Hi, I'm going to be making some wet pour concrete blocks that will be stacked on top of each other to form a small diving wall in my yard. It will only be about 18" tall and the blocks will be 6"x16" at 8" wide. I'm trying to decide whether I should go through the trouble of incorporating an interlocking registration feature into the blocks or if just using adhesive would be sufficient. I was thinking if I did go with adhesive that 100% silicone would be a good choice since it's flexible and doesn't break down over time. Anyone have experience with this? Thanks

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I think an interlocking block would be best.  They do sell an adhesive for block walls at hardware stores...

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