The short answer
Find the Moisture Source First
Mold needs moisture to grow, so cleaning the wall without fixing the leak or humidity problem means the mold will return. Check for plumbing leaks, foundation cracks, or poor drainage around your home. In a basement, high humidity from inadequate ventilation is also a common culprit.
In a semi-arid climate with cold snowy winters and hot dry summers, basement moisture often comes from condensation on cold walls during summer or from snowmelt seeping through the foundation in spring. Address these issues before you start cleaning. If you live in Orem, pay attention to the seasonal shifts in your basement's dampness.
Gather Your Cleaning Supplies
You'll need protective gear: rubber gloves, safety goggles, and an N95 respirator mask to avoid inhaling mold spores. For cleaning solution, a mixture of one part dish soap to ten parts water works for many surfaces. For non-porous walls like concrete or tile, a solution of one part white vinegar to three parts water is also effective.
Avoid using bleach on porous surfaces, as it can damage them and may not penetrate deep enough to kill mold roots. You'll also need scrub brushes, clean rags, a spray bottle, and a bucket. If the mold covers more than a small patch, consider calling the pros for a thorough and safe cleanup.
For large areas or if you have health concerns, the pros have industrial-grade equipment and protective gear. They can also test the air quality to ensure the mold is fully addressed.
- Rubber gloves and safety goggles
- N95 respirator mask
- Dish soap or white vinegar
- Scrub brush and rags
- Spray bottle and bucket
- Plastic sheeting to isolate the area
Clean the Wall Step by Step
Start by opening a window or using a fan to ventilate the area, but avoid blowing air into other parts of the house. Seal off the doorway with plastic sheeting to prevent spores from spreading. Spray the cleaning solution onto the moldy area and let it sit for a few minutes to loosen the mold.
Scrub the wall firmly with a brush, working from top to bottom. Wipe away the loosened mold with a rag, and rinse the area with clean water. Dry the wall completely using a dehumidifier or fans, as moisture left behind can encourage new mold growth.
For porous surfaces like drywall or wood, scrubbing may not be enough. If the mold has soaked into the material, you may need to cut out and replace the affected sections. This is often necessary for drywall, which can harbor mold deep within.
When to Call the Pros
If the moldy area is larger than about 10 square feet, or if the mold keeps coming back after cleaning, it's time to get professional help. The pros have the right equipment to remove mold safely and to dry out the structure thoroughly. They can also identify hidden moisture sources that you might miss.
In addition to cleaning, the pros can provide structural drying and dehumidification to prevent future mold growth. They can also help with deeper damage like rotted wood or contaminated insulation. If you have health issues like asthma or allergies, consider calling the pros even for small patches.
The cost of professional mold cleanup depends on the extent of the damage, the type of materials affected, and the size of the area. It often ranges from a few hundred to several thousand dollars, but the exact price depends on your specific situation.
- Mold covers more than 10 square feet
- Mold returns after cleaning
- You have respiratory issues or allergies
- The wall is made of porous material like drywall
- You suspect hidden moisture behind the wall
Prevent Mold from Coming Back
After cleaning, keep your basement dry by using a dehumidifier, especially in the summer months. Fix any leaks promptly, and improve ventilation by opening windows or using exhaust fans. Make sure gutters and downspouts direct water away from your foundation.
Check your basement regularly for signs of moisture, such as condensation on pipes, musty odors, or new stains. If you notice mold starting to grow, clean it early before it spreads. For ongoing issues, consider a water damage inspection to catch problems early.
Policies vary, and your insurer decides what is covered. If mold damage is extensive, check your policy to see if it covers water damage and mold remediation. Some policies may cover the underlying water damage but not the mold itself.
Water damage does not wait
Phones are answered 24/7 for Orem and nearby communities.
Call Now (801) 876-1119Frequently asked questions
Can I use bleach to kill mold on a basement wall?
Bleach can work on non-porous surfaces like tile or concrete, but it may not penetrate porous materials like drywall or wood. Vinegar or a mild detergent is often safer and more effective. Always test a small area first and wear protective gear.
How long does it take for mold to grow after a basement flood?
Mold can begin to grow within 24 to 48 hours after water exposure. That's why it's important to dry out the basement quickly after a flood. Use fans, dehumidifiers, and remove wet materials to prevent mold from taking hold.
Is it safe to stay in the house while cleaning mold?
For small areas, it's usually safe if you wear proper protection and ventilate the space. For larger infestations, it's sensible to leave the house during cleanup to avoid breathing in spores. If you feel unwell, see a doctor.