GeoBlock® Porous Pavement

Geooblock: A System with Integrity

Geoblock® Standard 5150 (GB 5150) and the Geoblock® Porous Pavement Systems are a series of interlocking, polyethylene paving units designed to provide superior load support and turf protection for emergency and utility access lanes, auxiliary parking, golf cart pathways, trails, and other high-use application areas. The Geoblock® system provides vehicular and pedestrian load support while protecting the grass from the harmful effects of traffic. The Geoblock system covers a larger surface area per unit .5m x 1.0m x 50mm (20" x 40" x 2 inch Nominal), reducing costs and increasing ease of installation. The system's four-sided tabular, interlocking joint design aids in pattern layout and transfers shear loads from block to block. While some talk about strength per square foot, the structural integrity of the Geoblock® system is built in. The system features a four-sided tabular, interlocking block design that provides superior load-bearing performance and performance and layout design and construction flexibility. The recommended staggered placement (bricklayer’s pattern) of the individual Geoblock units further increases the system’s load distribution capabilities and maximizes the number of adjacent units used to effectively spread concentrated wheel loads over the largest possible area.

Geoblock & Geoblock5150  vs.  Rolled Ring Competitors Product

Click here for GeoBlock component specifications and configuration examples.

See how Geoblock® can help you reach your US Green Building Council (USGBC) LEED Credits confirmation goals.

Geoblock Applications
From fire access lanes to hiking trails to ATV trails, parking areas, to golf cart paths, the Geoblock® system improves both the usefulness and aesthetics of an outdoor environment:






Emergency and utility access lanes, Auxiliary parking areas, Pedestrian walkways, ATV trails and wheelchair access ways, Approaches to monuments, statues and fountains Golf cart path shoulders and aprons, Driveways, driveway shoulders and medians. Geoblock® Porous Pavement Fire Access Lane System Put to the Test [1994].

See Fire Access Lane Case Studies The City of Kentwood, Michigan & AT&T Corporate Center, Basking Ridge, New Jersey.


Managing Degraded Off-Highway Vehicle Trails in Wet, Unstable, and Sensitive Environments:
Trail hardening should be considered under the following conditions:

Existing trail impacts are causing or are projected to cause unacceptable onsite or offsite impacts, and More suitable alternative trail locations are not available, or Alternative trail locations are not environmentally acceptable or economically feasible.

Trail hardening provides the following benefits:

Defines a single trail alignment for vehicle travel.
Stabilizes surface soil conditions along the hardened trail section.
Provides a stable, durable trail surface for OHV traffic.
Halts trail widening and the development of braided trail sections.
Allows formerly used trail alignments to naturally stabilize and re-vegetate.
May provide for vegetation growth (or re-growth) within the hardened trail surface that helps to reduce visual impacts, maximize site stability and increase site productivity.

Trail hardening seeks to improve trail surfaces by one of three methods:

Replacing or capping unsuitable surface soils.
Reinforcing or augmenting existing soil structure.
Providing a 'wear and carry' surface over unsuitable soils."


Description, Qualitative Environmental, Maintenance, and Cost Comparison of 17 Alaska Trail Hardening Methods. Draft: Kevin G. Meyer, NPS-Rivers, Trails and Conservation Assistance Program, Anchorage, Alaska <> updated 2/8/2007. Selected Trail Hardening Methods 1 through 8 pages 1-5.



Palmer Hayflats Geoblock Porous Pavement System Application

The Geoblock® product was one of a variety of materials tested by the NPS and analyzed at a trail segment during the summer of 1999. Based on test results, 800 ft of Geoblock hardening trail was installed in 2000. Palmer AK Hay Flats Project



Cottonwood Creek Trail Head Geoblock Installation  Palmer Hay Flats State Game Refuge 400 foot extension. Installed in 2013. Read full article here.

Online copy of "Managing Degraded Off-Highway Vehicle Trails in Wet, Unstable, and Sensitive Environments:" here.

Wrangell-St. Elias National Park and Preserve Releases Plan To Repair ORV Trails

“This is totally awesome news with a big thank you to the Park Service. Finally, these ORV trails will be improved for local folks who use these trails for hunting, fishing, berry-picking, and access to their remote cabins,” said NPCA Alaska Sr. Regional Director Jim Stratton. “Another benefit of this plan is that the Wrangell-St. Elias hiking trail system will be expanded for all park visitors, creating new places to explore on foot while enjoying our country’s largest national park.”

Read The Full Article Here (PDF)

The Denali Commission met Dec 12, 2007 to review the Rural Road project nominations, including the Hooper Bay nomination. 
The Hooper Bay project was selected. The Denali Commission will work with Federal Highway and NRCS engineers to try to develop a
TRoad cook-book with ATV mini road (Troad) standards accepted for construction projects and access to federal highway funding to do so. 

The Alaska NPS Rivers, Trails and Conservation Assistance Program helped to coordinate an ATV Trail Hardening Project with Sea Lion Corp in Hooper Bay Alaska.  The NPS does not endorse other agencies or organizations, their views, products or services - Video, Picture & Links with Permission from NPS.

Trail helps heal Alaska Native hunting grounds

Read the Full PDF Article Here

Bethel Geoblock Porous Pavement System Demo Application


The Alaska NPS Rivers, Trails and Conservation Assistance Program helped to coordinate an ATV Trail Hardening Demonstration Project in Bethel.  The NPS does not endorse other agencies or organizations, their views, products or services - Pictures with Permission from NPS.

