To determine the depth, divide the total retaining wall height (in inches) by 8. So, if you're planning to build a 4-foot retaining wall, convert 4 feet to inches (4 times 12) to get 48 inches.

If you decide to branch out, research the ideal material based on your climate, soil type, and your own building level. Building a stackable retaining ... to 50 feet to ensure your wall won ...