Specifications: Uniaxial Polypropelyne and High Density Polyethelene Geogrids Depending on soils conditions, geogrid may be required for retaining walls as low as three feet. High retaining walls provide the facing for the real soil stabilizer, the geogrid CheckGrid is typically laid between the segmental retaining wall block at a predetermined coursing and embedment length to provide strength to the soil mass. All our products are tested to ASTM standards. Our HPDE and PP geogrids are not avaiable in the USA UX Geogrids, PP, HDPE CheckGridSupply Ability: 30,000 sm