Round Walls

Round is sound. A round structure is the most stable of wall shapes and is particularly well suited for below ground applications and in earthquake and hurricane prone environments. Build round when underground, or at least add a curve into a back bermed wall (Fig. 5.7).

5.5: A ten-foot (3m) tall wall will need a buttress with a total depth of five feet (1.5 m), spaced at every 12 feet on center. An eight-foot (2.4 m) wall will need a buttress four feet (1.2 m) deep, and a six foot (1.8m) tall wall requires a buttress that is three feet (0.9 m) deep.

5.7: The ultimate form of buttressing is a complete circle.

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