Rhode Island Journeyman Plumber Practice Exam 2026 – The All-in-One Guide to Master Your Licensing Test!

Wood is typically not recommended for plumbing pipes in exterior walls due to its susceptibility to moisture and potential for decay. When installed in areas that can be exposed to water or high humidity, wood can absorb moisture, leading to mold growth and structural weakening over time. Additionally, wood does not provide a reliable seal against leaks, which can result in water damage to both the plumbing system and the surrounding structure.

In contrast, materials like PVC, metal, and CPVC are more suitable for plumbing applications. PVC and CPVC are both resistant to corrosion and can withstand varying temperatures, making them good choices for piping. Metal pipes, while potentially prone to corrosion, offer durability and strength that wood cannot match. Thus, wood is generally excluded from being a viable option for plumbing in exterior walls.