Mould Remediation

Restoring healthy indoor environments

If you’ve experienced water damage or humid conditions and suspect that you have mould somewhere within your property, allow our mould-remediation specialists to evaluate the source and extent of the mould growth. We will identify and perform the appropriate remediation steps necessary to quickly restore healthy indoor environment.

[Narrator] So we received a call for a rooftop fire that took many, many hours to put the fire out, and many, many thousands of gallons of water. It turned into a very extensive water damage event for the customer. This facility is located on a campus of a large university, and it happened to be their primary office in laboratory building. When I first arrived on site, I mean, I knew it had been sitting for a while, and I knew it was gonna be mouldy, and I knew it was gonna be a problem. And as we were getting ready to go, and putting our personal protective equipment on, someone opened the front door and from 20 feet away I could smell it right away. And when you smell something like that, that’s that mouldy, it just doesn’t lead you right away. Given the amount of mould present and the amount of other issues related to it being an older building, there’s a great deal of health concern among all of their occupants and staff, and students as to, can this building be made safe again? So we separated the project into two separate phases. The initial phase was to get all of the bad things out, make the building safe, and the second phase was to design and rebuild the damaged building. During the initial phases of the project, we mobilized in excess of 350 people. Mould is not a detail we can turn a blind eye to. If we leave a little bit of mould, if a corner is cut, if something’s ignored, that problem will continue to propagate, continue to get worse, and that building will continue to cause health problems for the occupants of that building well into the future. First Onsite always adheres to industry related guidelines and we’re very specific about the types of technicians, and their training and certification, and if appropriate, licensing to complete this work. The right way to do this is to do it all, do it once, and do it now. And that protects everyone’s health and safety, protects everyone’s liability, and makes for a much cleaner and safer environment for all of us. As we progressed through the project, the customer was ever-appreciative. The customer had a large grand reopening ceremony, a lot of local dignitaries and politicians, and it was great to be able to attend that and see this nice finished school. But really what was the most rewarding is being there that first week of September when the students are coming back, many international students from all over the world, and seeing them be able to continue their education and walk right back into their school again was by far the most rewarding part of the experience.

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Visible mould growth

Discoloured spots or streaks with fuzzy, velvety, or slimy texture can be common signs of mould.

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Musty odours

A musty or damp smell is a sign that mould is present but may not be visible.

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Water damage or leaks

Water damage or leaks provide the necessary moisture, combined with warmth and organic matter, for mould spores to thrive.

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Health issues

You or someone in your home or business is experiencing worsened or unexplained health issues, such as allergies, asthma, respiratory problems, or headaches.

Steps to Take if You Suspect Mould

Mould can be hard to identify, but if you suspect your property has mould or mildew (a type of mould), it’s crucial to act fast.

  • Find the source: If you can identify the source of the moisture creating the conditions to support mould growth, take steps to stop it. If you cannot find the source or need help addressing the issue, we can assist you.
  • Get a report: To begin the mould remediation process, you may need a report from an Industrial Hygienist, Mould Assessor or Environmental Consultant. They will be able to verify the genome and species of mould and the extent of the growth.
Mould growing on drywall

First Onsite Mould Remediation Process

Mould remediation refers to removing mould, disinfecting, and restoring affected areas. Our teams bring decades of experience and adhere to strict industry practices and regulations on every mould remediation job.

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Eliminate the source
Eliminate the Mould
Eliminate the source

We will first address the cause of the mould and make any necessary repairs. This may involve fixing a leak, addressing a plumbing issue or correcting a ventilation problem.

Contain the mould
Mould Containment
Contain the mould

It is vital to contain the affected area to prevent the spread of mould spores. This step may involve sealing off the area with plastic sheeting or other materials and establishing negative air pressure within the enclosure to prevent mould spores from escaping the work area.

Remove the mould
Mould Removal
Remove the mould

Once mould is contained, it can be removed using specialized cleaning products and techniques. This may involve scraping or sanding the mouldy surfaces or using a chemical agent to kill the mould.

Clean and apply disinfectant to the affected area
Mould Disinfectant
Clean and apply disinfectant

After removing the mould, we thoroughly clean and apply an appropriate disinfectant to the area, eliminating any remaining mould spores.

Repair any damage
Reconstruction and Restoration Services
Repair any damage

The final step in the process is to repair all existing damage from the source or damage caused by mould growth. The repair process may involve replacing drywall, repainting surfaces or replacing damaged materials.

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The Benefit of Hiring a Mould and Mildew Remediation Partner

Safety is a significant concern during mould removal; it’s essential to take precautions to avoid the spread of mould spores. Improper techniques or incomplete remediation by untrained people can lead to unhealthy indoor air quality, future regrowth, and damage to the structure.  Ensuring safe removal and minimizing additional risks requires the experience of a professional team with the proper training and equipment to effectively eliminate the threat of future regrowth and further damage.

We call on decades of experience and strict adherence to regulations, standards, and guidelines to make the mould and mildew remediation process effective and efficient. If you suspect mould or mildew within your property, contact our emergency call centre. It’s available 24 hours a day, 365 days a year. Our services are available to you at any time. See our coverage map here.

Man in First Onsite reflective vest and hard hat reaching up toward the ceiling of the room


Creating a disaster response plan allows us to respond even more quickly and effectively. By meeting with you before any damage occurs, our teams can familiarize themselves with your property, identify important points of concern, and develop a customized plan tailored to your facility’s unique requirements. This preplanning helps us to equip you with the necessary resources to react rapidly when the need arises.

  • Create a response plan for any disaster
  • Establish a point of contact dedicated to you
  • Speed up response time and the restoration process as well as reduce the amount of downtime
  • Access to resources like storm preparation tips and information sessions

Let us help you prepare for the unexpected

When disaster strikes, knowing what to expect can make a world of difference. Discover what our specialists have to say about preparing for disaster, expediting recovery, and everything in between. We’re here to help, always.


Mould remediation is the process of removing mould growth, repairing any damage caused by the mould, and preventing future mould growth. It’s important to have mould removed by professionals to ensure thorough cleaning and prevention of future growth. It’s necessary because mould can be harmful to the health of anyone within your building or home while also damaging the integrity of the building materials.

We use a variety of techniques to identify mould growth, including a visual inspection, air and surface sampling and moisture testing. We’ll determine the type of mould present, the extent of the growth, and develop a plan to remove it safely and effectively.

During mould remediation, safety is a top priority, and our professionals wear personal protective equipment to prevent exposure to mould spores. It’s critical to hire a restoration company with trained and certified professionals who follow industry-standard safety procedures to safely restore your property.

To prevent future mould growth, it’s important to address any moisture issues in the property such as preventing water leaks, ensuring proper ventilation, and controlling humidity levels. We can provide guidance on how to prevent future mould growth and develop a prevention plan specific to your property.