Structure
Earth lodges were typically constructed using wattle and daub technique, with a thick coating of earth. The dome-like shape of the earth lodge was achieved by the use of angled (or carefully bent) tree trunks, although hipped roofs were also sometimes used. During construction the workers would dig an area a few feet beneath the surface, allowing the entire building to have a floor somewhat beneath the surrounding ground level. They set posts into holes in the ground around the edges of the earth lodge, and made the tops meet in (or near) the middle. This construction technique is sturdy and can produce large buildings (some as much as 60 feet (18 m) across), in which more than one family would live. Their size is limited by the length of available tree trunks. Internal vertical support posts were sometimes used to give additional structural support to the roof rafters.
After a strong layer of sticks (or reeds) was wrapped through and over the radiating roof timbers, the people often applied a layer of thatch as part of the roof. The structure was then entirely covered in earth. The earth layer (and the partially subterranean foundation) provided insulation against the extreme temperatures of the Plains.
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