By doing the steps outlined below the chances of mold returning are greatly reduced.
Have mold validation or clearance testing performed after the mold remediation company has completed the removal and before any interior reconstruction begins.
Keep the area’s plastic containment in place with the air handlers/scrubbers on until your remediation company turns them off. That equipment is turned off and immediately placed inside a plastic bag that is sealed. Otherwise, there will be backflow that will/may recontaminate the cleaned area.
So, you’ve got the mold validation/clearance document in your hand and all that noisy equipment is gone. To make sure the mold doesn’t return, the MOST IMPORTANT thing is to confirm the water intrusions are repaired completely. Where there is water mold is likely to regrow.
If you have to restore bathrooms or kitchens consider using a DensArmour product. This is widely used for new commercial buildings. It’s made from glass and can’t grow mold. There are companion mud and tape products. Most larger hardware stores have these products in stock.
After flooding or water intrusion, if the professional drying process is started, the probability of mold growth will be significantly reduced. Verify with infrared that the area is dry before removing equipment.
Interior relative humidity should register at or below 52%. At or above this level of moisture in the ambient air creates a favorable environment for mold growth.
To ensure regular use of bath exhaust fans, they should be put on a timer or motion sensor with a 15-minute delay. Opening the bathroom window is not an adequate substitute.
Bath, kitchen, and laundry clothes dryers exhaust ducts should be routed to vent to the exterior of the building and not into attics or crawlspaces. Commercial laundry facilities should not exhaust close to air handlers. Laundry clothes dryer exhaust vents should be regularly cleaned out as a preventative maintenance measure against fires as well as to ensure proper ventilation.
Interior perimeter walls should be insulated. If there is a constant significant temperature differential between the interior and exterior temperatures with no insulation, then condensation buildup inside of the wall cavities is probable and can lead to mold growth.
Rain gutters and down spouts should be cleaned out at least once per year or more often depending on surrounding vegetation. It is also recommended that gutter guards be installed on rain gutters to prevent excessive debris from entering and clogging the system. All downspouts should drain water a minimum of 18 inches from the perimeter of the building, and can be extended easily if need be.
Exterior irrigation sprinkler systems should be directed away from buildings. Whenever possible, sprinkler systems should be replaced with drip irrigation.
Vegetation around the perimeter of the building should be cut and maintained a minimum of 18 inches from the perimeter of the building to prevent holding moisture against the perimeter of the building.
Sump pumps should be tested at least once per year to be operational around Halloween right before our traditional rain and colder weather season.
Bleach should not normally be used to combat a mold issue. Bleach is a water based product and so it is only adding fuel to the fire, so to speak. Bleach also will not address the initial source of the moisture that caused the mold to develop in the first place. If an area of discoloration has been bleached or removed by other means, and the mold growth comes back in under 30 days, this is a sign of a more significant problem that needs to be professionally assessed and may require professional remediation.
Single-paned glass windows allow interior condensation buildup and subsequent saturation of surrounding building materials. All single-paned glass windows should be replaced with double paned glass whenever possible.