Phone answered 24/7 · Detroit, MI and nearby communities

Call 24/7: (313) 766-2970
Belle Isle Dry-Out ProsWater Damage Help · Detroit, MI

What Are the Different Types of Mold Found in Homes?

Last updated October 25, 2026

Call Now (313) 766-2970

The short answer

Common Household Mold Types

Aspergillus is a common mold that can appear as green, yellow, or gray patches. It often grows on water-damaged drywall, wallpaper, and fabrics. While many people encounter it without issue, some strains can affect those with weakened immune systems or allergies.

Cladosporium is another frequent indoor mold, typically olive-green or brown. It grows on wood, carpets, and painted surfaces where moisture lingers. It is less likely to cause serious health issues but can trigger allergy symptoms like sneezing or itchy eyes.

  • Aspergillus: green, yellow, or gray; found on drywall and fabrics
  • Cladosporium: olive-green or brown; grows on wood and carpets
  • Penicillium: blue-green; often on water-damaged materials
  • Stachybotrys: black mold; needs prolonged moisture
  • Alternaria: dark with velvety texture; common in damp areas
  • Aureobasidium: pink or black; found on grout and wood

Black Mold Concerns

Stachybotrys chartarum, often called black mold, is the type people worry about most. It appears as dark black or greenish-black patches and usually grows on materials with high cellulose, like drywall and paper, after long periods of wetness. Not all black-colored mold is Stachybotrys, and visual identification alone is unreliable.

Black mold can produce mycotoxins, which may cause respiratory irritation, coughing, or headaches in some people. However, health effects vary widely, and many people experience no symptoms. The key is to remove the moisture source and dry the area thoroughly, not to panic over the mold's color.

Why Mold Appears in Homes

Mold needs moisture, warmth, and organic material to grow. Common sources include leaking pipes, roof leaks, poorly sealed windows, and flooding. In warm, humid climates, indoor humidity can also feed mold growth if ventilation is poor.

Even minor leaks behind walls or under floors can create hidden mold. You might notice a musty odor or see discolored spots on drywall. If you suspect hidden growth, a professional inspection can locate the source and assess the extent of the problem.

Health and Safety Basics

Exposure to mold can cause allergic reactions, asthma flare-ups, or other respiratory issues. People with mold allergies, asthma, or weakened immune systems are more sensitive. If you feel unwell after exposure, see a doctor for advice.

When cleaning small areas of mold, wear gloves, goggles, and a mask to avoid inhaling spores. Never mix bleach with ammonia, as that creates toxic fumes. For larger areas or if you have health concerns, contact a mold professional who can handle the cleanup safely.

When to Call the Pros

If mold covers a large area, recurs after cleaning, or appears to be behind walls, professional help is wise. Local water damage pros can perform moisture mapping and structural drying to address the underlying dampness. They can also inspect for hidden leaks that feed mold growth.

The pros use specialized equipment to dry out building materials and reduce humidity, which helps prevent mold from returning. They can also assess whether drywall or flooring needs removal. The cost depends on the extent of the damage, the materials involved, and the size of the affected area.

  • Moisture mapping to find hidden damp spots
  • Structural drying to reduce humidity in walls and floors
  • Leak detection to stop the water source
  • Removal of water-damaged drywall or flooring if needed
  • Advice on preventing future mold growth

Need help right now?

Every hour counts once water gets into floors and walls. One call starts the response.

Call Now (313) 766-2970

Frequently asked questions

Is black mold the most dangerous type?

Black mold can produce toxins, but not all black molds are toxic. Health effects vary by individual. The bigger risk is any mold growth, which can trigger allergies or asthma. Focus on removing moisture and cleaning the area thoroughly.

Can I remove mold myself?

For small patches under a few feet, you can clean with detergent and water, then dry completely. For larger areas or if you have respiratory issues, hire a mold professional. Always wear protective gear and fix the moisture problem first.

How can I prevent mold from coming back?

Control indoor humidity to below 60 percent using dehumidifiers or ventilation. Fix leaks promptly, dry wet areas within 24 to 48 hours, and improve airflow in bathrooms and kitchens. Regular inspection of pipes and roofs helps catch problems early.

Call Now (313) 766-2970