The best kind of lumber for these walls is Douglas fir pressure treated with preservatives to discourage rot. It will be green or brown in color and rated for earth-to-wood contact. For timber walls, large timbers for can be very expensive, which is why railroad ties are a common alternative.
Read general retaining wall prices, tips and get free retaining wall estimates. CostOwl.com Wooden retaining walls start at around $20 per square foot including materials and installation if using cost-effective pressure treated lumber. If too much water or extra pressure is exerted on the wall, it could fail in spots.
Pressure-treated wood is wood that has been infused with chemical preservatives to protect the wood from rot and insects. The wood is placed in a depressurized holding tank that removes the air and replaces it with a preservative. The most important thing to understand about this pressure treatment
Pressure-treated lumber, especially made for this type of wall, is readily available in home improvement centers. Before beginning, have a plan for all the soil you'll be removing. It can be used to construct raised flower beds, to fill in low spots in your yard or to grade around your foundation.
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