The short answer
Start with Your Senses
Your nose is a strong tool for finding hidden mold. Walk through each room and pause to notice any musty, earthy smell. That odor often means mold is growing behind walls, under flooring, or in air ducts. Trust that smell even if you cannot see anything yet.
Next, use your eyes. Look for discolored patches on walls, ceilings, or baseboards. Check for bubbling paint, warped wood, or stains that keep returning. These signs point to moisture problems that mold loves. In humid climates, regular checks are especially worthwhile.
- Musty odors in closets or under sinks
- Dark spots on drywall or ceiling tiles
- Peeling or bubbling paint on walls
- Warped or buckling wood floors
- Stains that reappear after cleaning
- Condensation on windows or pipes
Inspect Moisture Prone Areas
Mold hides where water collects. Look behind the washing machine, under the kitchen sink, and around the water heater. Inspect the attic for roof leaks and check the crawlspace for damp soil or standing water. Pay special attention to the AC unit and its drain line, as these often cause hidden moisture.
Use a flashlight to peer into dark corners and behind large appliances. Move furniture away from walls and check for dampness. Feel the walls with your hand for any cool or wet areas. If you find a leak, fix it quickly to stop mold from spreading.
- Behind the refrigerator and dishwasher
- Under bathroom and kitchen sinks
- Around the toilet base and shower
- In the attic near roof vents
- Along walls and floor joints in the crawlspace
- Inside the AC drip pan and drain line
Use Simple Testing Tools
A moisture meter helps detect dampness in walls and floors. You can buy one at a hardware store and use it to scan suspicious areas. Readings above 20 percent suggest moisture that could support mold. A hygrometer measures humidity in the air; keep indoor levels below 60 percent.
You can also use a flashlight at a low angle to spot fine mold growth on surfaces. Shine it across walls and floors to reveal patches you might miss. For areas you cannot see, a small borescope camera can inspect inside wall cavities. These tools give you a clearer picture without tearing anything open.
Know the Warning Signs
Certain clues point to hidden mold even when you see no growth. Allergies that worsen indoors, like sneezing or itchy eyes, can be a sign. So can headaches, fatigue, or a stuffy nose that clears when you leave home. If you feel unwell, see a doctor.
Also watch for recent water damage. A past leak, flood, or overflow can leave mold behind even after surfaces look dry. If you had water damage and never dried everything fully, mold may be growing inside walls or under floors. That is why a professional inspection is often wise after any water event.
When to Call the Pros
If you find visible mold or a persistent musty smell, call local water damage pros. They have moisture meters, thermal cameras, and experience to locate hidden growth. A water damage inspection can reveal the source of moisture and the extent of mold. They can also check areas you cannot reach safely, like inside ductwork.
The pros can also help if you suspect mold after a leak but find nothing. They will test moisture levels and check behind walls. If they find mold, they can contain the area and remove it properly. Acting quickly reduces damage and protects your health.
Water damage does not wait
Phones are answered 24/7 for Daytona Beach and nearby communities.
Call Now (386) 272-5697Frequently asked questions
Can I test for mold myself?
Home test kits are available, but they are not always reliable. They may miss hidden mold or give unclear results. A professional inspection uses specialized tools to find the source of moisture and mold growth, which gives you a more accurate picture of the problem.
How do I know if mold is behind drywall?
Look for water stains, bubbling paint, or a musty smell near walls. You can also tap the wall; a hollow sound may mean moisture damage. If you suspect mold behind drywall, a pro can use a moisture meter or borescope to check without cutting large holes.
What should I do if I find mold?
Do not touch it with bare hands. Seal off the area to prevent spores from spreading. Turn off your HVAC system to avoid circulating air. Then call the pros to inspect and remove the mold safely, especially if the patch is larger than a few square feet.