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Diagnosing
and remedying mold and moisture problems requires good detective
skills, proper safety precautions, and a working knowledge of
the best practices for mold cleanup and building rehabilitation.
Before you address any extensive mold problem, it's important
to get qualified training and to understand all the factors
that may lead to moisture damage. This checklist highlights
some of the basics of mold remediation.
Key Causes of Mold and Moisture Problems
o Plumbing leaks
o Roof leaks, often caused by ice dams
o Damp basements and crawlspaces
o Inadequate or blocked gutters and spouting
o Gaps in window and door flashing
o Poorly designed or constructed walls (for example, wrong placement
of vapor barriers, poor insulation, no drainage planes, air
channels)
o Other flaws in rain management systems
o Failure to use, or inadequate, kitchen and bathroom vents
o Unvented, or blocked vents, for heaters and other combustion
appliances
o Leaky or uninsulated ducts
o Excessive use of humidifiers
Investigating
a Suspected Mold Problem
o Wear a mask (HEPA filter if you suspect there's a major problem)
and goggles. Put on gloves and protective clothing, if necessary.
o Interview the residents about any health problems and leaks.
o Assess the extent of the contamination and what level of remediation
is required.
o Mold usually forms dark patches, but it can be other colors.
Look for stains along the edge of wallpaper, paneling, and baseboards.
Pull up or remove a small piece in a suspected area, but stop
if you see a heavy growth.
o If you find a major problem, seal off the area and keep residents
out of the room or house.
Basic Cleanup Procedures
o Get rid of any water and dry out the area.
o Cover or remove nearby furniture. Seal off vents and ducts.
o Wash off surface mold with a baking soda or vinegar solution
or with TSP or another strong cleaning agent. TSP is corrosive.
Be sure to protect your skin and eyes when using it.
o Dry items that aren't moldy within 48 hours. Dry and clean
moldy items that are reusable. Discard porous items that can't
be salvaged.
o Remove and bag all contaminated materials.
o Clean all surfaces. Vacuum the surfaces to be cleaned with
a vacuum equipped with a HEPA filter or with a centrally exhausted
vacuum cleaner, in order to remove any loose debris, HEPA vacuuming
or exhausting to the exterior prevents dispersion of spores
and fungal particles back into the house. Scrub the floor, if
needed.
o Discard all vacuum bags and rags.
o Ventilate and dry the area again. Check that all surfaces
are clean (use the white glove test).
o Obtain and follow full remediation practices for all moderate
or extensive mold problems. (See Resource list in the Mold in
Houses Technical Bulletin.)
o Determine what has caused the moisture penetration or condensation.
Fix the problem immediately.
Assessing the Cause and Extent
o Determine if there was any specific leak or event that caused
the damage. Plumbing and roof leaks are frequent culprits. In
winter, check for ice dams and roof leaks. Remember that there
can be more extensive damage than what is visible.
o Use a moisture meter to test the dampness in suspect walls
or surfaces.
o Remove a small section of a wall or ceiling if you suspect
a hidden problem.
o Look for peeling paint, stains on the siding, or bulges in
the walls or ceilings.
o Check window, door, and chimney flash-ings. Look for gaps
in siding.
o Look for kitchen and bathroom vents and find out whether they
are used.
o Check out other ventilation systems. Determine if there are
humidifiers in use.
o If there are no obvious leaks or moisture sources, consider
how moisture could be migrating and condensing on colder surfaces.
Cathedral ceilings and walls with poor insulation and wall design
are good suspects for this phenomenon.
o Check basements or crawlspaces for dampness. Determine if
there are rain gutters and spouting, and if they are clear and
directed into a drainage system or away from house.
o Assess the air flow patterns in the house.
o Check for unvented, or blocked vents, for combustion appliances.
Determine how makeup air is supplied for the heaters.
o Check for duct leaks and uninsulated ducts, particularly in
unconditioned spaces. Check the air conditioning and verify
that it is properly sized.
o If the house has an exterior insulated and finish (EIFS) wall
system, check all flashings and determine if the wall system
has proper drainage planes.
o If you can't determine, or are uncertain about, what is causing
the damage, contact a moisture auditor or another building performance
professional to investigate the situation. The best practice
is to diagnose and solve the underlying problems, not just guess.
Any moisture and mold that is not remedied can continue to cause
structural and health problems for the residents.
o Testing for mold is usually not helpful. It can be used to
pinpoint problem areas or to verify that mold counts are reduced.
To be verifiable, mold testing must be done by a qualified technician
and assessed by a certified laboratory.
Cleanup
Protocols for Moderate or Extensive Damage
o
Hire a professional service or obtain the necessary training
for cleaning and repairing moderate or extensive mold damage.
You can endanger your own health and that of the occupants if
you don't follow the recommended procedures. You can also leave
mold residues that will continue to grow.
--Gloria Fultz
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Gloria Fultz is publications assistant for Affordable Comfort,
Incorporated.
A longer checklist and two other documents, Mold in Houses Technical
Bulletin and Resource 1st, are available on the Affordable Comfort
Web site, www.affordablecomfort.org.
HOME ENERGY MAGAZINE, JULY/AUGUST 2002
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