Which installation is performed in conjunction with water supply and vent piping prior to fixtures?

The process of Roughing-In refers to the initial stages of plumbing installation where the basic framework of the piping system is established before any fixtures are put in place. This phase includes the installation of water supply piping and vent piping, setting the groundwork for future connections to sinks, toilets, and other fixtures. Roughing-In ensures that the plumbing system is correctly laid out and meets all applicable codes before any walls or finishes are completed.

During this stage, plumbing professionals focus on the following: positioning the pipes, ensuring proper slopes for drainage, and securing any vent lines to allow for effective air circulation. As this work is foundational, it must be completed before moving on to the more detailed and visible aspects of the installation, such as Finishing, which involves the final touches and connection of fixtures.

The other options reflect different stages or aspects of plumbing installation but do not directly correspond to the initial phase where water supply and vent piping are established.