Like all other organisms, molds require food and water. There is enough organic material in any building to provide food for molds to grow. Even hard surfaces, such as tile, can have enough organic material, such as dirt or soap scum, to support mold growth. Moisture also supports other microorganisms, some of which are infectious agents or allergens. That is why dampness and mold are both closely associated with respiratory illnesses such as asthma, which is the leading cause of school absences.
Here are the steps needed to keep schools dry:
- If deep cleaning carpets just before or during summer season, do not close up the school and cut back the HVAC until the carpet is completely dry. Use carpet cleaning machines or “extractors” that have the Carpet and Rug Institute’s Seal of Approval to help insure rapid drying.
- Keep relative humidity in occupied spaces below 60% (50%, if feasible, to control dust mites) and below 65% elsewhere. Keep all parts of the building dry that are not designed to be wet.
- Adequately insulate exterior walls or ceilings to avoid condensation on cold surfaces. Insure that the vapor barriers in the walls are not compromised.
- Insulate cold water pipes (and cold air ducts if needed) to avoid sweating.
- Frequently inspect roofs, walls and foundations for any signs of leaks or other water intrusion problems. Assign high priority to repair and maintenance.
- Clean spills immediately. Thoroughly clean and dry liquid spills on porous surfaces such as carpet as soon as possible to prevent mold growth.
- Do not allow standing water in any location.
- Maintain proper water drainage around the perimeter of the building.
- Provide sufficient exhaust in showers or kitchen areas producing steam.
- Clean and disinfect (or sanitize) areas such as restrooms and showers that are designed to be wet.
- Consider discarding furniture, carpet, or similar porous material having a persistent musty odor or that has been wet for more than 72 hours.
- Discard ceiling tiles with any visible water stain, and fix the source of the water leakage.
(Adapted with permission from Clean & Healthy Schools For Dummies.)
