What is the usual symbol for exterior walls on drawings?

What is the usual symbol for exterior walls on drawings?

• A. A pair of parallel lines
• B. A solid filled rectangle
• C. Dashed line with hatch
• D. Hatched area

Answer: (A)

Exterior walls on drawings are shown as a pair of parallel lines. This double-line representation communicates both the location of the wall and its thickness, which helps distinguish exterior boundaries from interior partitions and other features. A solid filled rectangle would obscure length, openings, and relationship to surrounding spaces. A dashed line with hatch is typically used for hidden features, section indicators, or underlying structures, not the visible exterior boundary. Hatched areas mark materials or zones, not the boundary line itself. So the double parallel lines provide the clearest, most conventional depiction of exterior walls on standard drawings.

Exterior walls on drawings are shown as a pair of parallel lines. This double-line representation communicates both the location of the wall and its thickness, which helps distinguish exterior boundaries from interior partitions and other features. A solid filled rectangle would obscure length, openings, and relationship to surrounding spaces. A dashed line with hatch is typically used for hidden features, section indicators, or underlying structures, not the visible exterior boundary. Hatched areas mark materials or zones, not the boundary line itself. So the double parallel lines provide the clearest, most conventional depiction of exterior walls on standard drawings.