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horizontal dimensions on the elevations to provide more clarity and convenience for the builders. But it is better not to repeat dimensions in both places, since it increases likelihood of making errors when one drawing or the other is revised.

B. Exterior Elevation Label the important levels including the bottom of the footing, grade, finished floor line, finished ceiling line, and roof line with the elevation datum symbol. There are two methods to label these vertical dimensions in exterior elevation drawings. One is using a vertical dimension line with horizontal lines that extend out from features lettered parallel to it. Each extension indicates what the feature is with a note on it such as top plate, finished floor, etc (Figure 41). The other is giving the elevation height of each feature from the elevation established for the finished grade of the soil around the building. In this case, elevation datum symbol is associated with each extension line to indicate each elevation height (Figure 42). Vertical distances in exterior elevations typically start above the elevation of the bottom of the footing.

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