The UNI Eco-Stone Family of Permeable Pavers

Eco-Optiloc Fire StationUNI-GROUP U.S.A. was the first to introduce permeable interlocking concrete pavers (PICP) to North America in 1989 with our revolutionary UNI Eco-Stone® paver. As leaders in the industry, we recognized the possibilities and environmental benefits of being able to infiltrate water through the pavement surface into the ground below to help manage stormwater on site. Since, then we've added several styles of permeable pavers to meet the increasing demand for residential, commercial, municipal, institutional, and even industrial pavements - Eco-Priora,® Eco-Optiloc® and Ecoloc®.


With the advent of the Environmental Protection Agency's (EPA) mandate to control stormwater runoff through it's National Pollutant Discharge Elimination System (NPDES) in the early 90's, the path was paved for the growth of permeable pavements. Since then, best management practices, stormwater management, low impact development, and green infrastructure have become the standards for site design. Infiltration practices in particular have emerged as a major focus of federal, state, and municipal agencies and the Eco-Stone® Family of Permeable Pavers utilize infiltration to control stormwater runoff.


As with our traditional interlocking concrete pavers UNI Permeable Pavers, are manufactured to the highest quality standards with minimum 8000 psi and maximum water absorption of 5%. They meet or exceed ASTM C-936 and freeze-thaw testing per section 8 of ASTM C-67. UNI Pavers have a 50-year design life based on proven field performance worldwide.


Please visit our Project Gallery for UNI Permeable Paver projects from across the nation, as well as our Design/Installation pages for an extensive array of design manuals, technical data, specifications, research, case studies, articles, cross-sections, literature, software, and videos. Our Resources pages offer detailed information on federal, state, and municipal design guidance and incentive programs, rating systems such as LEED®, Greenroads®, Envision™, and Sustainable Sites™, green infrastructure and low impact development calculators, and much more.



UNI Project Slide Show - This slide show features a number of UNI permeable paver projects from around the nation. It is in large format 16:9 suitable for larger monitor viewing. It is a large size file, so it may take a few minutes to download. Please visit our Permeable Project Gallery page as well.


Want to ask a technical question or talk to us directly? We answer all inquiries promptly. E-mail us at or call us at 1-800-872-1864.


UNI Permeable PaversBenefits and Features of UNI Permeable Pavers

  • Sustainable, durable, cost effective and attractive pavement
  • Provides a 100% pervious surface through aggregate-filled drainage openings and joints
  • Can be designed to accommodate a variety of stormwater management objectives - federal, state and municipal - provides compliance with NPDES regulations
  • Saves money by combining parking and detention, allowing better land-use planning and more efficient use of property for greater economic value
  • Mitigates runoff volumes and peak flows, reduces pollutants and Total Maximum Daily Loads, and addresses water quality/quantity
  • Minimizes impacts and stress on existing combined storm sewer systems through reduced peak discharges
  • May decrease projects cost by reducing or eliminating drainage and retention/detention systems
  • May reduce cost of compliance with stormwater regulatory requirements and lower utility fees
  • LEED® points for Sustainable Sites, Water Efficiency, Materials and Resources and/or Innovative Designs
  • Contributes to Green Globes® points and supports green infrastructure initiatives and programs
  • Meets U.S. Environmental Protection Agency (EPA) stormwater performance criteria as a structural best management practice (BMP)
  • Maximizes groundwater recharge and/or storage
  • May be designed with underground storage and rainwater harvesting systems
  • May reduce heat island effect and thermal loading on surround surface waters
  • May be used on sloped sites with proper engineering design
  • Patented shapes and interlocking spacers offer superior durability under traffic loads, withstand turning movements without surface degradation/unraveling
  • Suitable for use in any climate, may be snow-plowed and can be trafficked immediately after installation
  • Reduces use of deicing material due to rapid ice melt and surface infiltration
  • Offers easy access to underground utilities and provides seamless repairs
  • Maintained with street sweeping/vacuuming
  • Meets ADA requirements for a firm, stable, and slip-resistant pavement surface
  • Can be mechanically or manually installed


