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Landscape timber retaining wall2/28/2024 Today MCA is the standard industry treatment used as the lumber preservative as kind of the second generation post CCA day’s treatment. When CCA timbers were no longer made the industry mostly went to ACQ then MCQ and now MCA. CCA treated lumber is still manufactured for in-ground structural applications such as poles for a pole barn. While the treatment pounds per cubic feet has decreased it is not very telling because the treatments substances are so different.įor years the treatment used was CCA this was the one which was voluntarily taken off the market for non-structural purposes by the industry due to the arsenic levels. 16 means that for every cubic foot of wood the timber has soaked in. 16 and are meant for ground contact and carry a lifetime limited warranty.Ī treatment level of. The timbers which we offer are treated to the second tier of treatment which is. This type of treated lumber is good for above ground use only. The lowest treatment level which is commonly used on cheaper timbers from box stores and other sources is. The current treatment for landscape timbers is MCA or Micronized Copper Azole. Some Additional Information About Timbers Take a close look at other timber walls.Tack landscape fabric to back of wall if the soil is sandy.Place a deadman every 4 rows up minimum.If the wall butts up against the house, angle deadman away from house (weakest point).Deadman should be 4' long, level into bank.Use 10" spikes or screws for 6" x 6" or larger timbers. 5" x 5" or 6" x 6" timbers are good for most applications.Make your first row straight and level. For long term preservation of treated timbers cuts and bore holes need to be liberally coated with a suitable wood preservative like a Copper Napthenate solution containing minimum 1% metallic copper. The preservative used in timbers is highly corrosive, so be sure to use stainless steel connectors, heavily galvanized spike, or screws specifically intended for treated wood. We use only red pine timbers which are much better quality than SPF timbers. SPF which stands for spruce / pine/ fir wood are less expensive to produce and are much more likely to degrade by warping, drying, and cracking. When shopping for timbers be sure to find out what kind of wood they are made from. Here, 40 creative retaining wall ideas that are a step above the rest.6" x 8" x 8' Ground Contact - Red Pine - 24 per bundle actual measurements 5½” x 7 ½” x 8’Ħ" x 6" x 8' Ground Contact - Red Pine - 32 per bundle actual measurements 5 ½” x 5 ½” x 8’ĥ" x 5" x 8' Ground Contact - Red Pine - 36 per bundle actual measurements 5” x 5” x 8’ “Steep surfaces almost always have to have some sort of intervention in one way or another.” Retaining wall materials including concrete blocks, bricks, wall stones, railroad ties, or treated timbers-allowing for plenty of hardscaping options that suit your house. “Flatter and uniformed surfaces are more expensive than steep ones,” Lobeira says. What’s more, creating a retaining wall can boost the value of your house. “Many retaining walls end up as garden or terrace backdrops,” he adds. These builds can even double as seats or corral all your backyard greenery in a neat landscape.Īesthetically, a retaining wall can turn an unworkable incline on the land into usable, uniformed surfaces, notes Mauricio Lobeira, Monterrey, Mexico-based architect, interior designer and cofounder of Ten Plus Three. “They can also be used to create topographic interest or create smaller features, such as raised garden beds,” says Collin Koonce, director of landscape architecture and urban planning at BKV Group, a holistic architectural design firm, based in Washington, D.C. You might think that retaining wall ideas are all about function-after all, retaining walls prevent soil erosion and reduce the risk of flooding-but they are not all utility these structures can enhance an outdoor space by creating levels, evening out a hillside, and even using pavers to produce a pathway. “Though retaining walls are most commonly used to create a functional area out of a sloped terrain, they do serve other functions.” “At the basic level, a retaining wall is a structure that holds or retains soil behind it,” explains Joe Raboine, director of Belgard Residential Hardscapes, an outdoor hardscapes company. That is, if you’re talking about retaining wall ideas in your landscape design.
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