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Why Is There Mold in My Garage?

Last updated October 25, 2026

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The short answer

Find the Moisture Source

Mold needs water to grow, so your first step is to find where the moisture comes from. Check the roof for missing shingles or gaps, look at the walls for cracks, and inspect the floor for damp spots. A leaky pipe or a high water table can also keep the concrete wet.

In a humid continental climate, warm summer air can bring moisture into a cool garage. If the garage is attached to your home, humid air from the house can also enter. Walk around and look for any sign of water, from a small drip to a puddle after rain.

Look at Ventilation and Airflow

Poor airflow lets moisture hang around and gives mold a chance to settle. Garages often have no windows or vents, so the air stays still. Open the garage door on dry days and use a fan to keep air moving, which helps surfaces dry out.

If you store damp items like garden tools or a car that just came in from the rain, they add moisture to the air. Move wet things out or let them dry before storing. A dehumidifier can also pull moisture from the air, especially in the summer months.

  • Open the garage door on dry, breezy days
  • Use a fan to circulate air near corners and walls
  • Keep damp items out or dry them before storing
  • Run a dehumidifier in humid weather
  • Seal gaps around windows and doors
  • Clean gutters and downspouts to direct water away

Check for Hidden Water Damage

Mold can grow behind stored boxes, on drywall, or under a workbench where you cannot see it. Look for dark spots, a musty smell, or warped wood. These clues tell you that moisture has been sitting there for a while.

If you find water damage on drywall or flooring, that material may need to be removed and replaced. The pros who handle water damage can also use moisture meters to find damp areas that are not visible. Catching the problem early keeps it from spreading.

Clean Small Areas Safely

For a small patch of mold, you can clean it with soap and water or a store-bought mold cleaner. Wear gloves and a mask so you do not breathe in spores. Scrub the surface, then dry it completely. If the mold comes back, the moisture source is still there.

Never mix bleach with other cleaners, and open the garage door for fresh air while you work. If you feel unwell, see a doctor. For larger areas, more than a few square feet, it is safer to let the pros handle it, because disturbing mold can send spores into the air.

When to Call the Pros

If the mold covers a large area or keeps returning, local water damage pros can help. They have tools to dry out the garage and find hidden moisture. They can also remove and replace damaged drywall or flooring. Their work usually involves drying, cleaning, and repairing the affected materials.

Before any major work, check your insurance policy. Policies vary, and your insurer decides what is covered. If you live in Detroit, keep a list of any water damage and what you did to fix it. That record can help if you need to file a claim.

Talk to someone now

Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

Is mold in the garage dangerous?

Mold can cause health issues, especially for people with allergies or asthma. You might notice sneezing, coughing, or itchy eyes. If you feel unwell, see a doctor. For large areas, the pros can remove mold safely and reduce the risk of exposure.

Can I just paint over mold?

Painting over mold does not kill it, and the mold can show through again. You need to clean the surface and fix the moisture problem first. If the drywall is soaked, it may need to be cut out and replaced. Otherwise, the mold will likely come back.

How do I keep mold from coming back?

Keep the garage dry and well-ventilated. Fix any leaks in the roof, walls, or pipes right away. Use a dehumidifier in humid months and wipe up any standing water quickly. Store items off the floor so air can circulate underneath.

Call Now (313) 766-2970