best use timbers retaining wall 4 or 6

Landscape Showdown: Railroad Ties Vs. Timber - J&W Lumber

You’re best off using railroad ties “as is” – as standard 6-foot and 8-foot timbers. If you’re building something complex railroad ties might not be for you. Railroad ties are treated with creosote oil – a strong preservative made from coal and wood tar – that can make them poisonous to vegetables and a poor choice for projects

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4 in. x 6 in. x 12 ft. #2 Pressure-Treated Timber-260430

The 4 in. x 6 in. x 12 ft. Pressure-Treated Pine Lumber has been treated to protect it against termites fungal decay and rot. It is a good wood for retaining walls decks walkways and other outdoor projects.

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Retaining Walls: How to Build Them Costs & Types - This Old

All retaining walls should lean into the hill 1 inch for every 12 inches of height. Timber walls 4 feet or higher should be tied to the hillside with "deadmen" anchors (6-foot-long T-shaped tiebacks buried in the hillside) attached to the wall every 8 feet extending 6 feet back to a 2-foot-wide T-bar.

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Wooden Retaining Walls - Landscaping Network

A timber retaining wall is usually less than four feet tall. There are two basic construction methods each one suited to different conditions. One utilizes upright stanchions anchored in a concrete footing with horizontal wall planks usually 2 x 6.

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