Inside Curves
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 Determine radius of curve |
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 Check your wall plan to determine the radius of your base course. This will be the smallest radius in the wall and must not be less than the minimum for the block system you are using. Begin by driving a stake into the ground at the desired center of the curve. Attach a string and rotate it in a circle around the stake to mark the curve in the soil. Align each block face with the curve to ensure level placement from side to side and front to back.
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 Align block lips |
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 For the second course, make sure the lip of each block is in contact with the back of the units below to ensure structural stability. The setback of the block will cause the radius of each course to gradually increase and eventually affect the running bond of the wall. To maintain proper running bond, use partial units as needed. Once a partial unit is cut to size, affix in place with a concrete adhesive.
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Outside Curves
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| Determine radius of curve |
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 When building an outside curve, begin by calculating the radius of your top course. This will be the smallest radius in the wall and must not be less than the minimum for the block system you are using.* Drive a stake into the ground at the desired center of the curve. Attach a string and rotate it in a circle around the stake to mark the curve in the soil. Align each block face with the curve to ensure level placement from side to side and front to back.
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| Align block lips |
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 For each course, make sure the lip of each block is in contact with the back of the units below to ensure structural stability. The setback of the block will cause the radius of each course to gradually decrease and eventually affect the running bond of the wall. To maintain proper running bond, use partial units as needed. Once a split unit is cut to size, affix in place with concrete adhesive.
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*To calculate the radius of your top course, add ¼ inch to the setback of your block and multiply that amount by the number of courses in your finished wall. Then subtract the results from the radius of the base course. This number must exceed the minimum requirements for the block system you're using.
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