The Q&A Archives: Retaining Wall

Question: My wife and I want to build a retaining wall and use it as the edge of a large planter box. We want to use the mortar-less stackable bricks. I know that these types of bricks are not supposed to go up very high, but we need the wall to be about 5 to 5.5 feet tall. I know it can be done, but I don't know how. can you help me??

Answer: Because stackable blocks are not reinforced, they are best suited for walls under four feet in height. If you want to use the material, the best approach is to build a segmental wall so that each segment has a height of only 2 1/2 feet. You'll need to backfill and compact the soil for the first segment and then build the second segment a few feet behind the first wall. This will increase your planting area and ensure the wall doesn't lean or tumble a few years after installation.

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