Dirty or clogged gutters don’t just affect your roof and foundation—they can also create the perfect environment for mold and mildew. Left unchecked, moisture buildup from overflowing gutters can lead to costly health and structural problems.

Knowing how to recognize the early signs can help protect your home and your family.

1. Musty Odors Around Your Home

One of the first signs of mold is a persistent musty smell, especially near ceilings, walls, or basements.

• If the odor lingers even after cleaning, mold may be growing inside your walls or under insulation.

• Areas closest to where the gutters overflow are usually the most affected.

2. Discoloration on Walls or Ceilings

Watch for any dark spots, green patches, or water stains, especially near the corners of your interior or exterior walls.

• Black or green spots are common indicators of mold growth.

• Yellowish-brown water stains may point to trapped moisture from gutter overflow.

3. Peeling Paint or Wallpaper

If your interior paint or wallpaper is peeling without a clear reason, moisture could be trapped behind your walls.

• Moisture from clogged gutters can seep into the structure.

• Repeated dampness causes bubbling, flaking, or warping on interior surfaces.

4. Wet or Soft Drywall

If your drywall feels soft, damp, or crumbly, you may already have mold forming inside.

• Test by gently pressing on suspicious areas.

• Immediate inspection is recommended to prevent further spread.

5. Exterior Mold on Siding or Fascia Boards

Overflowing gutters often result in excess moisture running down your siding or collecting around fascia boards.

• Look for mildew streaks or dark buildup around gutters.

• Wood components may also begin to rot from constant moisture.

Preventative Tip: Regular Gutter Maintenance

The best way to avoid mold from dirty gutters is through regular cleaning and maintenance.

• Clean your gutters at least twice a year—or more if you have surrounding trees.

• Consider gutter guards to reduce debris buildup.

• Schedule a professional gutter inspection to spot potential issues early.