufacturer's specifications. (ASTM D4437, IRC R403.1.2)
Base and Bedding Layer Construction
4 Rules
Reservoir Layer (Sub-Base)
Install a minimum of 12-24 inches (or as per engineered design) of clean, open-graded crushed aggregate (e.g., AASHTO No. 57, No. 2, or a blend of No. 2/4) directly over the geotextile. Compact in lifts not exceeding 6-8 inches to achieve maximum density. (IRC R403.1.2, ASTM D2940)
Intermediate Base Layer (Optional)
If specified by design, install an intermediate layer of open-graded aggregate (e.g., AASHTO No. 8) typically 4-6 inches thick, compacted, on top of the reservoir layer. (IRC R403.1.2, ASTM D2940)
Bedding Layer
Install a uniform 1.5-2 inch thick layer of clean, open-graded crushed aggregate (e.g., AASHTO No. 8 or No. 9) as the bedding course, screeded to the final grade and slope. Do NOT compact prior to paver placement. (IRC R403.1.2, ASTM D2940)
Perforated Drain Pipe (if applicable)
Install a perforated underdrain pipe (e.g., 4-inch minimum, PVC SDR 35 or HDPE N-12) within the reservoir layer, sloped a minimum of 0.5% towards an approved discharge point or overflow, wrapped in geotextile sock as required by design. (IRC R401.3)
Paver Installation
4 Rules
Paver Type and Quality
Utilize permeable interlocking concrete pavers (PICP) specifically designed for permeable applications, meeting or exceeding ASTM C936 standards for strength and durability. (IRC R1004.1, ASTM C936)
Installation Pattern
Lay pavers in the specified pattern, ensuring consistent joint widths (typically 3/8-1/2 inch) as recommended by the paver manufacturer to facilitate infiltration and joint aggregate placement. (Manufacturer Specifications)
Edge Restraints
Install appropriate edge restraints (e.g., concrete curb, plastic edge restraint, or rigid border pavers) to prevent lateral movement of the pavers and aggregate base. (IRC R403.1)
Joint Filling Material
Fill paver joints with clean, open-graded aggregate (e.g., AASHTO No. 8 or No. 9) suitable for infiltration. Vibrate or compact the pavers into the bedding layer, allowing the joint material to settle, then sweep additional aggregate to fill joints completely. (ASTM D2940)
Stormwater Management and Drainage
3 Rules
Infiltration Capacity
The permeable paver system must be designed to meet or exceed the required infiltration rates specified by the DuPage County Stormwater Management Ordinance and local stormwater regulations. (IRC R401.3, DuPage County Stormwater Management Ordinance)
Overflow System
Provide an engineered overflow system (e.g., catch basin with restrictor plate, connection to storm sewer, or approved swale) to manage extreme rainfall events beyond the system's infiltration capacity, preventing off-site runoff. (IRC R401.3, DuPage County Stormwater Management Ordinance)
Runoff Prevention
Design and construct the driveway to prevent stormwater runoff from adversely affecting adjacent properties, public rights-of-way, or sensitive environmental areas. (IRC R401.3)
Electrical Considerations (If Applicable)
4 Rules
Outdoor Lighting Circuits
All outdoor lighting circuits for driveway illumination must be installed per NEC Chapter 2, specifically for branch circuits, overcurrent protection, and wiring methods. (NEC 210.70(A)(2)(b), NEC 240, NEC 300)
Ground-Fault Circuit-Interrupter (GFCI) Protection
All 125-volt, single-phase, 15- and 20-ampere receptacles installed outdoors or serving outdoor equipment must have GFCI protection. (NEC 210.8(A)(3))
Snow-Melt Systems
If an electric snow-melt system is integrated into the driveway, it must comply with NEC Article 426, 'Fixed Outdoor Electric Deicing and Snow-Melting Equipment', including dedicated circuits and protection. (NEC 426)
Underground Wiring Depth
Underground conductors and cables must be installed at depths specified in NEC 300.5, considering applicable exceptions for direct burial and raceways. (NEC 300.5)
Illinois Plumbing Code Considerations (Conditional)
2 Rules
Storm Drainage Connection
If the permeable paver system's overflow or underdrain directly connects to a public storm sewer or an existing building storm drainage system, all connections, sizing, and cleanout requirements must comply with the Illinois Plumbing Code. (Illinois Plumbing Code 890.340, 890.720, 890.1340)
Building Storm Sewer
Any connection to a building storm sewer must ensure proper sizing, venting, and protection against backflow in accordance with IPC requirements. Note: Direct connections for driveways are typically rare, and most stormwater is managed through infiltration or surface overflow to swales. (Illinois Plumbing Code 890.720)
