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Mold
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Introduction to Molds Molds produce tiny spores to
reproduce. Mold spores waft through the indoor and outdoor air continually.
When mold spores land on a damp spot indoors, they may begin growing and
digesting whatever they are growing on in order to survive. There are molds
that can grow on wood, paper, carpet, and foods. When excessive moisture or
water accumulates indoors, mold growth will often occur, particularly if the
moisture problem remains undiscovered or un-addressed. There is no practical
way to eliminate all mold and mold spores in the indoor environment; the way
to control indoor mold growth is to control moisture. Basic Mold Cleanup The key to mold control is
moisture control. It is important to dry water damaged areas and items within
24-48 hours to prevent mold growth. If mold is a problem in your home, clean
up the mold and get rid of the excess water or moisture. Fix leaky plumbing
or other sources of water. Wash mold off hard surfaces with detergent and
water, and dry completely. Absorbent materials (such as ceiling tiles &
carpet) that become moldy may have to be replaced. Ten Things You Should Know
About Mold – Potential health effects and symptoms associated with mold exposures include allergic reactions, asthma, and other respiratory complaints. – There is no practical way to eliminate all mold and mold spores in the indoor environment; the way to control indoor mold growth is to control moisture. – If mold is a problem in your home or school, you must clean up the mold and eliminate sources of moisture. – Fix the source of the water problem or leak to prevent mold growth. – Reduce indoor humidity (to 30-60% ) to decrease mold growth by: venting bathrooms, dryers, and other moisture-generating sources to the outside; using air conditioners and de-humidifiers; increasing ventilation; and using exhaust fans whenever cooking, dishwashing, and cleaning. – Clean and dry any damp or wet building materials and furnishings within 24-48 hours to prevent mold growth. – Clean mold off hard surfaces with water and detergent, and dry completely. Absorbent materials such as ceiling tiles, that are moldy, may need to be replaced. – Prevent condensation: Reduce the potential for condensation on cold surfaces (i.e., windows, piping, exterior walls, roof, or floors) by adding insulation. – In areas where there is a perpetual moisture problem, do not install carpeting (i.e., by drinking fountains, by classroom sinks, or on concrete floors with leaks or frequent condensation). – Molds can be found almost anywhere; they can grow on virtually any substance, providing moisture is present. There are molds that can grow on wood, paper, carpet, and foods. – If you have IAQ and mold issues in your school, you should get a copy of the IAQ
Tools for Schools Kit. Mold is covered in the IAQ
Coordinator's Guide under Appendix H - Mold and Moisture . Asthma and Mold Molds can trigger asthma
episodes in sensitive individuals with asthma. People with asthma
should avoid contact with or exposure to molds. EPA's Asthma
web site
EPA's Asthma Brochure
EPA's Mold
page from Asthma web site – Allergy & Asthma Network/Mothers of Asthmatics (AAN/MA): (800) 878-4403; www.aanma.org – American Academy of Allergy, Asthma & Immunology (AAAAI): www.aaaai.org – American Lung Association: 1-800-LUNG-USA (1-800-586-4872); www.lungusa.org – Asthma & Allergy Foundation of America: (800) 7ASTHMA; www.aafa.org – Canada Mortgage & Housing Corporation fact sheets on mold - www.cmhc-schl.gc.ca/en/burema/gesein/abhose/abhose_50.cfm – National Institute of Allergy and Infectious Diseases: www.niaid.nih.gov – National Jewish Medical and Research Center: (800) 222-LUNG (5864); www.njc.org Health
and Mold How do molds affect people? Some people are sensitive to
molds. For these people, exposure to molds can cause symptoms such as nasal
stuffiness, eye irritation, wheezing, or skin irritation. Some people, such
as those with serious allergies to molds, may have more severe reactions.
