they can grow on virtually any organic surface destroying everything extensive materials United States Environmental Protection Agency (EPA) moisture between 30 and 60 percent Mold Course Chapter 2: | US EPA epa.gov mold only requires moisture slowly destroys everything https://www.epa.gov/mold/mold-course-chapter-2 https://www.epa.gov/mold/mold-course-chapter-2 less likely to infest your home organic materials https://www.epa.gov/mold/mold-course-chapter-2 indoor relative humidity should be kept below 60% compromise the structural integrity Mold growth Environmental Protection Agency, mold growth United States Environmental Protection Agency (EPA)