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 ...

Segmental retaining wall (SRW) units are one of the most versatile landscaping tools in the homeowner’s and professional landscaper’s toolbox. Retaining wall units have evolved from just being used to ...