What should be avoided due to its harmful effects on PEX?

PEX, or cross-linked polyethylene, is a type of plastic commonly used in plumbing and radiant heating applications. One of the critical factors that can compromise the integrity of PEX piping is exposure to direct sunlight and ultraviolet (UV) light.

When PEX materials are exposed to UV light, they can undergo degradation, leading to brittleness and an increased likelihood of cracking or failing over time. This makes it crucial to protect PEX installations from direct sunlight during and after installation. For instance, when PEX is stored outside or installed in areas that receive significant sunlight, it should be covered or shielded to prevent UV exposure.

The other options, while potentially problematic under certain conditions, do not present the same level of immediate risk associated with UV light. Cold temperatures can affect the flexibility of PEX, and while extreme cold can cause issues, it does not generally lead to material degradation like UV exposure does. Prolonged exposure to water is not harmful to PEX, as it is designed to be resistant to water. High pressure, while it poses risks in plumbing systems, does not lead to the same type of material degradation caused by UV exposure.

Overall, recognizing the harmful effects of direct sunlight and UV light on PEX is essential for ensuring