What do very dark lines with extra heavy dashes represent?

Very dark lines with extra heavy dashes commonly represent property lines on plans. These distinctive markings are used in architectural and engineering drawings to clearly delineate the edges of a property. Understanding property lines is crucial for fire safety inspections and other regulatory assessments since they can affect building code compliance, setback requirements, and overall spatial planning.

In design documentation, property lines are clearly emphasized to ensure that any structures, landscaping, or other improvements comply with local zoning regulations. They establish the legal boundaries of the land, which is essential for determining responsibilities regarding fire safety and other codes that might apply.

The other options do not align with the purpose of heavy dashed lines. Projections on plans, boundary walls, and weight restrictions follow different conventions and represent different aspects of architectural documentation. Projections typically use standard lines, while boundary walls would be represented with solid or variously dashed lines to distinguish them from other features. Weight restrictions are generally indicated in specific notations or tables rather than through line styles.