Height to Width Ratio

In addition to lateral support, buttresses (as well as curves) follow criteria for determining their height to width ratio. For every foot (30 cm) of wall height, add six inches (15 cm) of width to the wall, either as total thickness, or as a curve or buttress. In other words, the

Earth Bag Width

5.6: Examples of height to width ratios for curved, freestanding walls.

height to width ratio is two to one expressed as 2:1, height to width (Fig. 5.5).

Curved walls follow the same criteria by squig-gling in a curved pattern that fulfills the height to width ratio within every 12 feet (3.6 m) of length (Fig. 5.6). Another example is that you can also increase the total thickness of the wall by making a six foot (1.8 m) high wall that is three feet (0.9 m) thick, or a four-foot (1.2 m) wall two feet (0.6 m) thick, etc. Buttressing was obviously devised to reduce materials and labor.

5.6: Examples of height to width ratios for curved, freestanding walls.

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