What type of line represents a layout boundary in drawings?

In architectural and construction drawings, a layout boundary is typically represented by a dashed line. This is because dashed lines serve to clearly differentiate between the different elements of a drawing, indicating areas that may be conceptual or where visibility is not required for certain details. The use of a dashed line helps convey the boundary without obstructing the view of the actual layout and other important design components, allowing for a clearer understanding of the space and how various elements fit within it.

In contrast, thick solid lines are generally used to represent walls or permanent structures, while solid lines may indicate edges or outlines that are visible. Dotted lines are often employed for different purposes, such as indicating hidden elements or center lines, which further emphasizes why dashed lines are the standard choice for layout boundaries. This differentiation in line types is crucial for communication within architectural drawings, aiding in proper interpretation and execution during the construction process.