Pacific GeoSource has a full range of GeoGrid products to provide performance and cost benefits for any road structure, pavement or retaining wall/steep slope. Our RockGrids for example are used to reinforce the unbound aggregate layers that form the sub-base and/or base course layers in road structures. By including a RockGrid within one or both of these layers the engineer can extend the life of the road or reduce the layer thickness leading to substantial initial cost savings.

These products have been used extensively worldwide for 30+ years and have gained formal recognition in the US from the likes of The US Army Corps of Engineers, The American Railway Engineering and Maintenance-of-way Association and more than 40 State Departments of Transportation. Our RockGrids are available in roll widths of 2.95m, 3.95m, 4.95m and 5.95m (9.7 ft, 13.0 ft, 16.2 ft and 19.5 ft.). It should be noted that Pacific GeoSource is the only company in the US able to supply 19.5 ft wide rolls. We are therefore in a unique position to help the contractor and owner reduce wastage costs to an absolute minimum!

When reflective cracks migrate to the surface, the long-term integrity of flexible and composite pavements can be quickly compromised. Conventional practice in dealing with this type of distress is to mill the top few inches and overlay the remaining pavement with “fresh” asphalt. When a geogrid interlayer product is included within the overlay, the time for reflective cracks to appear again is typically extended two to three fold. Inclusion of geogrid interlayers can therefore significantly reduce the long-term maintenance costs for pavement owners. A variety of Pacific GeoSource RockGrids are available to help mitigate different crack types and degrees of severity.


What is an Pacific GeoSource RockGrid?

Pacific GeoSource RockGrids are plastic, grid-like products delivered to a job site in roll form. Manufactured using polypropylene, these products feature high stiffness at low strain and excellent resistance to installation damage and environmental effects (UV, chemical, biological attack, etc.). RockGrids have been used successfully in roadway applications for more than 30 years.

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How do Pacific GeoSource RockGrids work?

Pacific GeoSource RockGrids are manufactured such that their ribs and apertures form an integral structure. This facilitates “mechanical interlock” as larger aggregate particles partially penetrate through the RockGrid’s apertures. Once the overlying aggregate is compacted, the effect is to provide an efficient means by which to transfer dynamic loads to the RockGrid and thereby form a composite material with increased stiffness and better performance when trafficked.


  • Unpaved roads and temporary working surfaces
  • Conventional and heavy-duty pavements
  • Rail structures