Which of the following is an indicator of water intrusion?

Discolored walls or ceilings is a significant indicator of water intrusion because such discoloration often results from moisture damage. When water seeps into building materials, it can cause staining, mold growth, and deterioration of the substrate. Common colors seen in such discoloration can be brown, yellow, or even greenish hues, indicative of mold or mildew, which thrive in damp conditions. This visual cue alerts inspectors to possible leaks, whether through roofs, windows, or plumbing issues, and necessitates further investigation to determine the source and extent of the water intrusion.

Fresh paint on walls might be used to cover up such damage, and while new roofing can contribute to a building's overall water management, it does not directly indicate an ongoing issue with water intrusion. Clean gutters, while important for proper drainage, do not themselves indicate whether water has previously infiltrated walls or ceilings.