Hidden water leak behind a wall

Hidden Leaks That Cause Mold

Slow leaks create long term moisture that feeds mold behind walls and under floors.

Where Leaks Hide

Behind showers and tubs where seals fail
Inside walls around supply lines and drain pipes
Under sinks and cabinets
Beneath windows with failed flashing
Around HVAC condensate lines

Warning Signs

Musty odors without visible growth
Peeling paint or bubbling drywall
Soft or swollen baseboards
Recurring stains that reappear after cleaning

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4 more warning signs

How to Confirm

1

Use a moisture meter

Scan walls and floors near suspected areas.
2

Check adjacent rooms

Leaks often spread beyond the visible stain.
3

Review plumbing history

Look for recent repairs or recurring clogs.

Common Fixes

Replace failed caulk and grout lines
Repair supply lines and shutoff valves
Re-seal window flashing and trim
Address HVAC condensate drainage

Drying Window

Moisture control is the key to preventing mold. Guidance from public health agencies emphasizes drying wet materials quickly.

Stop the leak at the source first
Dry affected materials within 24 to 48 hours
Remove porous materials that stay saturated
Confirm moisture levels before closing walls

Prevention Steps