How to check for mold behind shower walls?

Author: Dejuan Kihn  |  Last update: Friday, May 1, 2026

Signs of Mold Behind Bathroom Tile These may include: A persistent damp or musty smell in your bathroom, even after cleaning, could be a sign of mold hiding behind your tiles. Discoloration, like dark spots or stains around grout lines or on the tiles themselves, may indicate mold growth beneath the surface.

How to tell if there's mold behind shower walls?

Visual signs of mold attacks on the bathroom wall include discoloration, peeling wallpaper and crumbling plaster. Mold often grows behind wall tiles, causing these materials to crack or become loose. Plus, gaps in the grout or caulk suggest mold spores have infiltrated the spaces behind the wall.

Is there a way to detect mold behind walls?

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.

What are the symptoms of shower mold exposure?

Symptoms of mold exposure include cough, sore throat, sneezing, headaches, watery eyes, fatigue, dizziness, inability to think straight or concentrate and thrush on the mucous membranes of your body due to having a compromised immune system. Prolong mold exposures can kill you!

How to get rid of mold behind shower walls?

You can use products like bleach, borax, vinegar, hydrogen peroxide, baking soda, etc. Spray or apply it to the mold. Wait for 10-15 minutes and wipe with a rag or scrub appropriately. However, if the mold spread over a larger area, it's always better to call in a professional.

Early Stage Mould Inspection Tips from a Mold Inspector

Why is there black stuff behind my shower wall?

Bathrooms, with their high humidity levels and often inadequate ventilation, are prime breeding grounds for black mold. The constant presence of moisture from showers, baths, and sinks, along with a lack of sunlight, creates an ideal environment for this mold to grow and spread.

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 do you test for mold in the shower?

Checking if It Is Mold or Dirt/Dust
  1. Dip a clean cotton swab into a diluted bleach solution and dab it on your wall. If the area brightens after a while, it is mold. ...
  2. It is mold if you smell something earthy, damp, or musty. ...
  3. If you can wipe the spots off easily, they're just dust particles.

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 tell if your house is toxic?

If you suspect your asthma worsens or is more severe than usual, contact your doctor or medical professional.
  1. Bad Smells In The Home. When there's a bad smell in the home, you can tell. ...
  2. Peeling Wallpaper. ...
  3. Spots On The Wall. ...
  4. Bad Allergies Won't Go Away. ...
  5. Visible Mold Growth. ...
  6. Past Water Damage.

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.

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.

Can I test myself for mold exposure?

Urine mycotoxin tests are ideal for testing yourself (and your family members) for mycotoxin exposure. They're absolutely painless, totally non-invasive, and incredibly easy to use.

How to test for mold behind walls?

To actually find out if there is mold growing in a wall cavity, a laboratory sample is needed. The least invasive way of collecting a sample inside a wall cavity is to take a wall-check sample. A wall-check is an air sample that is collected directly from inside the wall cavity.

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 to do if you smell mold but can't find it?

When a homeowner smells mold but visual clues are invisible to the naked eye, then mold testing can be performed by a professional to locate the colonies. A mold testing kit can also be inexpensively purchased from the local hardware store and utilized by the homeowner.

How to tell if mold is behind the shower wall?

If the shower becomes slimy, that is also an indicator that mold might be growing behind the tiles. You should also pay attention to any chipping paint, wall discoloration, or plaster damage.

What are the 10 warning signs of mold toxicity?

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 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.

How common is mold in shower?

Mold is especially common in bathrooms that don't have fans or windows. Stagnant air is more likely to let mold or mildew grow, especially after a shower when the damp air settles on surfaces. Opening a window or turning on an exhaust fan can help prevent spores from making your bathroom home.

Is there an air test for mold?

In any areas of a house suspected or confirmed to have mold growth, air samples can be taken to help verify and gather more information. Moisture intrusion, water damage, musty odors, apparent mold growth, or conditions conducive to mold growth are all common reasons to gather an air sample.

What does black shower mold look like?

While it's very dark, it's not a single color, as the name implies. Instead, black mold is actually very dark green, brown, or black and is wet, shiny, and slimy. Black mold often looks fuzzy. It tends to form clusters of circular spots that may have fuzzy white edges and when wiped, leaves a green stain behind.

Can a person live in a house with black mold?

Is it okay to be in house with black mold? Black mold can cause health problems. As such, it is not advisable to be in a house with black mold. If a person must stay in a house with black mold, they should try to seal off any areas where black mold is present to reduce contact with it.

How long does it take to get sick from black 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 does a mold cough sound like?

The cough is typically dry and non-productive, meaning it doesn't bring up mucus. It is sometimes described as having a "barking" or "hacking" sound.

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