Case Study: Mold on Bathroom Walls

A customer called, worrying about a musty odor in the bathroom.  Her main concern was the safety of the children, especially the one with asthma. She mentioned seeing small amounts of mold on the bathroom walls and wanted us to come out and take a look.  Before we scheduled an appointment, we wanted to ask some questions that may help us understand the issue a little more.

Phone Consultation

  • Is there adequate ventilation in the bathroom?
  • Does the bathroom exhaust work?
  • How often are the air ducts cleaned?
  • Do the outside corners of the tub or shower have water spots, water damage, or mold?
  • Is the sheetrock or wallpaper soft, bubbling, or spongy?
  • Is there mold or stains on the ceiling of the shower?
  • What is located in the space above the bathroom?

After she answered a few more questions, we decided that we could be of some help.  We scheduled an appointment for a Mold Inspection and Mold Testing for the next day. During the mold inspection, we noticed the walls and ceiling of the shower were soft with cracked and loose tiles. With the homeowner's permission, we peeled back some of the wallpaper on the wall and uncovered Mold growing.

Cleaning Mold on Walls with Bleach

Then, the homeowner mentioned that bleach was used to spray the mold.  The mold mold behind wallpaperkept coming back.  Spraying bleach for this instance only killed the mold on the surface.  With constant moisture, Mold thrives off cellulose material like sheetrock, creating an appearance of mold on the surface.  The bleach worked but did not treat the hidden mold within the wall.

Humidity Levels and Moisture Issues Causing Mold

Using a hygrometer, the readings on one wall detected high humidity levels. A very positive indication of mold.  Again with the owner's permission. we were able to look through a small hole in the section of the soft sheetrock and can see mold in the wall cavity.  In this case, we concluded that water was leaking from the shower into the wall cavity causing the Mold growth.

Mold Testing - Indoor Air Quality Test

During the Mold Testing procedure, we took air samples from the bathroom, an adjacent bedroom, and a living room.  When the results arrived the Mold Lab determined that elevated Mold levels were found in both the bathroom and adjacent bedroom.  The bedroom shared a wall with the bathroom.  The living area was tested and did not have elevated levels of Mold, which is a good sign that Mold was confined to the two rooms.

Mold Test Analysis & Results

Based on the Mold Inspection and the Results from the Mold Test, we were able to provide the Homeowner with the guidelines and estimate for Mold Remediation.

Mold911 Tulsa Here to Help Solve Mold Issues

So to answer the question of How do I get rid of black mold on my walls?  It really depends on the situation.

  • Bleach - Read the EPA article, Should I Use Bleach to Cleanup Mold?, Click here.
  • Vinegar - For very small areas of mold on porous materials.
  • Mold911 Pro Treatment - contains no acids, alcohol, amines, ammonia, caustic, chlorine bleach, glycol ethers, phosphates, quaternary ammonium compounds, dyes, or fragrances.  And effective in neutralizing unpleasant odors.

Anything larger than 5' x 5' area, you should call Mold911 Tulsa Mold Remediation Company.  If you have a similar issue or know someone that does, please give us a call at 918-770-4888.