Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep enough to completely bury at least one full course, including space for 6 to 8 ...

The core of the Ecoflex systems is a tire with one sidewall removed. This is termed an Ecoflex Unit. In most applications the Ecoflex unit is filled with crushed stone or recycled concrete aggregate.

Lowe Larretta is former lead editor for Forbes Home, covering all things related to home improvement and good design. She previously worked in the decor and lifestyle spaces for digital publishers ...