Types of Mold Found in Homes and What Each One Means

Mold spores are everywhere, but they only grow where moisture lingers. The most common indoor types include Cladosporium, which appears as dark green or black spots on wood, drywall, and fabrics. Penicillium shows up as blue or green patches on damp materials, often near leaks. Aspergillus can be yellow, green, or white and grows on dusty surfaces and insulation.

Stachybotrys, often called black mold, is dark green or black and feels slimy. It grows on materials with high cellulose content, like drywall and paper, after prolonged water exposure. While all molds can trigger allergies, Stachybotrys is often linked to more severe respiratory reactions. Identifying the type helps the pros choose the right removal method, but the underlying moisture issue needs fixing regardless.

• Cladosporium: common on wood and fabrics, often dark spots
• Penicillium: blue or green patches on damp materials
• Aspergillus: yellow, green, or white, on dusty surfaces
• Stachybotrys: black and slimy, needs prolonged moisture
• Alternaria: often found in showers and near windows
• Aureobasidium: pink or black, common on grout and caulk

Exposure to mold can cause symptoms like sneezing, coughing, watery eyes, and skin irritation. People with asthma, allergies, or weakened immune systems may react more strongly. If you feel unwell in a moldy area, see a doctor. For most healthy individuals, removing the mold and fixing the moisture problem resolves the issue.

You should not attempt to remove large areas of mold yourself, especially if the growth covers more than a few square feet. Disturbing mold can release spores into the air. The pros use containment and filtration to minimize exposure. For small patches, you can clean with soap and water, but always wear gloves and a mask.

When you find mold, the first step is to stop the water source. That might involve a plumber for a pipe leak or a roofer for a roof issue. Once the leak is fixed, the affected area needs drying and dehumidification. The pros use industrial dehumidifiers to draw moisture out of walls and floors.

After the area is dry, the pros remove moldy materials and clean surfaces. They may apply antimicrobial treatments to prevent regrowth. The goal is to eliminate the mold and the conditions that allowed it. If you live in Sammamish, you can rely on local water damage pros to assess and handle the situation safely.