What should PEX piping be protected from when stored?

PEX piping should be protected from ultraviolet light when stored because prolonged exposure to UV light can degrade the material, leading to a loss of structural integrity and eventual failure of the piping. This degradation can result in cracking, brittleness, and diminished performance, ultimately making the piping unsuitable for use in plumbing systems.

While moisture can cause issues such as mold or mildew in some materials, PEX is generally resistant to water and does not degrade from moisture itself. Cold temperatures might affect the flexibility of PEX, but it will not damage the material in the way that UV exposure can. Similarly, direct sunlight can also expose PEX to UV radiation, but the specific concern is the UV light itself rather than the sunlight per se. Therefore, storing PEX piping in a shaded, temperature-controlled environment is essential to maintain its durability and effectiveness.