Nome Alaska Geoblock Porous Pavement System Application Slideshow Presentation

Summit-Lake Miam Re-Route and Trail Hardening Project Summary 2004-2005


Flexible Structural Bridge
The Geoblock® system creates a flexible structural bridge within the topsoil layer, promoting the vigorous growth of turf grass while protecting turf from the harmful effects of vehicular and pedestrian traffic. The Geoblock® Porous Pavement System is a series of interlocking blocks designed to offer turf protection and load support in areas used by heavy vehicles.  The blocks create a flexible structural bridge system within the topsoil layer to support and distribute concentrated loads.


Geoblock® Porous Pavement System

The Geoblock® system is comprised of four major components:
1) The Geoblock® unit, 2) the engineered base for support, 3) the selected topsoil infill, and 4) the selected vegetation.

Both the Geoblock® unit and the base support soil work together to support the imposed loading, while the Geoblock® unit and the topsoil contribute to the vegetative support. Other components may include a geosynthetic separation / reinforcement layer, sub-drain components, and topsoil additives, which enhance vegetative growth.

Click here for GeoBlock component specifications and configuration examples.

Geoblock® & GeoPave System Usage Guideline

Recommended Topsoil:
Suitable topsoil should be pulverized prior to filling the Geoblock® cells and contain sufficient organic content to support vegetative growth. Topsoil such as sandy loam is recommended. Clay and clay loam materials are considered unacceptable.

Recommended Engineered Base: Vegetated Systems
A recommended ‘engineered base’ consisting of clear-stone / crushed rock having an AASHTO #5 designation blended with topsoil will promote vegetative growth and provide required structural support. The aggregate portion shall have particles ranging in size from 9.5 to 25 mm (0.375 to 1.0 in) with a D50 of 13 mm (0.5 in). The percentage void-space when compacted shall be at least 30%. Topsoil, equal to but not greater than the aggregate void percentage, shall be added and blended prior to placement. The mixture shall be compacted to a density that will provide a minimum California Bearing Ratio of 7%. Under some conditions, a geotextile separation layer may be required between the natural ground and the ‘engineered base’.

Recommended Engineered Base: Non-Vegetated Systems
A recommended ‘engineered base’ for non-vegetated porous pavement systems shall be a well-graded aggregate with a fines content less than 10%. The aggregate shall be compacted to a density that will produce a California Bearing Ratio (CBR) of 7% minimum. After compaction, the surface shall be uniform with no protrusions from larger aggregate particles.

[Contact Us!] for design assistance, specifications and/or technical field support and representation.

GeoCHEM offers assistance to anyone interested in evaluating, designing, building or purchasing a Geoblock® porous pavement system.  You may access these services by [contacting us].  GeoCHEM reserves the right to withhold any information from any individual or company.


Working with the Environment
In many cities, current storm water management systems are pushed beyond their capacities by run-off from traditional hard surfaces. With over 87% open area at the surface, the Geoblock® system offers a permeable solution. The Geoblock® design allows water to percolate into the ground through drain holes in the bottom of the units, decreasing storm water run-off and allowing natural groundwater replenishment. Under rainfall simulation of 64 mm/hour (2.5 inches), the run-off coefficient for the Geoblock® system is 1.5%.  The Geoblock® units are manufactured from up to 100% recycled polyethylene and are inert to common chemicals, will not absorb moisture and are unaffected by freeze-thaw cycles.


Geoblock Technical Specifications

Geoblock® General Brochures/Case Histories

Geoblock® General Overview

An illustrative overview of the Geoblock porous pavement system.

Case Histories

Project-specific design, construction and performance case histories for the Geoblock system.


Geoblock® Design and Construction Tools

Geoblock®5150 Design and Construction Overview

Geoblock® Design and Installation Overview

A document tool containing the following design and construction information for the Geoblock system:

  • Load Information, Base Recommendations and Design Details 

  • Material Specification

  • AutoCAD® Drawings

  • Illustrated Set of Installation Guidelines

  • Time/Cost Worksheet to Calculate Installed Costs

  • Installation Performance Specification

Geoblock®5150 CSI-format Product Specification

Geoblock CSI-format Product Specification

A comprehensive product specification in CSI-format based on the Presto Geoblock material specification.


Presto Geosystems SPECMaker®
Specification Development Tool

ARCAT's SpecWizard Program Customized Geoblock® Specifications




Presto's SPECMaker®
Specification Development Tool

The SPECMaker® Specification Development Tool lets you develop complete material and construction specifications specific to the application and project details. Create Customized Geoblock® Specifications


ARCAT's SpecWizard™ Program

ARCAT's SpecWizard Program Customized Geoblock® Specifications


Presto Geosystems Video Case Studies

Geoblock Porous Pavement System Case Studies

Geoblock®Fire Access Lanes

ATV/OHM Trail-Hardening

Grass Steps

Submit Geoblock®, Geoweb®, GeoPave®, GeoRunner® or GeoTerra® Project Information:

Submit Project Information Project information will be placed in Presto's Project Library as reference and will be considered for case studies and/or magazine editorials.


Video's ONLINE


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