Antimicrobial Use During Mold Remediation #IAQS

December 15, 2013

IAQS Bio-HazardThe goal of mold remediation is to remove or clean mold contaminated materials in a way that prevents the emission of mold and dust contaminated with mold from leaving a work area and entering an occupied or non-remediation area, while protecting the health of workers performing the mold remediation.  The goal is not to kill the mold it’s to collect and remove it.

The first step in solving an indoor mold problem is stopping the source of moisture. Next is to remove the mold growth.  Next is the proper cleaning and removal of mold contaminated personal property and building material. The proper method is the collection and removal of the mold. Improper methods for cleaning mold include the application of fungicides and biocides to kill mold. These methods may render the mold non-viable (dead or incapable of growth); however, the mold and its by-products can still elicit negative health effects. The mold is still and allergen in your home until its removed.

A mold spore is an allergen that may or may not have the presence of mycotoxins.  Some of these mold spores have the ability to germinate and may eventually grow to be a colony.  To prevent this we correct the moisture that was supporting the mold growth and wala the mold will not have the available moisture to grow.  Now all we have to do is collect the remaining allergens (aka mold spores) and remove them from the home.

If we simply apply fungicides or biocides to kill the mold so it won’t grow we still have the mold spore or allergen that may or may not have the presence of mycotoxins.  But…the mold spores are still in your home, still an allergen, still have the potential of containing mycotoxins, and are now completely covered in a poison, just Wonderful.  And the poisonous mold still needs to be removed.

New York City Department of Health NYCDH

“The use of gaseous, vapor-phase, or aerosolized biocides for remedial purposes is not recommended. The use of biocides in this manner can pose health concerns for people in occupied spaces of the building and for people returning to the treated space if used improperly.

American Industrial Hygiene Association AIHA

The goal of remediation is removal of mold and the moisture source because: a) biocides do not alter mycotoxins or allergens; b) it is generally not possible to get 100 percent kill with biocides; and c) because of (b), the newly deposited spores, re-growth will occur after the biocides if moisture returns.

North American Air Duct Cleaning Association NADCA position on Sanitizing Ductwork

The EPA has not registered any products for sanitizing or disinfecting ductwork. Further, no fungicides are registered for use in ductwork. It is a violation of federal law to use a product in a manner inconsistent with its labeling. For antimicrobials, this law is the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). Therefore, any claims of sanitizing or disinfecting ductwork would require the use of a product in a manner inconsistent with its labeling, which is a violation of FIFRA.

U.S. Environmental Protection Agency EPA

“The purpose of mold remediation is to remove the mold to prevent human exposure and damage to building materials and furnishings. It is necessary to clean up mold contamination, not just to kill the mold. Dead mold is still allergenic, and some dead molds are potentially toxic.

John P. Lapotaire, CIEC


IT’S NOT THE HEAT, IT’S THE HUMIDITY

December 9, 2013

ImageHumidity control was the problem that originally spurred the need for air conditioning. Lack of humidity control in hot, humid climates, in particular, can lead to mold growth and other moisture-related problems. High indoor humidities can lead to health and comfort problems.

Modern air conditioners dehumidify as they cool; you can see that by the water that drains away, but this dehumidification is incidental to their main job of controlling temperature. They cannot independently control both temperature and humidity.

In hot, humid climates the incidental dehumidification that occurs may not always be enough to keep the indoor humidity conditions acceptable. (ASHRAE recommends roughly a 60% relative humidity maximum at 78F.) The maximum dehumidification happens not at the hot times of the year—when the air conditioner is running a lot—but at mild times of the year when the air conditioner runs very little.

Although there are some leading edge air conditioning systems that promise to independently control humidity, conventional systems may not be able to sufficiently control the problem and can cause comfort or mold problems in certain situations. Some current high-end systems have enhanced dehumidification, but when the existing system cannot sufficiently dehumidify, it may be necessary to buy a stand-alone dehumidifier.   There are things that consumers can do to lessen the need for dehumidification:

Do not set your thermostat to the “fan on” position. In this position the fan blows air all the time whether your cooling system is running or not and one key impact is that a lot of the moisture your system just took out of the air, will be blown back into the house before it can drain way.

Use exhaust fans during moisture-producing activities. Cooking, bathing, washing, and similar activities produce a lot of moisture inside the home. Exhaust that moisture directly outdoors using a fan. Similarly, avoid drying clothes indoors except with a clothes dryer that is exhausted directly outdoors.

Do not open windows or use ventilative cooling when it is too humid outside

 

Full Story at ASHRAE https://www.ashrae.org/resources–publications/free-resources/top-ten-things-about-air-conditioning 

 


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