The Three Essentials for Mold Growth in Your Home

Mold requires three key elements to thrive: spores, moisture, and a food source. This page will explain each of the components and what causes mold to grow in the first place.

Hidden leaks are one of the most common culprits for the growth of mold

The Three things mold needs to grow

1. Mold Spores

Mold spores are microscopic particles that are virtually everywhere—in the air we breathe, on surfaces, and in household dust. According to the U.S. Environmental Protection Agency (EPA), it's impossible to eliminate all mold spores indoors; they are a natural part of the environment.  These spores can remain dormant for extended periods, waiting for the right conditions to activate and grow.US EPA

2. Moisture

While spores are always present, they require moisture to begin growing. Moisture can originate from various sources, such as leaks in roofs or pipes, condensation from high humidity, or flooding. The EPA emphasizes that mold will not grow if moisture is not present.  Therefore, controlling indoor moisture is a critical step in preventing mold growth.Office of Environmental Health & Safety+1US EPA+1US EPA

3. A Food Source

Mold feeds on organic materials, many of which are found in typical building components. This includes wood, drywall, wallpaper, carpet, and even dust containing skin cells or pet dander. The EPA notes that mold can grow on virtually any organic substance, making many areas in a home susceptible if moisture is present. US EPA

Where does mold typically grow?

Mold often grows in hidden areas such as behind walls, under floors, or within HVAC systems. These concealed spaces can harbor mold colonies that go unnoticed until they cause significant damage or health issues. Given that mold spores are invisible and mold can grow in hidden areas, detecting mold isn't always straightforward.

When you should test for mold

If you've experienced water damage, notice a musty odor, or have unexplained health symptoms, testing for mold is a good first step. You can learn more about how we test on the blog post "How we test for mold" or schedule a mold test below.

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