Severe reactions may occur among workers exposed to large amounts of molds in
occupational settings, such as farmers working around moldy hay. Severe
reactions may include fever and shortness of breath. Some people with chronic
lung illnesses, such as obstructive lung disease, may develop mold infections
in their lungs. EPA's publication, Indoor
Air Pollution: An Introduction for Health Professionals ,
assists health professionals (especially the primary care physician) in
diagnosis of patient symptoms that could be related to an indoor air
pollution problem. It addresses the health problems that may be caused by
contaminants encountered daily in the home and office. Organized according to
pollutant or pollutant groups such as environmental tobacco smoke, VOCs,
biological pollutants, and sick building syndrome, this booklet lists key
signs and symptoms from exposure to these pollutants, provides a diagnostic
checklist and quick reference summary, and includes suggestions for remedial
action. Also includes references for information contained in each
section. This booklet was developed by the American Lung Association, the
American Medical Association, the U.S. Consumer Product Safety Commission, and
the EPA. EPA Document Reference Number 402-R-94-007, 1994. Allergic Reactions -
excerpted from Indoor Air Pollution: An Introduction for Health
Professionals section on: Animal Dander, Molds, Dust Mites, Other Biologicals
. "A major concern
associated with exposure to biological pollutants is allergic reactions,
which range from rhinitis, nasal congestion, conjunctival inflammation, and
urticaria to asthma. Notable triggers for these diseases are allergens
derived from house dust mites; other arthropods, including cockroaches; pets
(cats, dogs, birds, rodents); molds; and protein-containing furnishings,
including feathers, kapok, etc. In occupational settings, more unusual
allergens (e.g., bacterial enzymes, algae) have caused asthma epidemics.
Probably most proteins of non-human origin can cause asthma in a subset of
any appropriately exposed population." Consult the Centers for Disease
Control (CDC) website – CDC's National
Center for Environmental Health (NCEH) has a toll-free telephone
number for information and FAXs, including a list of publications: NCEH
Health Line 1-888-232-6789. – CDC's "Molds in the Environment" Factsheet – Stachybotrys or Stachybotrys atra (chartarum) and health effects – CDC's "Questions and Answers on Stachybotrys chartarum and other molds Homes and Molds The EPA publication, "A
Brief Guide to Mold, Moisture, and Your Home" , is available here in HTML
and PDF formats. This Guide provides
information and guidance for homeowners and renters on how to clean up
residential mold problems and how to prevent mold growth. A printed
version will be available soon. Biological
Pollutants in Your Home - This document explains indoor
biological pollution, health effects of biological pollutants, and how to
control their growth and buildup. One third to one half of all structures
have damp conditions that may encourage development of pollutants such as
molds and bacteria, which can cause allergic reactions -- including asthma --
and spread infectious diseases. Describes corrective measures for
achieving moisture control and cleanliness. This brochure was prepared
by the American Lung Association and the U.S. Consumer Product Safety
Commission. EPA Document Reference Number 402-F-90-102, January 1990. Moisture control is the
key to mold control, the Moisture Control Section from Biological
Pollutants in Your Home follows: Moisture Control Water in your home can come
from many sources. Water can enter your home by leaking or by seeping through
basement floors. Showers or even cooking can add moisture to the air in your
home. The amount of moisture that the air in your home can hold depends on
the temperature of the air. As the temperature goes down, the air is able to
hold less moisture. This is why, in cold weather, moisture condenses on cold
surfaces (for example, drops of water form on the inside of a window). This
moisture can encourage biological pollutants to grow. There are many ways to
