What are drawn to indicate walls, windows, doors, and other elements onto an elevation?

Projection lines are used to represent walls, windows, doors, and other architectural elements in an elevation drawing. They help to accurately depict how these elements extend from the floor plan to the elevation view. Projection lines are essential for establishing the relationship between the three-dimensional features and their two-dimensional representation, ensuring that the details are correctly aligned and scaled. This clarity is crucial for anyone interpreting the elevation, including architects, builders, and clients, as it allows them to visualize how different components of the structure will appear when viewed from the outside.

While outline lines denote the outline of the elements, construction lines are typically used for temporary guides during the drafting process and do not serve the same purpose in providing final details. Reference lines can assist in locating elements but do not directly indicate the features like projection lines do.