I want to build a three-foot-high retaining wall behind my house out of pressure-treated wood. Thoughts?—Shawn B., Sioux City, Iowa Go ahead, but do your homework. First, call 811 before you dig. The ...

Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep enough to completely bury at least one full course, including space for 6 to 8 ...

Q.I'm lucky and have lots of medium to larger rock on my lot that can be easily harvested. I want to build a stackable rock retaining wall that will be about 3 feet tall and hold back that amount of ...