What type of materials should be avoided when plumbing systems are exposed to high moisture?

Plumbing systems exposed to high moisture environments require materials that can withstand continuous exposure to water and humidity without degrading. Wood and untreated metals are not suitable choices in this context due to their susceptibility to damage. Wood can absorb moisture, leading to rot, warping, and the growth of mold and mildew, which can compromise the integrity of plumbing systems. Untreated metals are prone to rust and corrosion when exposed to moisture over time, which can lead to system failure.

In contrast, stainless steel and various plastic materials are designed to resist moisture, making them ideal for plumbing applications in wet environments. Reinforced plastics also provide durability and moisture resistance, further indicating that these materials are better suited for high-humidity conditions. Thus, avoiding wood and untreated metals is essential to ensure the longevity and reliability of plumbing systems in these conditions.