Why is it important to cover PVC pipe used in irrigation?

Covering PVC pipe used in irrigation is crucial primarily because PVC is not UV resistant. When PVC is exposed to sunlight and ultraviolet (UV) radiation, it can become brittle over time, leading to cracks or failures in the piping system. This degradation compromises the integrity of the irrigation system, potentially resulting in leaks or breaks that can disrupt water distribution and harm the landscaping.

While other factors like corrosion, freeze damage, or rigidity are relevant to different types of piping materials, they do not apply to PVC in the context of UV exposure. PVC is specifically chosen for its resistance to corrosion and freeze damage in many conditions. However, to maintain its durability and functionality, it must be shielded from direct sunlight to prevent UV-induced deterioration.