Permeable Interlocking Concrete Pavement Systems Design and Construction

Sponsored by Belgard Commercial

Learning Objectives:

  1. Explain how permeable interlocking concrete pavement can provide stormwater management benefits to land development projects.
  2. Describe proper specifications for construction of PICP systems.
  3. Explore the industry recommendations for maintenance of PICP systems.
  4. Identify industry resources for specifying and designing PICP systems.


AAA 1 Structured Learning Hour
This course can be self-reported to the AANB, as per their CE Guidelines
AAPEI 1 Structured Learning Hour
MAA 1 Structured Learning Hour
This course can be self-reported to the NLAA.
This course can be self-reported to the NSAA
NWTAA 1 Structured Learning Hour
OAA 1 Learning Hour
SAA 1 Hour of Core Learning
This course can be self-reported to the AIBC, as per their CE Guidelines.
This course is approved as a Structured Course
This course can be self-reported to the AANB, as per their CE Guidelines
Approved for structured learning
Approved for Core Learning
This course can be self-reported to the NLAA.
Course may qualify for Learning Hours with NWTAA
Course eligible for OAA Learning Hours
This course is approved as a core course
This course can be self-reported for Learning Units to the Architectural Institute of British Columbia
This test is no longer available for credit

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Land development in urban areas across America have resulted in excessive amounts of impervious pavements that cause stormwater problems. In urban areas, impervious surface area can cover a significant amount of drainage basins. The obvious solution to mitigating impervious surfaces is to create pervious surfaces. Society needs pavement surfaces, but in many construction and redevelopment projects, designers and government officials should consider permeable pavements as part of a green infrastructure strategy. Permeable pavements are considered green infrastructure because the permeable pavement surfaces can mimic the natural stormwater infiltration of undeveloped land surfaces.

Stormwater professionals that want to utilize permeable pavement have a selection of different materials and product options. The most common and well-established permeable pavement systems include: pervious asphalt, porous concrete, and permeable interlocking concrete pavement (PICP). However, ttere are also innovative alternative materials that can function as a permeable pavement.

Permeable interlocking concrete pavement (PICP) systems have enlarged spacer bars that create surface openings that are filled with highly permeable filter aggregate. Typically, PICP has between 5–15 percent surface openings that are often between ¼ inch and ½ inch wide and are always filled with open-graded washed angular aggregate stone. The size of the infill stone is based on the joint width and is either specified ASTM No. 8, 89, or 9 stone. Even though the surface only has 5–15 percent openings, it is 100 percent pervious because the flow rate is so high between the joints.

Brick road in a suburb area

Photo courtesy of Belgard Commercial


Belgard Commercial Belgard Commercial is part of the Oldcastle Architectural Group, the largest concrete products manufacturer in North America. With over 180 locations and a company culture characterized by a commitment to customer satisfaction, Belgard is committed to partnering with the design community by helping you find solutions to meet, or even exceed, your clients’ needs and expectations. Belgard branded products such as retaining walls, paving systems and specialty products provide a wide range of sizes, shapes, textures and colors for every project. Oldcastle adheres to a level of service and consistency that no other supplier can match. Our combination of local market presence and national capabilities allows us to meet and exceed the demanding needs of an ever-changing industry.


Originally published in March 2018