- 1). Find a large, flat surface. Use a measuring tape and pencil to mark a line of the height and length of your wall. Place the rocks within these guidelines to plan the look of your wall. Place each rock as you would if the wall were standing. Arrange the rocks so that the flat rocks are above the river rocks for the best structural support, because the river rocks have greater thickness than the flat rocks. Leave space around each rock of about half an inch to an inch, for the cement. Plan for two to four layers of flat rocks. Match flat rocks that are the same size for structural consistency and integrity and to increase its depth to match the depth with that of the river rocks.
- 2). Dig a narrow ditch into the ground using a spade. Smooth and flatten out the ground to stabilize the wall.
- 3). Mix cement in a large bucket or wheelbarrow using a cement mixer.
- 4). Take the bottom layer of river rocks that you have laid out and put them in your desired wall location. Fill in the space between the rocks with cement. Use a trowel to lather a layer of cement on the bottom of each river rock of the second layer as you place each rock on top of the first layer. Repeat this to follow your planned, laid-out wall pattern.
- 5). Angle the rocks toward any incline you may have on the ground.
- 6). Lay a flat rock on the ground and add a layer of cement on it. Add another rock on it. Repeat this until the height of the rocks corresponds to the depth of the wall. Allow them to dry. Lather concrete onto the bottom face of the rock cluster and add them to the top of your river rock wall. Fill the spaces between each rock cluster with cement.
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