In this article, we will examine mold basics, why mold grows in homes, health problems caused by mold, how to get rid of mold in your home, and how to prevent mold from growing.
Mold, Moisture, and Your Home
Mold…it’s a simple word that can bring about complex emotions! For homeowners, mold growth can cause incredible anxiety and stress. So why does mold scare so many people and what should you do if you discover mold in your house or spot mold in a home while you’re house-hunting?
- The key to mold control is moisture control.
- If mold is a problem in your home, you should clean up the mold promptly and fix the water problem.
- It is important to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth.
Why is mold growing in my home?
Molds are part of the natural environment. Outdoors, molds play a part in nature by breaking down dead organic matter, such as fallen leaves and dead trees. But indoors, mold growth should be avoided. Molds reproduce by means of tiny spores; the spores are invisible to the naked eye and float through outdoor and indoor air. Mold may begin growing indoors when mold spores land on surfaces that are wet. There are many types of mold, and none of them will grow without water or moisture.
Molds are usually not a problem indoors, unless mold spores land on a wet or damp spot and begin growing. Molds do have the potential to cause health problems.
Molds produce allergens (substances that can cause allergic reactions), irritants and, in some cases, potentially toxic substances (mycotoxins). Inhaling or touching mold or mold spores may cause allergic reactions in sensitive individuals. Allergic responses include hay fever-type symptoms, such as sneezing, runny nose, red eyes, and skin rash (dermatitis). Allergic reactions to mold are common. They can be immediate or delayed.
Molds can also cause asthma attacks in people with asthma who are allergic to mold. In addition, mold exposure can irritate the eyes, skin, nose, throat and lungs of both mold-allergic and non-allergic people. Symptoms other than the allergic and irritant types are not commonly reported as a result of inhaling mold. Research on mold and health effects is ongoing. This article provides a brief overview; it does not describe all potential health effects related to mold exposure. For more detailed information, consult a health professional. You may also wish to consult your state or local health department.
It is impossible to get rid of all mold and mold spores indoors. Some mold spores will be found floating through the air and in house dust. Mold spores will not grow if moisture is not present. Indoor mold growth can and should be prevented or controlled by controlling moisture indoors. If there is mold growth in your home, you must clean up the mold and fix the water problem. If you clean up the mold but don’t fix the water problem, then, most likely, the mold problem will recur.
Who should do the cleanup?
- If there has been a lot of water damage, and/or mold growth covers more than 10 square feet, consult with an InterNACHI inspector.
- If you choose to hire a contractor (or other professional service provider) to do the cleanup, make sure the contractor has experience cleaning up mold. Check references and ask the contractor to follow the recommendations of the EPA, the guidelines of the American Conference of Governmental Industrial Hygenists (ACGIH), or other guidelines from professional or government organizations.
- Do not run the HVAC system if you know or suspect that it is contaminated with mold. This could spread mold throughout the building.
- If the water and/or mold damage was caused by sewage or other contaminated water, then call in a professional who has experience cleaning and fixing buildings damaged by contaminated water.
- If you have health concerns, consult a health professional before starting cleanup.
Tips and techniques for cleaning mold
The tips and techniques presented in this section will help you clean up your mold problem. Professional cleaners or remediators may use methods not covered here. Please note that mold may cause staining and cosmetic damage. It may not be possible to clean an item so that its original appearance is restored.
- Fix plumbing leaks and other water problems as soon as possible. Dry all items completely.
- Scrub mold off hard surfaces with detergent and water, and dry completely.
- Absorbent or porous materials, such as ceiling tiles and carpet, may have to be thrown away if they become moldy. Mold can grow on or fill in the empty spaces and crevices of porous materials, so the mold may be difficult or impossible to remove completely.
- Avoid exposing yourself or others to mold.
- Do not paint or caulk moldy surfaces.
