How to test for mold behind walls?

Author: Anya Metz  |  Last update: Friday, December 5, 2025

To tell if mold is inside your walls, professionals will take samples from the affected area through a swab test, bulk sampling (taking a piece of your drywall), and/or air test. After sample collection, they will take the samples to a laboratory for testing.

Is there a way to detect mold behind a wall?

Musty Smell

If you think there's mold in your walls, get on your hands and knees and smell the electrical outlets. This might sound silly, but it may help you sense mold if it's growing within walls. Outlets have better access to the area behind the walls. Thus, smelling them can help identify the mold problem.

Can mold behind drywall affect you?

Mold behind drywall can be dangerous to some people with allergies and breathing issues it can be very dangerous. Not all mold is bad but in homes especially if a leak was present or any moisture bad mold can grow. Lowes and home depot sell mold t...

How do I test my house for hidden mold?

Home testing kits are typically petrie dishes that you place in a location where you suspect harmful mold might be growing. The dish is meant to collect spores over the course of 24 to 48 hours and then grow the spores into mold, which is then evaluated by a lab or visually inspected.

What are the symptoms of mold in the walls?

You can usually see or smell a mold problem. Mold can appear as slightly fuzzy, discolored, or slimy patches that increase in size as they grow. Most molds produce musty odors that are the first indication of a problem. Mold can grow anywhere there is adequate moisture or a water problem.

Early Stage Mould Inspection Tips from a Mold Inspector

What are the 10 warning signs of mold toxicity?

However, some common signs that may indicate mold exposure include: Coughing, wheezing, shortness of breath, nasal congestion, and frequent sinus infections. Rashes, itching, burning sensations, and persistent skin irritation.

How to get rid of mold inside walls?

How to Remove Mold from Inside Walls
  1. Contain Your Work Area. Before you start work, protect the other areas of your home. ...
  2. Remove the Affected Drywall. ...
  3. Remove the Insulation. ...
  4. Dry Out the Area. ...
  5. Vacuum the Space. ...
  6. Kill the Mold. ...
  7. Contain and Encapsulate the Mold. ...
  8. Close and Rebuild the Wall.

Can I do a mold test myself?

Mold testing kits are available at most home improvement stores or online retailers, although not all tests are the same. There are some kits that only test for the presence of mold on surfaces, while others collect or grow samples of the mold that may be in your home.

Does homeowners insurance cover mold?

Homeowners insurance doesn't usually cover mold damage or removal unless it's the result of a covered peril. If the mold in your residence was caused by something sudden or accidental, such as a bursting pipe or some other covered incident on your policy, you may be protected.

How to tell if mold is making you sick?

Signs and symptoms of allergic rhinitis caused by a mold allergy can include:
  • Sneezing.
  • Runny or stuffy nose.
  • Cough and postnasal drip.
  • Itchy eyes, nose and throat.
  • Watery eyes.
  • Dry, scaly skin.

How much does a mold inspection cost?

In his California market, the cost can range from $275 for a simple visit to $2,900 for a complex inspection. For homes under 4,000 square feet, Angi estimates the average cost is generally between $300 and $400, whereas larger homes may see prices between $700 and $1,000.

Can mould behind walls make you sick?

The respiratory effects of damp and mould can cause serious illness and, in the most severe cases, death. The respiratory effects include: general symptoms such as cough, wheeze and shortness of breath. increased risk of airway infections, including aspergillosis (an infection of the airways with the fungus Aspergillus ...

Can mold grow behind shower walls?

Mold issues in the shower surround can be broken into two broad categories – surface mold growth and mold behind the surround. Surface mold growth is unsightly and can be difficult to remove. However, it's the moisture hidden in the framing behind the shower that can lead to structural damage and expensive repairs.

Is there a device that detects mold?

Mold Detection

In the same way that smoke detectors identify smoke, not fire, the Biomatrix Mold Monitor identifies unseen moisture that can lead to widespread mold growth.

How to detect moisture behind drywall?

Moisture within and behind walls can be detected with a pinless moisture meter. A non-destructive moisture meter can accurately locate and measure elevated moisture levels without the need to break the wall's surface material.

How do I permanently get rid of mold in my house?

Spray the area with a mixture of water and vinegar - half water, half vinegar. Next, scrub to remove all traces of the mold. For removal of black and white mold, spray the area with the half water and half vinegar solution.

How expensive is mold removal?

Most mold removal professionals charge around $10 to $25 per square foot. So, if you're removing mold from a 100-square-foot area, you can expect to pay around $1,000 to $2,500. But factors like where the growth is and the mold type can affect how much it costs to remove it.

How to get a mold inspection?

Look for a contractor with specific experience and expertise in mold inspections and remediation. Ask them how many mold remediations they've done in the last six months. Call around your area and get a few estimates. There might be a wide price range, so shopping around could save you a few hundred dollars.

Who pays for mold remediation?

If there is a covered condition that the homeowner's insurance policy covers that causes mold, then the insurance company will cover mold remediation. Excess water from a natural cause like a roof leaking after a rain storm is usually covered by a homeowners insurance policy.

How to tell if mold is behind walls?

How Do I Detect Mold Inside My Walls and Drywall? Peeling wallpaper can also be a symptom of mold. While some scruffiness and discoloration tend to eventually strike your wallpaper, unusual surface or peeling abnormalities such as crackling or bubbling can be a sign of wall moisture.

Are home mold tests worth it?

Mold testing can provide valuable information, but it has limitations. In many cases, visible mold growth is sufficient evidence of a problem, and testing may not provide additional actionable information. The Environmental Protection Agency (EPA) suggests that if you have visible mold, testing is usually unnecessary.

How do you test for mold if you can't see it?

Smell Test: Mold often produces a musty, damp smell. If you notice any unusual odors in the basement, it might be a sign of hidden mold. Moisture Meters: You can use a moisture meter to check for moisture in the walls. High moisture levels can be an indicator of a potential mold issue.

What are signs of mold sickness?

One of the most common warning signs of mold toxicity is persistent respiratory issues such as coughing, sneezing, and difficulty breathing. If you or your family members experience these symptoms, especially when at home, it could be a sign of mold presence.

What kills 100% of mold?

Hydrogen peroxide, commonly used to disinfect wounds, is active against a wide variety of micro-organisms including mold. It acts by releasing oxygen at a rapid rate, which kills mold by oxidizing the surface and breaking down proteins and DNA.

Can mold be removed without removing drywall?

If you find mold on your drywall, you'll most likely need to get it replaced. Mold on drywall can indicate a deeper problem in the stud space behind your wall since it can penetrate the surface. In this case, you'll need to cut it out and replace the drywall in the affected and surrounding areas.

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