How Do I Find the Source of Moisture in My House?

If mold, stains, or musty odors keep returning, cleaning the visible area isn't enough. You need to find where the water or humidity is coming from.

Start above the problem

Water often moves downward. A ceiling stain may come from roof leakage, plumbing above, HVAC equipment, or another water source.

Check plumbing

Look around sinks, toilets, tubs, showers, water heaters, appliances, and visible supply lines.

Think about condensation

Moisture can come from humid air condensing on cold surfaces. Windows, ducts, and other cool surfaces reveal condensation problems.

Look outside

Exterior drainage, roofing, windows, and siding all contribute to water intrusion. Inspect from safe locations.

Pay attention to timing

Does moisture appear during rain, after someone showers, when the AC runs, when an appliance operates, or constantly? Timing is one of the best clues.

When should I get help?

Get help when:

• The source remains hidden.
• Moisture is inside walls or ceilings.
• The affected area is growing.
• Structural materials are deteriorating.
• Significant mold is present.

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