Why Is Mold Growing Around My Windows?

Mold around a window usually means moisture is repeatedly collecting there. The question is where it comes from.

Condensation

Warm, humid indoor air can condense on a cold window surface. If that happens repeatedly, nearby trim, caulk, or drywall may stay damp.

Leakage

Water can also enter around window openings, exterior flashing, damaged seals, or nearby exterior materials. Don't assume every wet window is condensation.

Check when the moisture appears

Does it show up on cold mornings, during rain, after showers, in humid weather, or all the time? Timing helps separate condensation from water intrusion.

Clean the visible area, but find the cause

Removing surface mold without reducing the recurring moisture won't keep it away.

Look for damage

Soft drywall, swollen trim, peeling paint, or staining may mean the moisture has affected more than the surface.

When should I get help?

Get help when:

• The affected area is extensive.
• Water appears to enter from outside.
• Building materials are damaged.
• Mold keeps returning.
• Moisture is hidden inside the wall.

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