What is the necessary condition for a rough-in inspection to be conducted?

Rough-in inspections are crucial steps in the construction process, particularly for mechanical systems, as they ensure that the installed components are up to code before they are concealed behind walls or ceilings. The necessary condition for a rough-in inspection is primarily focused on confirming that ducting, piping, and wiring have been installed correctly but are not yet covered.

When it comes to option C, the completion of ducting and other concealed components is essential. This inspection assesses the various elements of the mechanical system, ensuring they adhere to the applicable codes and standards, allowing for any necessary adjustments or corrections before the surfaces are finished. This proactive approach helps to prevent future issues related to system performance, safety, and compliance.

Other options do not directly pertain to the immediate requirements for a rough-in inspection. For instance, the completion of final inspections is typically associated with ensuring that the entire project is finished and operational, which occurs after rough-in inspections. Similarly, the installation of wall or ceiling membranes happens after the rough-in phase, meaning it is too late to address any issues with the concealed systems. Lastly, while building permit submission is an important step in the overall project management process, it does not specifically relate to the requirements for conducting a rough-in inspection.