What kind of stains can indicate mold growth on ceilings?

Water stains or dark spots are reliable indicators of mold growth on ceilings. These stains often occur as a result of moisture issues, which create an environment conducive to mold development. When water leaks from a roof or plumbing system, it can saturate ceiling materials, leading to discoloration. The presence of these dark spots could signify not only water damage but also promote the growth of mold if the underlying moisture is not addressed.

In contrast, bright blue streaks, yellow discolorations, or red patches are not typical signs of mold presence and may indicate other issues or conditions unrelated to mold growth. Thus, recognizing water stains or dark spots is essential for identifying potential mold issues and taking appropriate action to mitigate them.