Answers to General Retaining Wall Questions

How far apart should I place my walls when building a terrace?
A general rule of thumb is to take your wall height and double it. This will give you the distance needed between walls. For example if your wall is 2' high the next wall should be installed at least 4' behind the first one to make sure that you are in solid ground to build your next wall. Then you can build your next wall another 21 high. This will give you a total of 41 of retaining wall.

Can I put an Anchor Stone right on top of the ground?
Anchor stones need to be securely anchored in the ground. How deep it needs to be anchored is dependent on whether you are doing a short wall or a tall wall. A short wall is defined as any wall 3 courses or less and a tall wall as any wall 4 courses or more (remember 7 courses is the maximum recommended wall height). For a short wall we recommend burying the bottom layer 1/2 (or two inches). On a 3-course wall this will leave you 10 inches showing out of the ground. For a tall wall we recommend burying the entire bottom layer (or 4 inches). On the maximum wall height of 7 courses this will leave you 24 inches showing out of the ground. By burying the first row, you have created a stable footing to support the rest of your wall and will keep movement to a minimum.

What kind of base do I need for my Anchor Stones?
While not absolutely necessary, a 1in. bed of sand in the bottom of your trench is recommended and extremely helpful. In order for your wall to be attractive and serve it's purpose it needs to be level. By putting a 1" bed of sand in the bottom of your trench you will save yourself a lot of time when using your level on the bottom row. For tall walls (4 courses or higher) you might also mix dry cement in with your sand. After your wall is built, the cement/sand mixture will draw moisture from the ground and help secure your bottom row creating somewhat of a footer.

Why do I use landscape fabric behind my retaining wall?
The landscape fabric serves as a filter to keep small soil particles from working their way through the wall when moisture is present. Remember that any material used as a barrier behind your wall must allow moisture to come through so it can help prevent your wall from failing.

What are the advantages of having a retaining wall versus using landscape timbers?
Our retaining wall units come in many different colors to blend with your home's exterior. And unlike any products made from wood which rot, warp, and become insect and rodent motels, our products are made to be durable, flexible, and timeless.

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