We have 50 feet of retaining wall to install. It's tallest retaining point is about 24 inches. The wall will retain 24 inches for about 25 feet, then it will retain about 18 inches for another 25 feet.
We don't want to build a concrete block wall. We plan to use wood or railroad ties that we can install ourselves.
Location is Central California - no heavy frost or other weather-related issues.
Couple of questions.
1. We think that the vertical posts should be 4x4s or 6x6s. The horizontal retaining boards should be 2x6s. Either using redwood untreated or the preservative-green treated wood.
Do the materials sound correct?
2. How far into the ground should we sink the vertical posts? We would like to install without cement.
3. How far should the vertical posts be from each other?
4. If we use redwood, should it be treated with a preservative also?
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