Maintaining a healthy home means understanding mold and mildew, which can cause serious health issues and property damage if not handled properly. These common problems in many homes can be more than just an eyesore– they can also pose health risks and cause damage to your property!
This blog guide will help you learn what mold and mildew are, how to spot them, and what you can do to keep your home safe and clean.
What Are Mold and Mildew?

Mold is a type of fungus that grows in clusters called hyphae. It loves damp, warm, and humid places like basements, bathrooms, and kitchens. Mold can be black, green, white, or even orange. Mold can often grow on walls, ceilings, and floors.
Mildew, on the other hand, is a type of mold that appears as a thin, white, or gray layer. It usually grows on damp surfaces like paper, fabrics, and leather. Both can have a musty smell and spread quickly if not treated.
Key Difference Between Mold and Mildew
Understanding the differences between mold and mildew is important for prevention and treatment. Mold typically looks fuzzy or slimy and can be black, green, white, or orange, while mildew appears powdery or fluffy and is usually white, gray, or yellow. Mold grows by penetrating beneath the surface of materials, making it tougher to remove, and thrives in damp, warm, and humid environments. While mildew grows on the surface of moist, organic materials like paper, fabrics, and leather, making it easier to clean.
Mold emits a strong, musty odor that often persists, whereas mildew has a musty smell that is generally less intense. Health-wise, mold exposure can cause serious issues, especially for individuals with allergies, asthma, or weakened immune systems, whereas mildew can cause mild respiratory issues and allergic reactions but is generally less harmful than mold.
Mold is commonly found in areas with significant moisture, such as basements, bathrooms, kitchens, and around leaky windows or roofs. Mildew tends to appear in specific, damp locations like shower walls, windowsills, and fabrics exposed to moisture. Removing mold can be challenging and larger problems often require professional help. Mildew, on the other hand, is easier to clean with simple household solutions like vinegar or bleach, and regular cleaning and proper ventilation can help prevent reoccurring issues.
Why Are Mold and Mildew a Problem?
Anytime you see or smell mold in your house, it’s a problem. Mold and mildew can be harmful to all people and pets and can be especially harmful to people who have specific health concerns (as previously mentioned). Common problems include:
- Health Risks: Exposure to mold and mildew can cause respiratory issues, allergies, and other health problems, especially for people with asthma or weakened immune systems.
- Breathing issues: Coughing, wheezing, and trouble breathing.
- Allergic reactions: Sneezing, runny nose, and skin rashes.
- Chronic conditions: Long-term exposure can lead to serious issues like chronic sinus infections and lung infections.
- Structural Damage: Mold can eat away at the materials in your home, such as wood, drywall, and carpet, leading to costly repairs.
- Unpleasant Odor: The musty smell from mold and mildew can be very hard to get rid of and can make your home less enjoyable and safe.
You don’t want to have to deal with serious health issues that can affect you for years to come, so we can’t stress enough about taking care of mold and mildew infestations ASAP!
Learn more about the effects of mold and mildew on your health on the Healthline website.
How Common is Mold in Buildings?
Mold is a common issue in homes and buildings. A 2017 study discovered mold in every public building examined, averaging 14 mold instances per building. Mold spores, released by outdoor molds, float through the air and enter homes via doors, windows, HVAC vents, clothing, shoes, and pets.
Once inside, spores thrive in moist environments like sinks, bathtubs, showers, leaky pipes, windows, basements, crawl spaces, and attics. They can attach to materials such as fabrics, carpet, paper, wood, ceiling tiles, dust, paint, wallpaper, and insulation.
How to Spot Mold and Mildew

Keep an eye out for signs of mold and mildew. A musty, persistent, earthy odor can indicate the presence of mold or mildew, even if it is not immediately visible. Additionally, water damage such as stains or discoloration on walls, ceilings, or floors, and peeling paint or wallpaper can signal moisture problems that lead to mold growth.
Here’s what to look for:
- Visible Growth: Look for black, green, white, or gray spots on walls, ceilings, floors, and other surfaces.
- Musty Smell: If you notice a strong, musty odor, it’s a sign that mold or mildew may be present.
- Water Damage: Check for water stains, peeling paint, or wallpaper, as these can indicate moisture problems that lead to mold growth.
Catching mold and mildew early is key!
Preventing Mold and Mildew Growth

Prevention is the best way to keep mold and mildew out of your home. Having proper ventilation and cleaning high moisture areas is a great way to start preventing mold and mildew growth. Here are ways to help prevent mold and mildew growth:
- Control Moisture/humidity: Keep your home dry by fixing leaks, using exhaust fans in the kitchen and bathroom, and using a dehumidifier if necessary. Additionally, keep indoor humidity below 60% with dehumidifiers and air conditioners. Ensure good ventilation in areas like bathrooms and kitchens.
- Improve Ventilation: Make sure your home has good airflow by opening windows and doors when possible and using fans. You can also use exhaust fans in bathrooms, kitchens, and laundry rooms to reduce moisture levels.
- Regular Cleaning: Clean your home regularly, especially in areas prone to moisture like bathrooms, kitchens, and basements.
- Fix Leaks Quickly: Repair plumbing leaks, roof leaks, or condensation issues right away to prevent moisture buildup.
What to Do if You Find Mold or Mildew
If you find mold or mildew, deal with it quickly! Small areas can be cleaned with household products. For larger issues, call in professionals. Here are some basic cleaning tips:
- Contain the Area: Seal off the affected area to stop mold spores from spreading.
- Small Areas: For small patches of mold (less than 10 square feet), you can clean it yourself with a mixture of water and detergent (or vinegar and water). Make sure to wear gloves and a mask to protect yourself from household chemicals and dust.
- Large Areas: If the mold covers a large area or if you have health concerns, it’s best to call in professionals to handle the removal safely and effectively.
- Protect Yourself: It is crucial to wear gloves, a mask, and goggles to avoid mold spores!
- Remove Moldy Materials: Throw away porous materials like drywall, insulation, and carpeting if they are heavily moldy.
- Clean and Disinfect: Use a mold-killing solution to clean non-porous surfaces, then dry the area completely.
Learn more about mold and mildew cleanup on the EPA website.
When to Call a Professional
As mentioned above, for serious mold problems, it’s best to hire professionals. They can:
- Do thorough inspections to find the extent of mold growth.
- Use specialized tools and methods to safely remove mold.
- Fix underlying moisture issues to prevent future growth.
If you are looking for mold and mildew resources in Milwaukee, WI, take a look at the Milwaukee Health Department resources.
Need Help? Call Wall to Wall Home Inspections!
At Wall to Wall Home Inspections, we help identify and assess mold and mildew issues in homes. Our experienced inspectors can help you understand the extent of the problem and recommend the best course of action. Don’t let mold and mildew take over your home – contact Wall to Wall Home Inspections today for a thorough inspection and peace of mind!
Remember, Wall to Wall Home Inspections is here to help with all your home inspection needs!
Call us at (414) 333-6325 or visit our website to schedule an inspection.
