How to Deal With Mold On Drywall & Avoid Extra Damage

Mold on drywall isn’t just an eyesore; it’s a sign of potentially serious problems. Many homeowners dread the discovery of mold in their homes, especially when it becomes apparent on the walls. This fungus not only ruins the aesthetics of your home but poses a risk to your health and can compromise the structure of your property if left unchecked.

This comprehensive guide is designed to assist homeowners in tackling the issue of mold on drywall. We’ll break down the steps to identify, address, and prevent mold growth, ensuring that your home remains a safe and healthy environment for you and your family.

Inside This Blog:

  • Understanding Mold Growth on Drywall
  • Knowing the Type of Mold You’re Dealing With
  • The Correct Steps to Remove Mold on Drywall
  • Repairing and Restoring Your Drywall

Through each section, you will gain actionable insights and expert tips to manage this common household issue effectively.

mold on drywall behind bathroom shelf

Understanding Mold Growth on Drywall

Mold can grow on almost any surface in your home, but drywall is particularly vulnerable. Drywall offers an organic food source and is often located in areas with some level of moisture, creating the perfect environment for mold to thrive.

Typically, mold needs a source of moisture and the right temperature to grow. Drywall that remains damp for over 48 hours can become vulnerable to mold growth. Common factors leading to mold growth on drywall include leaks, floods, condensation, high humidity, and poor ventilation.

Signs of Mold on Drywall

The presence of mold isn’t always evident, especially when it’s behind walls. However, there are some key indicators of mold on drywall, including:

  • A musty smell
  • Discoloration or spots on the walls
  • Peeling or bubbling paint or wallpaper
  • Warped walls or wallpaper
  • Respiratory issues or allergies that seem to worsen indoors

If you notice any of these signs, it’s crucial to investigate the cause and address the mold growth as soon as possible.

How to Identify the Type of Mold

There are many types of mold, some harmless and some toxic. Black mold, or Stachybotrys chartarum, is one of the most notorious and can be harmful if inhaled. It tends to look slimy and dark green or black but may also appear dry and powdery. Other common types of mold found on drywall include Penicillium, Cladosporium, and Aspergillus.

Determining the type of mold is not only important for the cleanup process but also for health reasons. It is always advised to get a professional inspection to identify the type of mold effectively.

Getting a Professional Inspection

Professionals use various methods, such as air sampling and surface testing, to identify mold and its type. This can also help in the source determination, discovering where the moisture problem originates, and providing guidance for an effective remediation plan.

Steps to Remove Mold on Drywall

Once you’ve identified mold on your drywall, it’s crucial to address it with the appropriate steps to mitigate further spread and protect the integrity of your home. Here are the steps:

Safety First

Mold removal can introduce harmful spores into the air, so protective gear is critical. This includes a mask, gloves, and goggles. Ventilate the area well by opening windows and using fans.


Before removing the mold, it’s important to set up your work area and gather the necessary supplies:

  • Plastic sheeting to cover and protect the unaffected areas
  • Duct tape to secure the sheeting
  • An N-95 respirator or better for each person
  • Non-ammonia soap or detergent and hot water
  • Bleach or a commercial mold-killing product
  • Scrub brush or sponge
  • A wet-dry vacuum with a HEPA filter
  • A ladder or step stool, if applicable
  • Garbage bags for moldy materials


  1. Start by sealing off the affected area with plastic sheeting to contain airborne mold spores.
  2. Use the wet-dry vacuum to remove standing water or excess moisture in the area.
  3. Scrub the affected area with the cleaning solution using a brush or sponge. Be thorough but avoid aggressive scrubbing, as it can release mold spores into the air.
  4. Allow the area to dry completely. Use fans and dehumidifiers to expedite the process.
  5. Once dry, inspect the area and re-clean any visible mold growth.
  6. If the affected area is large or the mold growth is extensive, it’s best to contact a professional remediation service.


Mold is likely to return if the moisture source isn’t addressed. Ensure that any leaks are repaired, and proper ventilation is established. After the restoration, monitor the area for any signs of returning moisture or mold.

mold on drywall in ceiling

Repairing Drywall After Mold Removal

Once the mold has been safely removed, you’ll need to repair and restore your drywall to its original state. This is how:

Repairing the Drywall

To repair the drywall affected by mold, follow these steps:

  1. Cut away and replace any sections that are beyond repair and ensure the new drywall is properly secured and sealed to prevent future mold growth.
  2. Use a mold-resistant joint compound to finish the area. Apply and smooth the compound, allowing it to dry completely between layers.
  3. Once the compound is dry, sand the area to a smooth finish.
  4. Wipe down the area to remove dust from sanding, and apply a primer-sealer to the entire surface to prevent any remaining spores from spreading.
  5. Finish by painting the area with mold-resistant paint, if desired.

Painting Over Mold-Affected Areas

Using a mold-resistant paint can be beneficial in areas prone to moisture. These paints contain an added fungicide to discourage the growth of mold.

Preventing Mold Growth in the Future

Mold prevention is key to maintaining a healthy environment in your home. Here are some strategies to keep mold at bay:

  • Regularly inspect for leaks and fix them immediately
  • Ensure proper ventilation in areas such as bathrooms and kitchens
  • Monitor and control indoor humidity levels with the use of dehumidifiers
  • Use mold-resistant products and materials in vulnerable areas
  • Regularly clean and inspect the home’s HVAC system

Let Us Handle Your Moldy Drywall

Dealing with mold on drywall can be a daunting task, but with the proper knowledge and resources, you can address the issue effectively. Remember to act swiftly at the first signs of mold, use the appropriate safety measures, and focus on long-term prevention to protect your home and those who live in it.

For more assistance with killing mold, contact Allphase Roofing. Our experienced team is here to help you safeguard your home against damaging elements.

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