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Remediation 101: Everything You Need to Know About Mould Removal

Wondering about mould? Here’s the 411 on mould removal from your friendly neighbourhood restoration expert.

Remediation 101: Everything You Need to Know About Mould RemovalMould is a common issue in both residential and commercial settings across Canada. It can cause significant damage to property and pose serious health risks if not addressed promptly. This comprehensive guide will cover everything you need to know about mould removal, from identifying the types of mould to understanding the signs of mould presence and exploring removal options.

Section 1: Types of Mould Found in Residential and Commercial Settings

Mould can appear in various forms, each with unique characteristics and health implications. In Canada, the following types of mould are commonly found in homes and commercial buildings:

Common Types of Mould


Cladosporium is a common mould that can impact your health. It may cause allergies and asthma in some individuals and, in very rare cases, can lead to infections. However, most species of Cladosporium are not harmful to humans.

Appearance: Black, green, or brown spots

Where Found: Indoor and outdoor surfaces, including wood, carpets, and fabrics

Health Concerns: Can cause allergic reactions, asthma attacks, and respiratory issues


This type of mould, commonly found in spoiled food, can trigger allergic reactions in individuals sensitive to mould when they inhale Penicillium spores.

 Appearance: Blue, white or green with a velvety texture

Where Found: Water-damaged materials, wallpaper, insulation, and carpeting

Health Concerns: Can lead to allergic reactions and lung inflammation


Aspergillus, the mould responsible for triggering illnesses, is ubiquitous, found both indoors and outdoors. While most strains are harmless, a few can cause serious health issues when inhaled by individuals with weakened immune systems, underlying lung disease, or asthma.

Appearance: Various colours, including white, yellow, or green

Where Found: Indoor air, dust, and damp materials

Health Concerns: Can cause severe allergic reactions and infections, particularly in immunocompromised individuals

Stachybotrys (Black Mould)

Probably the most well-known type of “toxic” mould, it is fortunately the least commonly found in households.

 Appearance: Black or dark green slimy spots

Where Found: Water-damaged areas, especially with high cellulose content like paper, drywall, and wood

Health Concerns: Produces mycotoxins that can lead to severe respiratory issues, chronic fatigue, and neurological problems

When Should You Be Worried?

You should be concerned about mould presence if you notice:

  • Persistent musty odours
  • Discoloration on walls, ceilings, or floors
  • Increased allergy symptoms or respiratory issues among occupants

Immediate action is necessary when mould is visible, spreading, or causing health problems.

Section 2: Signs of Mould

Why Does Mould Appear?

Mould can grow anywhere in your house that provides the right conditions. The most likely places for mould growth include:

  • Locations that have experienced flooding
  • Damp rooms without adequate ventilation, such as bathrooms
  • Areas where there has been a water leak
  • Basements with higher humidity levels
  • Areas with significant water condensation

Detecting mould early can prevent extensive damage and health issues. Here are the signs to look for:

Visual Indicators

Discoloration: Stains or spots on walls, ceilings, and floors

Surface Changes: Peeling, bubbling, or cracking paint or wallpaper

Growth: Fuzzy, slimy, or velvety patches in various colours

Odour Indicators

Musty Smell: A persistent, damp, earthy odour is a strong indicator of mould presence

Health Indicators

Allergy Symptoms: Increased sneezing, coughing, runny nose, or itchy eyes

Respiratory Issues: Worsening asthma, shortness of breath, or other respiratory problems

When Should You Take Action?

Immediate action is required if you notice:

  • Ideally, less t than 48 hours after the mould first appears
  • Large areas (greater than 5 square feet) covered in mould
  • Mould growth after a recent water damage incident
  • Health issues among building occupants that improve when away from the property

Section 3: How to Remove Mould

DIY Mould Removal Steps

For small jobs, removing mould 48 hours after it first appears is critical. Here are some steps you should take:

Safety First: Wear protective gear, including gloves, an N-95 or better facemask, and goggles.

Isolate the Area: Seal off the affected area to prevent spore spread.

Clean and Dry: Scrub mouldy surfaces with soap and water, then disinfect with a solution of 1 cup of bleach in 1 gallon of water. Ensure the area is thoroughly dried.

Dispose of Contaminated Materials: Safely dispose of any mouldy materials that cannot be cleaned, such as carpets or ceiling tiles.

Monitor: Regularly check the area for any signs of recurring mould.

Professional Mould Removal Services

For larger areas or severe infestations, it is best to work with a professional mould removal service. Here’s how professionals can help:

Comprehensive Inspection

Identification: Experts use advanced tools and techniques to identify the type and extent of mould.

Moisture Source Detection: Professionals locate and address the source of moisture that is fostering mould growth.

Effective Remediation

Containment: Properly contain the affected area to prevent the spread of mould spores.

Removal: Use specialized equipment and cleaners to safely remove mould.

Restoration: Restore affected areas to their original condition, including repairs and replacements as necessary.

Preventive Measures

Controlling moisture is essential to preventing mould growth in your home. The following tips will help you keep mould at bay:

  • Maintain indoor humidity below 50%. Use an air conditioner or dehumidifier to achieve this.
  • Ensure your home or business is clean, dry, and well-ventilated.
  • Immediately repair any water leaks.
  • Use ventilation fans in the kitchen and bathrooms.
  • Avoid installing carpet in areas prone to moisture, such as basements, kitchens, and bathrooms.
  • Quickly dry floors, wet floor mats and carpets

Why Work with a Professional Remediation Company?

Choosing a professional remediation company for mould removal ensures:

Safety: Professionals have the training and equipment to handle mould safely.

Thoroughness: Comprehensive services that address the root cause and prevent recurrence.

Peace of Mind: Assurance that your property is restored to a safe and healthy condition.

In conclusion, mould removal is crucial for maintaining a healthy and safe environment in both residential and commercial settings. By understanding the types of mould, recognizing the signs, and knowing when to seek professional help, you can effectively manage and prevent mould issues.

If you suspect mould in your property, don’t hesitate to contact us. For expert mould removal and remediation, contact our team today. We serve residential and commercial properties across southern Ontario, ensuring a healthier and more pleasant environment for your business.