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Community Education: Mold in Residential Homes

What Is Mold?

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Mold is a type of fungus that grows in damp, humid, or water-damaged environments. It can grow on walls, ceilings, wood, carpet, insulation, drywall, HVAC systems, and furniture. Mold spreads through microscopic spores that travel through the air and can quickly multiply when moisture is present.

 

While mold naturally exists outdoors, indoor mold growth may become a serious concern when moisture problems are not properly addressed.

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Common Causes of Mold in Homes

Water Intrusion

  • Roof leaks

  • Plumbing leaks

  • Basement flooding

  • Foundation cracks

  • Window or siding leaks

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High Humidity

  • Poor ventilation

  • Excess indoor moisture

  • Bathrooms without exhaust fans

  • Humid climates​

Construction & Building Issues

  • Improper flashing or sealing

  • Poor drainage systems

  • Inadequate waterproofing

  • Improper HVAC installation

  • Wet building materials during construction

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Appliance & HVAC Problems

  • Leaking water heaters

  • Condensation from HVAC systems

  • Dirty drip pans or ductwork

  • Improperly vented dryers

Signs You May Have Mold

  • Musty or earthy odors

  • Visible discoloration on walls or ceilings

  • Bubbling paint or warped drywall

  • Water stains

  • Persistent condensation

  • Allergy-like symptoms that improve outside the home

  • Recurring respiratory issues

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Potential Health Issues Associated With Mold Exposure

Some individuals may be more sensitive to mold exposure than others, especially:

  • Children

  • Elderly individuals

  • People with asthma or allergies

  • Individuals with weakened immune systems

Possible Symptoms Include:

  • Coughing

  • Sneezing

  • Sinus congestion

  • Headaches

  • Skin irritation

  • Eye irritation

  • Wheezing

  • Fatigue

  • Difficulty breathing

  • Aggravated asthma symptoms

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If you believe mold may be affecting your health, consult a licensed healthcare professional.

Mold Testing Options

Professional Mold Inspection

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A certified mold inspector can evaluate the property for:

  • Moisture intrusion

  • Air quality

  • Hidden mold behind walls or under flooring

  • HVAC contamination

Professional testing may include:

  • Air sampling

  • Surface sampling

  • Moisture mapping

  • Thermal imaging

 

 

If you suspect significant mold contamination, seek guidance from qualified remediation and inspection professionals.

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When Should You Consider Mold Testing?

You may want to consider testing if:

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  • Your home has experienced water damage

  • You notice a persistent musty odor

  • Family members are experiencing unexplained symptoms

  • There are visible signs of moisture or staining

  • You are purchasing a home

  • A home has recently been renovated or newly constructed

 

Resources

  • U.S. Environmental Protection Agency (EPA)

  • Centers for Disease Control and Prevention (CDC)

  • Indoor Air Quality Association (IAQA)

 

 

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Educational information only. This page is not medical or legal advice.

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