Using modular concrete blocks to build your retaining wall

If you want the look of a natural-stone wall but lack the skill to build one, a modular-block wall might be the answer. These retaining walls come in a variety of styles, patterns, and colors. There are tumbled blocks of uniform size that simulate the look of quarried granite; blocks of varying sizes that form patterns to look like natural stone; and split-faced blocks that look like what they are: concrete. In fact, these blocks are made from really strong concrete; most have a compressive strength of 5000 psi.

Block retaining-wall systems are available from a number of manufacturers. Prices vary between manufactures styles. Each company sometimes each style has its own interlocking system. Allan blocks are probable the most widely used.

Most systems are comprised of a few different components, including the basic wall blocks, corner blocks, and cap pieces. The good news is that none of the systems is too complicated, and the walls go up quickly.

The trick is to get the first course level. Then it is mostly a matter of stacking blocks and backfilling. Many systems even incorporate a setback into the design so that as you build up, the wall automatically pitches back into the retained earth behind. It is hard to avoid cutting blocks, but the only specialty tools you'll need are a masonry or diamond blade for your circular saw and a mason's chisel.

These interlocking systems are versatile enough for most designs. Curved walls can be built, and matching steps and walks can be incorporated. Some manufacturers will send a representative to help you figure out just what you need for your project.