Mold is a common, pesky problem that often develops along floors, walls and across ceilings of homes. The micro-organism is a fungus that poses a real health hazard when left to proliferate in the home or business property. It can develop in areas of rising damp with constant exposure to moisture. Signs of mold in a building may indicate the presence of a leak. To thrive, mold requires moisture, food, and a suitable surface to grow on.