Which type of drawing indicates the building's mechanical systems like plumbing and heating?

The type of drawing that indicates a building's mechanical systems, such as plumbing and heating, is indeed a mechanical drawing. Mechanical drawings are specifically designed to represent the layout and configuration of various mechanical systems within a building. This includes the design and positioning of heating, ventilation, and air conditioning (HVAC) systems, plumbing lines, electrical systems, and other essential mechanical components.

Mechanical drawings provide detailed information necessary for the construction, installation, and maintenance of these systems, making them crucial for both the builders and engineers involved in the project. They often include schematics, symbols, and annotations to convey how different elements interact within the mechanical framework of the structure.

Other types of drawings, such as section drawings, concept drawings, and detail drawings, serve different purposes. Section drawings illustrate the vertical dimensions and spatial relationships within a building, concept drawings provide a general idea of the design and layout without technical detail, and detail drawings focus on small portions of a design to show them in depth. While all these drawings are important in architectural and engineering fields, mechanical drawings uniquely highlight the specifics of mechanical systems, which is why they are the correct choice for this question.