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MEMBER OF <br /> HUESKER I11Ci GIC <br /> RESEARCH <br /> INSTITUTE <br /> FORTRAC GEOGRIDS <br /> INSTALLATION GUIDE FOR RETAINING WALLS <br /> Fortrac geogrids are comprised of high tenacity polyester yarns, woven into an <br /> interlocking pattern and then coated with polyvinyl chloride. They are very pliable for <br /> Inst 1lation and they are resistant to freeze-thaw conditions, soil chemicals and ultra- <br /> violet exposure. <br /> The primary reinforcing direction for all Fortrac geogrids is in the long direction of the <br /> roll (also called the machine direction). <br /> Fortrac geogrids are shipped to the jobsite in rolls; they are encased in a plastic wrap. <br /> Leave the wrap on the rolls until ready for use. This will protect the grid from <br /> unnecessary exposure and damage. <br /> Site Preparation: <br /> The contractor should excavate to the lines and grades shown on the project grading <br /> plans. The contractor should take precautions to minimize over-excavation. <br /> Foundation Soil Preparation for Reinforced Soil Zone <br /> The foundation soil shall be excavated as required for footing dimensions and limits of <br /> reinforced soil zone as shown on the construction drawings or as directed by the wall <br /> design engineer. The foundation soil should be tested by the owner to assure that the <br /> actual foundation soil strength meets or exceeds the assumed design bearing strength. <br /> Soils not meeting the required strength should be removed and replaced with soil <br /> meeting the design criteria. <br /> A compacted drainage aggregate should be placed as shown on the construction <br /> drawings. The drainage aggregate base should be compacted to provide a level hard <br /> surface on which to place the first course of modular block units. <br /> Geogrid Placement <br /> The Fortrac geogrid should be installed at the proper elevation and orientation as shown <br /> • <br /> in the wall details on the project construction plans or as directed by the wall design <br /> Engineer. Cut the geogrid to the specified length as shown in the engineers drawings. <br /> The primary reinforcing direction should be placed perpendicular to the wall face and <br /> should be one continuous piece of material. <br /> End pieces of geogrid too short to cover the full expanse of the reinforced section should <br /> be discarded or held for use on shorter sections. Adjacent sections of geogrid should be <br /> butted in a manner to assure 100% coverage after placement. <br /> 11107A South Commerce Blvd.•P.O.Box 411529.Charlotte,NC 28241 •Telephone(704)588-5500/(800)942-9418•Fax(704)588-5988 <br />