  • Office, multi-family, retail and municipal plazas, courtyards and other public areas
  • Parking lots, entryways, sidewalks, patios and driveways
  • Low-speed roadways, streetscapes and street parking bays
  • Depots and storage areas (non-hazardous materials)

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The design, engineering and installation information provided on this website is intended to provide guidance and recommendations for design professionals. Design and construction will vary with local regulations, specifications, environmental conditions, materials and established construction methods for an area. It is not intended to replace the judgement or expertise of professionals engineers, architects or landscape architects, who should be consulted in the design and construction of traditional or permeable interlocking concrete pavements.


Tags: Permeable pavers, pervious pavement, porous pavement, sustainability, stormwater management, green infrastructure, PICP, parking lots, streetscapes, UNI Eco-Stone, Eco-Priora, Eco-Optiloc, Ecoloc, UNI permeable pavers


The original UNI Eco-Stone® paver has been one of the most popular permeable pavers in North America since it was first introduced in 1989. The classic shape provides structural interlock to provide a strong, durable pavement surface under vehicular traffic, yet provides an attractive design for residential, commercial, municipal and institutional pavement applications. Eco-Stone can be installed in a number of patterns, including herringbone, parquet and running bond.



Thickness: 3 1/8 inches (80mm)
Length: Approx. 9 inches (230mm)
Width: 4 1/2 inches (112.5mm)
Percentage of void area per sq ft:: 12.18%

Approximately 3.5 pavers per square foot

Available nationwide


Architectural Product Sheet


Eco-Priora® has become the permeable paver of choice among design professionals. This paver can be produced in a variety of square and rectangle sizes by UNI Manufacturers.

It features interlocking spacers that offer advanced interlocking capability under traffic loads compared to other square and rectangular permeable pavement systems on the market. The flat surface and minimal chamfers of Eco-Priora make it well-suited to pedestrian areas and for ADA handicap-accessible pavements where a smoother surface is desired.



Thickness: 3 1/8 inches (80mm)
Length & Width: Varies depending on manufacturer, typically
4" x 8", 8" x 8", 5" x 10" or 10" x 10"

Number of pavers per square foot will vary according to size of unit

Percentage of void area will vary depending on manufacturer
Please note sizes may vary - contact your manufacturer for availability


Architectural Product Sheet


Eco-Optiloc® is designed to handle heavier vehicular traffic loads and was designed for fast mechanical installation.. Like the Ecoloc® unit, it is L-shaped for superior stability under high point loading. It features interlocking spacers that add stability under directional traffic, and there is a traditional version of the paver, UNI-Optiloc®, that can be used in combination.



Thickness: 3 1/8 inches (80mm)
Unit is an L shape with two equal sides and two false joints
Outside Length: Approx. 10 1/4 inches (260mm)
Inside Length: Approx. 5 inches (125mm)
Width: 5 inches (125mm)

Approximately 1.86 pavers per square foot

Percentage of void area will vary depending on manufacturer
Please note sizes may vary - contact your manufacturer for availability.


Architectural Product Sheet


UNI-Ecoloc® is also designed for heavy-duty pavement applications and mechanized installation for labor cost savings. The paver is designed to fit together with our UNI-Anchorlock® traditional paver to allow for a combination of permeable and impermeable areas. This paver has become popular for use in streets and parking lots, as well as for industrial pavements, such as ports and storage yards.



Thickness: 3 1/8 inches (80mm)
Unit is an L shape with two equal sides and two false joints
Outside Length: Approx. 8 7/8 inches (225mm)
Inside Length: Approx. 4 1/2 inches (112.5mm)
Width: 4 1/2 inches (112.5mm)

Percentage of void area per sq ft:: 12.18%

Approximately 2.41 pavers per square foot

Contact your manufacturer for availability


Architectural Product Sheet