Cut the cardboard or styrofoam to the shape you want your rock to be.
Making a river rock wall with concrete.
Pour water in the wheelbarrow and combine it with the cement and sand mixture.
In other words for a four foot wall two feet wide.
Step 5 continue to add layers being sure to stagger the joints and keep the wall level as the height increases.
Use the largest flattest rocks you have to provide a stable base.
Combine different materials with glue to create oddly shaped rocks.
You ll need to choose the method you prefer.
Without this simple footing the rocks have a tendency to move.
This footing is similar to a concrete retaining wall just not as engineered.
You ll use 5 to 6 quarts of water with a 50 pound bag of portland cement and you want to be careful to not use too much water.
The full set time is five.
Build a mold form if necessary for your concrete job.
A hot wire foam cutter works well.
Finish by applying a wedge of concrete along the base course front and back to keep the wall from shifting.
Mix the mortar in a wheelbarrow combining 3 parts sand and 1 part portland cement.
Next you can line the trench with landscape fabric and pour a bed of small rocks onto it to cover with mortar for the base or you can lay wire fencing and cover it with concrete.
Trowel the joints between the capstones with a brick jointer making them slightly concave to channel away water.
Use a plain cardboard box for a roughly square shaped rock.
Step 1 choose a material as a base for your rock s shape.
Cut a square of plywood with a circular saw 4 inches wider than you want pavers to be for example.
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Place the first layer of rocks on the concrete using the trowel to apply a 2 inch layer of cement between the rocks.
Immediately press the river rock onto the wall or floor in the predetermined location and hold it in place for several minutes until the rock is stable on the wall.
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You can use a variety of materials to create the shape of your rock.
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On hot dry or windy days mist the wall with water as you work so that the mortar cures slowly and completely.
Styrofoam cardboard crumpled newspaperstep 2 create the rough shape of your rock.
There are several common items you can choose from.
Smooth the area and tamp the soil firmly before laying any rocks.
The wide base needs to go back into the slope at least half as wide as the wall is tall.