Changes made during the building process are reflected in which type of drawing?

As-built drawings are crucial in the construction and plumbing industries as they provide an accurate representation of the final state of a building after all changes and modifications have been made during the construction process. These drawings document the actual dimensions, locations, and details of the completed work, which may differ from the original plans due to on-site adjustments, unforeseen conditions, or design changes.

The importance of as-built drawings lies in their role in ongoing maintenance, renovations, and future expansions. When a plumbing system is installed, variations often occur due to design adjustments, compliance with codes, or connections to existing plumbing. Recording these in as-built drawings ensures that anyone who works on the building later has a reliable reference that reflects the true state of the plumbing and other systems.

In contrast, original drawings represent the designs as initially conceived, without accounting for any changes made during construction. Reference drawings may serve as guides but do not indicate modifications, while preliminary drawings are early versions that are subject to change and do not reflect the finished state of the project. Hence, as-built drawings are the definitive records for what was actually implemented, making them essential for accurate documentation in the plumbing field and construction in general.