How to detect mold in a shower?

Author: Lloyd Dickinson  |  Last update: Saturday, July 19, 2025

You See Dark Spots Black spots are often the first sign of mold or mildew in the bathroom. These black spots may first show up in your tile grout or the caulk around the shower or tub. Take a look at the floor, around the baseboards, and on the ceiling to spot spores in tricky locations.

How do you know if your shower has mold?

If you notice any of the following signs, you may have black mold in your shower:
  1. You see black mold growing on the walls, floor, or ceiling of your shower.
  2. You smell a musty odor coming from your bathroom.
  3. You have a cough, headache, or other respiratory problems that seem to worsen when you're in the shower.

How to test a shower for mold?

In order to distinguish mold from dirt, you can do a test using household bleach. Pour a few drops of the bleach in the dark spots along the grout lines. If the dark areas lighten after a few minutes, then you certainly have mold.

Can I test for mold in the air myself?

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. In order to test for mold spores yourself without the help of a professional, you should purchase a viable mold test kit. These can range in price from about $20-$45.

What are signs of mold sickness?

Although symptoms can vary, the most common symptoms seen in people exposed to mold indoors include:
  • Nasal and sinus congestion.
  • Eye irritation, such as itchy, red, watery eyes.
  • Wheezing and difficulty breathing.
  • Cough.
  • Throat irritation.
  • Skin irritation, such as a rash.
  • Headache.

How To Test For Mold In Your Home | Best DIY Mold Test Kit to Use | Mold Testing

Can mold behind walls make you sick?

It irritates the nose and throat, which can lead to both sneezing and coughing as your body tries to get rid of the irritant. Inhaling mold spores can also trigger coughing in people with allergies or an asthma attack, for those with asthma.

How to test yourself for mold exposure?

There are several methods available to test for mold exposure:
  1. Blood Tests: Blood tests for mold exposure detect specific antibodies produced by the immune system in response to mold exposure. ...
  2. Skin Prick Tests: This method involves exposing the skin to small amounts of common molds to check for allergic reactions.

How to tell if mold is behind walls?

How to Detect Mold in Walls
  1. Water stains.
  2. Dark rings.
  3. Discoloration.
  4. Deterioration like peeling, bubbling, or cracking of the paint or wallpaper.

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.

Will air purifiers help with mold?

Mold is an obvious health risk in any home, but investing in an air purifier can help limit your exposure. The best among them will ideally offer HEPA-level filtration, with this level of filtration being able to trap up to 99.97% of airborne particles down to 0.3 microns in diameter.

How to treat mold behind shower walls?

Clean up and remediation
  1. Setup containment. (HEPA air scrubber, negative pressure, etc.)
  2. Remove shower surround.
  3. Remove tile backer board if present.
  4. If necessary, remove tub or shower pan.
  5. Clean underlying framing and flooring.
  6. If dry rot is present, remove and replace damaged framing.
  7. Address plumbing problem.

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.

What kills mold in shower grout?

Spray the affected grout with oxygen bleach, chlorine bleach, or hydrogen peroxide, ensuring the solution saturates the stains. Let it dwell for several minutes, then scrub the area. A second application may be necessary for persistent stains.

What if I smell mold in my bathroom but can't see it?

Call for professional help: If you are unable to find the source of the mold smell or suspect a more severe mold infestation, it may be time to call a mold remediation specialist. These professionals can conduct mold testing, identify the source of the mold, and safely remove it from your home.

What spray kills black mold?

Treat the Area. For a natural solution to getting rid of black mold, combine one part baking soda with five parts distilled white vinegar and five parts water in a spray bottle. Alternatively, you can use a chemical-based mold and mildew remover, all-purpose cleaners, bleach or dish soap.

What do professionals use to detect mold?

It's best to hire a professional mold inspector for accurate results. They have the experience and equipment such as digital moisture meters, hygrometers, infrared cameras, and borescopes, to detect and identify mold growth, and DIY kits may be unreliable.

Is there an app that can detect mold?

Mold Finder AI makes mold inspection fast, easy, and reliable. Whether you're concerned about black mold or any other mold issue, our advanced AI technology will help you detect and analyze mold in seconds. Simply snap a photo or upload one from your gallery, and Mold Finder AI will do the rest!

What are symptoms of black mold exposure?

The most common symptoms of black mold exposure include:
  • Sneezing.
  • Coughing.
  • Nasal congestion.
  • Postnasal drip.
  • Red eyes.

How to detect hidden mold?

Mold can hide behind walls and ceilings, making it challenging to detect with the naked eye. An infrared camera or thermal imager detects temperature variations, revealing hidden pockets of moisture. Use it to scan walls for potential water damage, as mold often follows dampness.

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 remove mold from behind 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.

Is there a DIY test for mold?

The Do It Yourself Mold Test Kit can be used for indoor or outdoor mold testing. Tests indoor air quality for unseen mold in the home. There are three testing methods: (1) Indoor Air Quality Test Method (2) Air Conditioning & Heating Sample Method (3) Surface Sampling Testing Method (when visible mold is present).

How long does it take to get sick from mold exposure?

According to the CDC, people usually experience their first symptoms within 2 to 9 hours of their first exposure. On the other hand, some people could go for weeks or months before feeling sick if their exposure is limited enough. This is why it is also important to check damp, dark areas of your home for mold.

What is the fastest way to test for mold?

Buy a Mold Test Kit

You can buy DIY mold test kits online and in most home-improvement stores. They typically come with a Petri dish that collects spores from the air, and are most effective when placed in areas that are most likely to have moisture, like bathrooms, kitchens and basements, says Miciano.

Previous article
Can I use Vaseline instead of WD-40?
Next article
What oil does Popeyes fry their chicken in?