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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 ...

Q: I have two deteriorating (but still standing) retaining walls made of timber and two even worse, leaning cinder-block retaining walls. I was planning to replace them all eventually, but to spread ...