Cornerstone's retaining wall system is known as Sure Stone ... "A lot of ready mix producers buy these forms and pour leftover concrete into the forms and sell them," Parrish says.

In a retaining wall, these blocks are stacked together ... according to an engineer's specifications. Then, the crews pour the concrete from the truck into the forms, and allow it to cure before ...

Concrete retaining walls are engineered to last over 50 years. However, to build one, you'll have to dig a trench and pour proper, steel-reinforced footings to support this type of retaining wall.