Asbestos cement roofs were once a popular choice for Canadian homes and farm buildings, especially from the 1950s through the 1980s. They’re durable, weather-resistant, and can last for decades. But even a tough material like asbestos cement needs some care over time. The big question is: can you maintain it yourself, or should you always call in a professional? Here’s what you need to know.

What Exactly Is an Asbestos Cement Roof?

Asbestos cement is a mixture of cement and asbestos fibres that was widely used for roofing and siding. The asbestos made the material strong, fire-resistant, and long-lasting. However, asbestos is now known to be hazardous when its fibres become airborne and are inhaled. Because of this, asbestos-containing materials (ACMs) were phased out in Canada, and the use, sale, and import of asbestos are now banned.

If your roof was installed before the late 1980s, there’s a good chance it contains asbestos. Newer fibre cement products are asbestos-free and much safer to handle.

Are You Allowed to Maintain It Yourself?

The short answer is: only to a very limited extent.

• If your roof contains asbestos, you should not clean, sand, drill, or cut it yourself. Any activity that disturbs the surface can release asbestos fibres into the air, posing serious health risks. In Canada, asbestos removal and repair must be done by trained and licensed professionals who follow strict safety regulations.

• If your roof is asbestos-free, you can handle basic maintenance tasks yourself, such as cleaning gutters, removing debris, and checking for visible damage. But even then, you should work carefully to avoid damaging the surface.

How to Tell If Your Roof Contains Asbestos

If you’re unsure whether your roof contains asbestos, don’t guess. You can:

• Check the installation date. Roofs installed before the late 1980s are likely to contain asbestos.
• Look for manufacturer markings. Some panels have codes or labels on the underside that indicate whether they’re asbestos-free.
• Have a sample tested. The safest option is to hire a certified asbestos testing service. They can take a small sample and confirm whether asbestos is present.

Never try to take a sample yourself unless you’re trained and equipped to do so safely.

What You Can Safely Do Yourself

If your roof has been confirmed asbestos-free, you can perform some light maintenance to keep it in good shape:

• Clean gutters and downspouts at least once a year to prevent water buildup.
• Remove leaves, branches, and debris from the roof surface, especially after storms.
• Inspect for moss or algae growth. A thin layer is usually harmless, but thick moss can trap moisture and shorten the roof’s lifespan.
• Check for cracks or loose fasteners. Small issues can become big problems if ignored.

Always use proper safety gear and avoid walking directly on the panels—they can be brittle, especially if they’re old.

When to Call a Professional

Even if you’re comfortable with basic upkeep, there are times when you should leave the work to experts:

• Cleaning or washing: Professional roof cleaners use low-pressure methods and approved cleaning agents that won’t damage the surface or release fibres.
• Painting or sealing: Applying a protective coating can extend the roof’s life, but it requires the right materials and techniques.
• Repairs or replacement: If you notice cracks, leaks, or signs of deterioration, contact a roofing contractor experienced with asbestos cement materials.

In Canada, asbestos abatement contractors must follow provincial and federal safety standards, including containment, air monitoring, and proper disposal procedures.

Warning Signs That Require Professional Attention

Watch for these signs that your roof may need expert help:

• Persistent dark stains or discolouration
• Cracked, flaking, or crumbling panels
• Leaks or damp spots in the attic or ceiling
• Moss growing in the joints between panels

Addressing these issues early can prevent costly damage and health risks.

How to Extend the Life of Your Roof

Whether your roof is asbestos-free or not, good maintenance habits can make a big difference:

• Schedule an annual inspection, ideally in spring after winter weather.
• Keep trees trimmed back to reduce shade and debris buildup.
• Ensure proper attic ventilation to prevent moisture accumulation.
• Have a professional inspection every 5–10 years to catch problems early.

The Bottom Line: Know Your Limits

You can handle light maintenance on an asbestos-free cement roof, but if your roof contains asbestos—or if you need cleaning, painting, or repairs—always call a professional. It’s not just about protecting your home; it’s about protecting your health.

By understanding what you can safely do yourself and when to bring in experts, you’ll keep your roof in good condition for years to come—without taking unnecessary risks.