How To Build A Natural Rock Wall. How to build a rock retention wall 1. Place a 6 inch layer of.
Plan the where. This prevents mortar from running down the face of the wall. The trench should be deeper than the frost.
Add and tamp more layers until the footing is about 8 inches below grade.
Dig a trench that s below the frost line and 2 feet wider than the wall. Determine how many rocks you need to build your wall by measuring the planned dimensions of your wall to the nearest. After spreading the mortar but before laying the next stone use the trowel edge to cut the mortar even with wall face. Plan the where.