Asbestos in Roofing

In Quebec, many buildings built before the 1990s still have an asbestos roof, often in the form of roofing shingles asbestos or fiber cement panels.
If your home or building is affected, it’s essential to understand the risks, legal obligations, and available solutions.

In this article, our experts explain everything you need to know about asbestos roofing, with a safe approach that complies with Quebec regulations.

What is an asbestos roof?

Asbestos is a mineral fiber that was widely used in construction materials due to its fire, moisture, and chemical resistance.
It is commonly found in:

• roofing shingles asbestos,
• fiber cement panels,
• certain insulation membranes.

In Quebec, buildings constructed between the 1940s and 1990s are most likely to contain this material.
Fiber cement asbestos roofing was especially popular in industrial, agricultural, and residential buildings.

What are the health risks of asbestos?

Asbestos becomes dangerous when it is friable—meaning the fibers can break off and become airborne.
This typically happens during:

• renovations,
• roofing damage,
• deterioration over time.

Inhaling asbestos fibers poses serious health risks, including asbestosis (lung fibrosis), lung cancer, and mesothelioma, a rare cancer affecting the pleura.
Classified as an extremely hazardous contaminant by the CNESST, asbestos is strictly regulated in Quebec in terms of prevention and handling.

How do you know if your roof contains asbestos?

Asbestos cannot be identified with the naked eye.
If your building was constructed before 1990, it’s potentially at risk.
The first step is to check the age of the building to assess the likelihood of contamination.

To confirm the presence of an asbestos roof, a sample must be analyzed in a lab.
This should only be performed by a specialized company.
If in doubt, call certified professionals—handling asbestos materials requires strict expertise.

Can an asbestos roof be covered?

Yes, in certain cases, it is possible to cover an asbestos roofing system without removing it, provided the structure is in good condition.
This solution is often less expensive than a full asbestos roof replacement, less invasive, and compliant with regulations if done by qualified roofers.

However, this option must be approved by a certified roofer or expert. Any improper manipulation or deterioration could release harmful fibers into the air.

Is it mandatory to remove an asbestos roof?

No, you are not legally required to remove an asbestos roof as long as it remains in good condition and poses no immediate danger.
However, according to Quebec’s Occupational Health and Safety Regulation (RSST), any renovation, repair, or demolition work involving asbestos materials must:

• be carried out by trained workers,
• follow strict prevention protocols,
• be reported to the CNESST.

In other words, even for minor work, proper contamination control measures must be in place.

What are the steps for a safe asbestos roof removal?

Removing asbestos roofing requires a precise procedure:

1. Inspection by an industrial hygiene specialist

A professional assesses the condition of asbestos materials and determines the health risks.
This step allows proper planning of safety measures before any work begins.

2. A work plan that meets CNESST standards

A detailed plan is written according to provincial standards.
It outlines the methods, equipment, and protection required to ensure everyone’s safety.

3. Establishing a security perimeter and containment system

The risk zone is isolated using barriers and airtight containment systems.
This prevents asbestos fibers from spreading into the air and nearby areas.

4. Work carried out by certified asbestos abatement professionals

Only accredited and trained specialists can handle and remove asbestos materials.
They use protective gear and follow strict protocols to avoid contamination.

5. Safe disposal of contaminated waste in authorized facilities

Removed materials are carefully packaged and transported to specialized centers.
This disposal process is regulated to protect both the public and the environment.

At Duro-Toit, we work with qualified partners to provide safe and compliant asbestos roof replacement services.

Why hire roofing experts in Quebec?

Quebec’s climate, characterized by freeze, rain, and humidity, accelerates roof damaged, including asbestos roofing made from fiber cement. By hiring a professional roofer, you get a reliable assessment of your roof’s condition and long-lasting solutions tailored to your needs.
It also ensures full compliance with safety regulations and protects the health of your family or building occupants.

At Les Couvreurs Duro-Toit, we take a rigorous and personalized approach, in line with Quebec’s laws.
From inspection to roof covering or asbestos roof replacement, every step is managed by qualified experts. Trust our team for fast, safe, and professional roofing work done right.