Still, health problems associated with mold growth aren’t as common as many people believe, but that doesn’t mean the mold is innocuous. Left unchecked, extensive mold damage can require professional remediation that can cost thousands of dollars. Imagine a bathroom with inadequate ventilation. Mold builds slowly on the ceiling and walls, allowing residents to scrub them clean every few weeks. But with poor cleaning habits this mold takes over and begins to eat away at the drywall itself. The same thing happens with mold trapped inside your walls, until discoloration and bad odors require that you rip out your entire wall.