Dimension lines indicate

• A. the inside plane of the building
• B. the roof slope
• C. the foundation depth
• D. the outside plane of the building

Answer: (D)

Dimension lines show the outside size of a building—the distance between exterior faces. They are drawn as thin lines with arrowheads at each end and placed outside the object, using extension lines that connect the edges to the dimension line. The number on the line gives the measurement of that exterior span, such as the overall length, width, or height. This is why they indicate the outside plane of the building. Roof slope is shown separately by slope indicators or pitch notes, foundation depth by vertical depths in sections or foundation details, and interior dimensions are conveyed differently than exterior overall dimensions.