- Clean up the mold and dry the surfaces before painting. Paint applied over moldy surfaces is likely to peel. If you are unsure about how to clean an item, or if the item is expensive or of sentimental value, you may wish to consult a specialist. Specialists in furniture repair and restoration, painting and art restoration and conservation, carpet and rug cleaning, water damage, and fire or water restoration are commonly listed in phone books. Be sure to ask for and check references. Look for specialists who are affiliated with professional organizations.
What to wear when cleaning moldy areas:
- Avoid breathing in mold or mold spores. In order to limit your exposure to airborne mold, you may want to wear an N-95 respirator, available at many hardware stores and from companies that advertise on the Internet. (They cost about $12 to $25.) Some N-95 respirators resemble a paper dust mask with a nozzle on the front, and others are made primarily of plastic or rubber and have removable cartridges that trap and prevent most of the mold spores from entering. In order to be effective, the respirator or mask must fit properly, so carefully follow the instructions supplied with the respirator. Please note that the Occupational Safety and Health Administration (OSHA) requires that respirators fit properly (via fit testing) when used in an occupational setting.
- Wear gloves. Long gloves that extend to the middle of the forearm are recommended. When working with water and a mild detergent, ordinary household rubber gloves may be used. If you are using a disinfectant, a biocide such as chlorine bleach, or a strong cleaning solution, you should select gloves made from natural rubber, neoprene, nitrile, polyurethane or PVC. Avoid touching mold or moldy items with your bare hands.
- Wear goggles. Goggles that do not have ventilation holes are recommended. Avoid getting mold or mold spores in your eyes.
How do I know when remediation or cleanup is finished?
You must have completely fixed the water or moisture problem before the cleanup or remediation can be considered finished, based on the following guidelines:
- You should have completed the mold removal. Visible mold and moldy odors should not be present. Please note that mold may cause staining and cosmetic damage.
- You should have revisited the site(s) shortly after cleanup, and it should show no signs of water damage or mold growth.
- People should have been able to occupy or re-occupy the area without health complaints or physical symptoms.
- Ultimately, this is a judgment call; there is no easy answer. If you have concerns or questions, be sure to ask your InterNACHI inspector during your next scheduled inspection.
Moisture and mold prevention and control tips:
- Moisture control is the key to mold control, so when water leaks or spills occur indoors, ACT QUICKLY. If wet or damp materials or areas are dried within 24 to 48 hours after a leak or spill happens, in most cases, mold will not grow.
- Clean and repair roof gutters regularly.
- Make sure the ground slopes away from the building’s foundation so that water does not enter or collect around the foundation.
- Keep air-conditioning drip pans clean and the drain lines unobstructed and flowing properly.
- Keep indoor humidity low. If possible, keep indoor humidity below 60% relative humidity (ideally, between 30% to 50%). Relative humidity can be measured with a moisture or humidity meter, which is a small, inexpensive instrument (from $10 to $50) that is available at many hardware stores.
- If you see condensation or moisture collecting on windows, walls or pipes, ACT QUICKLY to dry the wet surface and reduce the moisture/water source. Condensation can be a sign of high humidity.
Actions that will help to reduce humidity:
- Vent appliances that produce moisture, such as clothes dryers, stoves, and kerosene heaters, to the outdoors, where possible. (Combustion appliances, such as stoves and kerosene heaters, produce water vapor and will increase the humidity unless vented to the outside.)
- Use air conditioners and/or de-humidifiers when needed.
- Run the bathroom fan or open the window when showering. Use exhaust fans or open windows whenever cooking, running the dishwasher or dishwashing, etc.
Actions that will help prevent condensation:
- Reduce the humidity (see above).
- Increase ventilation and air movement by opening doors and/or windows, when practical. Use fans as needed.
- Cover cold surfaces, such as cold water pipes, with insulation.
- Increase air temperature.
