Walls 4′ and higher, terraced walls, sites with weak or wet soils, slopes and other loading conditions, such as a driveway above the wall, require special consideration. These are reinforced walls that are built using other construction techniques, including the use of geogrid and we recommend using a soils engineer and a professional contractor for these situations. Be sure to play it safe and contact your Pavers by Ideal® Dealer for more information on building your wall.