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The basic unit of cabin construction is the "crib," a single rectangular room, usually with a loft overhead. Logs were cut, squared, and then notched on the ends so that they could be stacked securely. After the logs were stacked, the open spaces were "chicked" with wood chips and then "chinked" with mud. A crib was from 10 x 12 feet to 18 x 24 feet in size. Cribs could be joined by "dogtrots," and sometimes double-crib cabins were built. A few of the early log cabins had stairs and a second story rather than a ladder and a loft.
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There are various ways to construct the roof of a cabin; in Southwest Virginia, the method often used was to lay long poles on the top ends of the logs making up the eaves, so that the poles (called "purlins') ran with the long axis of the crib. Boards and then shingles were used to complete the roof. This construction method was simple, but eventually resulted in sag in the center of the roof unless the poles were reinforced.
Glass was also expensive and so windows typically were small. Often the windows were constructed with few or no iron components. Doors also could be made entirely of wood.
Foundations, fireplaces and chimneys were made of stone, and mantles were usually made of hewn timbers. Some buildings were made with stone walls; these were usually out-buildings such as spring-houses and root cellars where a cool temperature was desirable for most of the year. Building stones were gathered from fields and riverbeds; the use of cut stone was unusual.
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