Section lines used to indicate specific construction material should generally be drawn at an angle of?

Section lines, which are used in engineering and architectural drawings to represent different materials, are typically drawn at an angle of 45 degrees. This angle is preferred because it provides a clear visual distinction between various materials while maintaining a standard practice that is easily recognizable in technical drawings.

Using a 45-degree angle allows for sufficient space between line patterns so that they do not become overly crowded or confusing. This consistency is crucial as it helps anyone interpreting the drawing to quickly identify the material types, enhancing communication and understanding between engineers, architects, and construction teams.

Other angles such as 90 degrees, 30 degrees, and 60 degrees may not provide the same level of clarity or could be less conventional, making them less suitable for representing construction materials in section views. Thus, the use of a 45-degree angle becomes the standard practice in the industry.