American Home Inspectors Training (AHIT) Practice Test

Galvanized supply pipes are known to rust from the inside out due to their construction. These pipes are made of steel that has been coated with zinc to help prevent corrosion. Over time, the zinc coating can degrade, especially in the presence of moisture, minerals, and the chemicals found in water. Once the protective layer is compromised, the iron in the steel begins to corrode, which can lead to rust formation on the interior surfaces of the pipe. This internal rusting can create issues such as reduced water flow and contamination of the water supply, as rust can flake off and enter the plumbing system. In contrast, copper pipes are resistant to rusting, although they can develop corrosion over long periods under certain conditions. Plastic pipes, such as PVC, do not rust at all, as they are not made of metal. Each material has different properties and vulnerabilities, making it essential to recognize the weaknesses of galvanized pipes when considering plumbing systems and conducting inspections.