Keeping mold at bay requires moisture control. EPA guidelines
tell you to dry water damaged areas within 48 hours to prevent
mold growth. But what do you do when hurricane-force winds and
a 20-foot storm surge break the levees protecting your neighborhood
and leave your living room underwater for days?
Katrina, one of the 26 tropical storms in the record-breaking
2005 hurricane season, is still affecting the residents of New
Orleans. Once flooded with water, the city is now overrun with
mold.
Notre Dame researchers have been studying the mold growing in
Katrina's wake to help determine safe reconstruction guidelines
and assess indoor air quality as evacuees return. The team, led
by Jennifer R. Woertz, assistant professor of civil engineering
and geological sciences, studied eight homes over a three-month
period to identify what types of mold were present, how rapidly
the mold was growing, how it was affecting indoor air quality
and if it could be safely removed while maintaining the structural
integrity of the buildings.
"Mold is everywhere," says Woertz. "Before heading to New Orleans,
we tested the lab where we work with mold on a daily basis and
recorded 60 spores per cubic meter of air. When we surveyed the
ambient air in the target homes, we found up to 20,000 spores
per cubic meter, whether we could see the mold or not. After we
broke into some of the walls, the concentration of mold spores
rose to 400,000 spores per cubic meter."
According to Woertz, the spores in the ambient air could pose
a threat to people returning to the buildings -- particularly
elderly residents and young children with weaker immune systems.
And the hidden mold would certainly cause problems for anyone
attempting reconstruction if they are not wearing the proper respirators.
Currently, the EPA has no regulations for airborne mold contamination.
"It is our hope," says Woertz, "that this study will help the
residents of New Orleans as they piece their lives and homes back
together and that the knowledge we gain will help us better assess
flood damage and mitigation efforts worldwide."
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(April 2006)
