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What To Do When You Have Basement Mould

May 13, 2025

Basement mould isn’t just a cosmetic issue—it’s a serious health risk. It can create unpleasant odours, damage your possessions, and weaken the structural integrity of your home. Whether it’s fuzzy spots on your stored items or black mould creeping up your basement walls, mould requires urgent attention. This guide will help you understand the causes of basement mould, how to detect it, and the best ways to remove it.

Common Causes of Mould in Your Basement

Basement mouldMould thrives in moist environments, and your basement provides ideal conditions. Basements are often damp, cool, and poorly ventilated, creating the perfect breeding ground for mould growth. The absence of sunlight further limits drying and airflow, which accelerates the spread of mould.

Moisture is the root cause of basement mould, and it can come from several sources. Many homeowners overlook these sources, allowing the problem to persist and worsen over time. Below are the common causes of basement mould:

Condensation:

Basements have higher humidity levels, and when cold surfaces meet warm, moist air, condensation forms. This moisture builds up on walls, floors, and pipes, providing the ideal conditions for mould growth.

Flooding:

If your basement floods, water can seep into the structure and remain for days. The prolonged moisture is perfect for mould, especially black mould, which thrives in wet conditions. If your basement floods, contact BEST Plumbing and Drainage for expert basement waterproofing services to prevent further damage.

Leaks:

Leaking pipes, cracks in the walls, and faulty foundations can all introduce unwanted moisture into your basement. Even minor leaks, if left unchecked, can provide enough moisture for mould to take hold. Regular inspections can help identify leaks before they lead to a bigger issue.

How to Detect Mould in Your Basement

basement mouldMould often goes unnoticed until it has spread and caused significant damage. The first sign of mould is usually a musty smell. If you notice a strange odour in your basement, it’s essential to act quickly. Mould releases spores into the air, and those spores can be harmful to your health. If you smell something off, call BEST Plumbing and Drainage right away for a thorough inspection.

Here’s how you can check for mould in your basement:

Look for Moisture:

Mould thrives on moisture, so inspect your basement for leaks, water stains, or wet spots on walls, floors, and ceilings. These are often the first signs of water damage and mould growth.

Inspect Organic Materials:

Mould loves organic materials like wood, carpet, insulation, and drywall. Look for discoloration, fuzzy spots, or stains, which can signal mould growth.

Common places to find mould in your basement include:

  • Walls and wall cavities
  • Wooden framing
  • Floors and ceilings
  • Insulation and storage boxes
  • Furniture and cardboard boxes
  • Pipes, ducts, and vents

How to Prevent Mould from Developing in Your Basement

Preventing mould growth is far easier than removing it. The key to keeping your basement dry and mould-free is managing moisture and humidity. Here are some steps you can take to prevent basement mould:

Fix Leaking Basement Walls:

If you notice water seeping through your basement walls, it’s time to act. Sealants may provide temporary relief, but the best long-term solution is basement waterproofing. Call BEST Plumbing and Drainage, the leading contractor for waterproofing services in London, Ontario.

Control Humidity:

Mould requires moisture to grow, so controlling humidity is crucial. Keep your basement’s humidity levels below 55% by using a dehumidifier or installing proper ventilation.

Regular Cleaning:

Dust and dirt are food sources for mould, so cleaning your basement regularly is a great way to keep the problem at bay. Vacuum your basement weekly and wipe down surfaces to reduce organic matter that mould can feed on.

Manage Your Landscaping:

Water buildup around your foundation can worsen mould problems. If your yard slopes toward your foundation, it can direct water into your basement. Ensure proper grading and install effective drainage systems to keep water away from your home.

How to Safely Remove Mould from Your Basement

Removing mould should be done with caution, especially if the affected area is large. Mould can be hazardous to your health, and disturbing it can release spores into the air. Here’s what you can do for smaller mould problems:

  1. Protect Yourself: Always wear gloves, an N95 respirator mask, and goggles to prevent exposure to harmful mould spores.

  2. Ventilate the Area: Open windows and doors to increase airflow and reduce moisture. This can help prevent mould from spreading to other areas of your home.

  3. Clean the Affected Areas: For small mould problems, clean the affected areas using soap and water. For more stubborn mould, use a mixture of 1 cup of bleach to 1 gallon of water. Never mix bleach with other cleaners.

  4. Dry the Area Thoroughly: Once the mould is removed, ensure the area is completely dry. Any remaining moisture can cause mould to return.

While small mould patches can be dealt with using DIY methods, large-scale mould removal should always be handled by professionals.

Wet Basement Repair and Mould Prevention

Mould removal can be a complex and hazardous task, especially if it covers a large area. Disturbing mould spores can cause them to spread, exacerbating the problem. This is why it’s crucial to address the underlying causes of mould growth, such as excess moisture, to prevent it from returning.

At BEST Plumbing and Drainage, we don’t specialize in mould removal itself but in fixing the underlying issues that lead to mould growth. We specialize in wet basement repair, basement waterproofing, and sealing leaks. Our expert team will identify the root cause of your moisture problem, ensuring that the environment is dried out and protected from further mould growth. With over 50 years of experience and a 20-year warranty, we provide long-term solutions to keep your basement dry and safe.

Prevent Future Mould Growth with BEST Plumbing and Drainage

Dealing with basement mould can be overwhelming, but with the right help, it is manageable. Contact BEST Plumbing and Drainage, the trusted plumbing and drainage contractor in London, Ontario, for expert wet basement repair and waterproofing. Our services address the root causes of moisture and ensure that your basement remains dry, preventing mould growth and water damage. Don’t wait for minor issues to become major problems. Schedule a consultation with our team today to protect your home and family from basement mould and moisture.

Trust BEST Plumbing and Drainage to keep your home safe, dry, and free from mould-related issues. We’ll fix the problem at its source and provide lasting protection.

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