What is the primary purpose of joint compound in plumbing?

The primary purpose of joint compound in plumbing is to seal and prevent leaks. This material is specifically designed to create a tight seal at the joints and connections of plumbing systems. When water flows through pipes, it exerts pressure, and any small gaps at joints can lead to leaks if not adequately sealed. The joint compound fills these gaps, ensuring that water does not escape, which is crucial for maintaining the efficiency and integrity of the plumbing system.

Proper sealing with joint compound not only prevents water loss but also reduces the risk of damage to surrounding areas from leaks, which can lead to costly repairs and water wastage. While strengthening metal, improving aesthetic appearance, and insulating pipes are important in different contexts, they do not directly pertain to the key function of joint compound in plumbing applications.