How Do I Know If I Have Mold in My Walls?

Check your walls for black, green, or brown spots that spread or darken over time. Mold often appears near baseboards, corners, or around windows where moisture collects. You might also see bubbling or peeling paint, which can mean moisture is trapped behind the surface. Pay special attention to areas behind furniture, since poor air circulation there can encourage mold growth.

A musty, earthy smell is another strong clue, even if you cannot see anything. The odor tends to be strongest near the affected wall. If you notice both discoloration and a smell, mold is likely present. Sometimes the smell is the only warning you get, so trust your nose.

• Dark spots that grow or change color
• Peeling, bubbling, or cracking paint
• Warped or bulging drywall
• A musty or damp odor
• Water stains or streaks on walls
• Recent or ongoing moisture issues

Mold needs moisture to grow, so find the source first. Look for leaking pipes, a dripping roof, or condensation from poor ventilation. In coastal areas, wet winters and dry summers can lead to moisture problems in older homes. Also check your gutters and downspouts, since blocked ones can send water into your walls.

If you find a leak, fix it before addressing the mold. Otherwise, the mold will return. A local water damage pro can help locate hidden leaks and assess the extent of the damage. They can also advise you on the right way to dry out the area.

• Inspect under sinks and around toilets
• Check window frames for condensation
• Look for water stains on ceilings
• Feel walls for dampness
• Listen for dripping sounds

Mold exposure can cause sneezing, coughing, or itchy eyes. If you feel unwell and suspect mold, see a doctor. Keep children and anyone with asthma or allergies away from affected areas until the mold is handled. Some people are more sensitive than others, so watch for symptoms in everyone at home.

Do not disturb moldy drywall or insulation without protection. Wear gloves and a mask if you must touch it. For larger problems, let the pros handle the removal safely. They have the right equipment and know how to contain the mold so it does not spread.