During which phase of plumbing installation is it advised to test for leaks?

Testing for leaks before piping is covered or finished is critical in plumbing installation because it allows for the identification and correction of any issues prior to sealing the system. If leaks are present after the system is buried or concealed behind walls, repairs become significantly more challenging and costly. This phase ensures that all connections and joints are functioning properly, which is vital for the integrity of the plumbing system. By conducting leak tests during this stage, plumbers can prevent potential problems that might arise from undetected leaks, such as water damage or mold growth, which can have serious implications for building safety and maintenance.

Other options revolve around less effective timing for leak detection. Testing only after installation is completed may lead to difficulties in fixing leaks as accessing the system becomes complicated. Conducting checks during routine maintenance does not address issues that might arise in new installations, and testing immediately after materials are acquired does not take into account the assembly of the system, which is where leaks would actually occur. Thus, conducting tests before covering the piping is the optimal time for ensuring a reliable and durable plumbing installation.