control moisture in your home: – Fix leaks and seepage. If water is entering the house from the outside, your options range from simple landscaping to extensive excavation and waterproofing. (The ground should slope away from the house.) Water in the basement can result from the lack of gutters or a water flow toward the house. Water leaks in pipes or around tubs and sinks can provide a place for biological pollutants to grow. – Put a plastic cover over dirt in crawlspaces to prevent moisture from coming in from the ground. Be sure crawlspaces are well-ventilated. – Use exhaust fans in bathrooms and kitchens to remove moisture to the outside (not into the attic). Vent your clothes dryer to the outside. – Turn off certain appliances (such as humidifiers or kerosene heaters) if you notice moisture on windows and other surfaces. – Use dehumidifiers and air conditioners, especially in hot, humid climates, to reduce moisture in the air, but be sure that the appliances themselves don't become sources of biological pollutants. – Raise the temperature of cold surfaces where moisture condenses. Use insulation or storm windows. (A storm window installed on the inside works better than one installed on the outside.) Open doors between rooms (especially doors to closets which may be colder than the rooms) to increase circulation. Circulation carries heat to the cold surfaces. Increase air circulation by using fans and by moving furniture from wall corners to promote air and heat circulation. Be sure that your house has a source of fresh air and can expel excessive moisture from the home. – Pay special attention to carpet on concrete floors. Carpet can absorb moisture and serve as a place for biological pollutants to grow. Use area rugs which can be taken up and washed often. In certain climates, if carpet is to be installed over a concrete floor, it may be necessary to use a vapor barrier (plastic sheeting) over the concrete and cover that with sub-flooring (insulation covered with plywood) to prevent a moisture problem. – Moisture problems and their solutions differ from one climate to another. The Northeast is cold and wet; the Southwest is hot and dry; the South is hot and wet; and the Western Mountain states are cold and dry. All of these regions can have moisture problems. For example, evaporative coolers used in the Southwest can encourage the growth of biological pollutants. In other hot regions, the use of air conditioners which cool the air too quickly may prevent the air conditioners from running long enough to remove excess moisture from the air. The types of construction and weatherization for the different climates can lead to different problems and solutions. Moisture On Windows Your humidistat is set too
high if excessive moisture collects on windows and other cold surfaces.
Excess humidity for a prolonged time can damage walls especially when outdoor
air temperatures are very low. Excess moisture condenses on window glass
because the glass is cold. Other sources of excess moisture besides overuse
of a humidifier may be long showers, running water for other uses, boiling or
steaming in cooking, plants, and drying clothes indoors. A tight, energy
efficient house holds more moisture inside; you may need to run a kitchen or
bath ventilating fan sometimes, or open a window briefly. Storm windows and
caulking around windows keep the interior glass warmer and reduce
condensation of moisture there. Humidifiers are not
recommended for use in buildings without proper vapor barriers because of
potential damage from moisture buildup. Consult a building contractor to
determine the adequacy of the vapor barrier in your house. Use a humidity
indicator to measure the relative humidity in your house. The American
Society of Heating and Air Conditioning Engineers (ASHRAE) recommends these
maximum indoor humidity levels. Outdoor Temperature --
Recommended Indoor Relative Humidity
+20 F 35%
+10 F 30%
0 F 25%
-10 F 20%
-20 F 15%
Anne Field, Extension
Specialist, Emeritus, with reference from the Association for Home Appliance
Manufacturers ( www.aham.org
). Should
You Have the Air Ducts in Your Home Cleaned? - excerpt on duct
cleaning and mold follows, please review the entire document for additional
information on duct cleaning and mold. You should consider
having the air ducts in your home cleaned if: There is substantial
visible mold growth inside hard surface (e.g., sheet metal) ducts or on other
components of your heating and cooling system. There are several important
points to understand concerning mold detection in heating and cooling
systems: – Many sections of your heating and cooling system may not be accessible for a visible inspection, so ask the service provider to show you any mold they say exists. – You should be aware that although a substance may look like mold, a positive determination of whether it is mold or not can be made only by an expert and may require laboratory analysis for final confirmation. For about $50, some microbiology laboratories can tell you whether a sample sent to them on a clear strip of sticky household tape is mold or simply a substance that resembles it. – If you have insulated air ducts and the insulation gets wet or moldy it cannot be effectively cleaned and should be removed and replaced. – If the conditions causing the mold growth in the first place are not corrected, mold growth will recur. |