Testing or sampling for mold:
Is sampling for mold needed? In most cases, if visible mold growth is present, sampling is unnecessary. Since no EPA or other federal limits have been set for mold or mold spores, sampling cannot be used to check a building’s compliance with federal mold standards. Surface sampling may be useful to determine if an area has been adequately cleaned or remediated. Sampling for mold should be conducted by professionals who have specific experience in designing mold sampling protocols, sampling methods, and interpreting results. Sample analysis should follow analytical methods recommended by the American Industrial Hygiene Association (AIHA), the American Conference of Governmental Industrial Hygienists (ACGIH), or other professional organizations.
According to the Texas Department of Licensing and Regulation (TDLR), “Mold assessment activities include an inspection, investigation, or survey of a dwelling or other structure to provide the owner or occupant with information regarding the presence, identification, or evaluation of mold, the development of a mold management plan or remediation protocol, and the collection or analysis of a mold sample. Mold remediation means the removal, cleaning, sanitizing, demolition, or other treatment, including preventive activities, of mold or mold-contaminated matter. The industry is regulated to ensure that persons conducting mold assessment and remediation services in Texas are properly trained and licensed, and are following minimum standards that protect the health of workers and building occupants.”
Suspicion of hidden mold:
You may suspect hidden mold if a building smells moldy but you cannot see the source, or if you know there has been water damage and residents are reporting health problems. Mold may be hidden in places such as the backside of dry wall, wallpaper or paneling, the top-side of ceiling tiles, or the underside of carpets and pads, etc. Other possible locations of hidden mold include areas inside walls around pipes (with leaking or condensing pipes), the surface of walls behind furniture (where condensation forms), inside ductwork, and in roof materials above ceiling tiles (due to roof leaks or insufficient insulation).
Investigating hidden mold problems:
Investigating hidden mold problems may be difficult and will require caution when the investigation involves disturbing potential sites of mold growth. For example, removal of wallpaper can lead to a massive release of spores if there is mold growing on the underside of the paper. If you believe that you may have a hidden mold problem, consider hiring an experienced professional.
Cleanup and biocides:
SUMMARY: 10 things to know about mold
5. Reduce indoor humidity (to 30% to 60%) to decrease mold growth by:
a. venting bathrooms, dryers, and other moisture-generating sources to the outside;b. using air conditioners and de-humidifiers;c. increasing ventilation; andd. using exhaust fans whenever cooking, dishwashing, and cleaning.
What does a home inspection cover?
An inspection includes a visual examination of the building. During a standard inspection, the inspector evaluates and reports the condition of the foundation, grading, roof, roof structure, interior/exterior walls, ceilings, floors, doors, windows, fireplace/chimney, electrical systems, heating equipment, cooling equipment (temperature permitting), plumbing system, water heating equipment and built-in kitchen appliances. Only those items that are visible and accessible by normal means are included in the report.
Inspectors licensed by the Texas Real Estate Commission (TREC) are required to comply with the TREC Standards of Practice when inspections are performed for a prospective buyer or prospective seller of one-to-four family residential property. The Standards of Practice are the minimum levels of inspection practice required of inspectors for the accessible parts, components, and systems typically found in improvements to real property, excluding detached structures, decks, docks and fences. The inspector may provide a higher level of inspection performance than required by the standards of practice and may inspect parts, components, and systems in addition to those described by the standards of practice.
Does a home inspection include a mold assessment and/or sampling?
A mold assessment is an additional test that is typically not included in a standard home inspection (ask your real estate agent if this test is needed.)
Be sure to schedule a home inspection.
Home inspections, although not required, have become a critical step during the home buying process. You’re not just buying that amazing chef’s kitchen or perfect master bath. “You will be buying any problem issues that you likely would never have found during your tour of the home,” says Texas home inspector, Micah Stephens of SafeShield Inspections, LLC. The inspection is your opportunity to gain insight into the current condition of the home and use the material in the report to negotiate the deal and make an informed decision.
Your future deserves the attention of a professional. If you have questions or would like more information on a home inspection, please contact Micah Stephens with SafeShield Inspections, LLC at (832) 953-6992 or email Micah@SafeShieldInspections.com. Request a FREE QUOTE.