How to Remove Moss, Lichen & Black Streaks From Your Roof

Your roof does more than protect your home from the elements. It also plays a big role in your property’s curb appeal. Unfortunately, many homeowners in Quebec notice dark streaks, patches of moss, or stubborn lichen creeping across their shingles. These are not just cosmetic problems. Left untreated, they can trap moisture, weaken roofing materials, and shorten the lifespan of your investment. As a trusted Montreal pressure washing company, we have helped countless homeowners restore their roofs safely and effectively. Here’s what you need to know about tackling these common issues.

Understanding the Problem

Moss, lichen, and black streaks thrive in our climate. With humid summers and long winters, rooftops in Montreal often stay damp for extended periods. Moss grows thick and spongy, lifting shingles and exposing them to water damage. Lichen creates tough, crusty spots that cling tightly to the surface and are notoriously hard to remove. Black streaks, caused by algae, spread quickly across the roof and give your home a neglected appearance.

These growths are more than just unpleasant to look at. Moss and lichen can create pathways for water to seep beneath shingles, leading to leaks, rotting wood, and expensive repairs. Algae may not seem as damaging, but over time its presence traps heat and moisture, which breaks down shingles faster.

Why DIY Solutions Fall Short

It may be tempting to grab a pressure washer or scrub brush, but aggressive cleaning can cause more harm than good. High-pressure blasts strip away protective shingle granules that your roof needs for weather resistance. Harsh household chemicals can cause damage to surrounding landscaping or run into storm drains. Even if you manage to remove visible buildup, the roots of moss and lichen often remain behind, allowing the problem to return.

DIY methods are usually short-term fixes that risk doing long-term damage. That is why homeowners often find themselves cleaning the same spots again and again without ever solving the underlying issue.

The Safe, Effective Approach

Professional soft washing is the most reliable solution. Instead of relying on high pressure, soft washing uses low-pressure rinsing combined with specialized cleaning agents designed to break down organic growth at the root. This method clears the roof of existing moss, lichen, and algae while also reducing the chances of regrowth.

At Lavage Doux Bam, we assess your roof type and level of buildup to choose the safest and most effective treatment. Our cleaning agents are eco-friendly and formulated to protect your property while delivering powerful results.

Benefits of professional roof cleaning include:

• Extending the lifespan of your shingles by removing harmful growths.
• Restoring your roof’s original color and improving curb appeal.
• Preventing costly repairs caused by water infiltration or shingle damage.
• Using eco-friendly cleaning solutions that are safe for your home and landscaping.

How Often Should You Clean Your Roof?

In Quebec’s climate, a good rule of thumb is to schedule roof cleaning every two to three years. If your home is surrounded by trees, receives limited direct sunlight, or is located in a particularly damp area, you may need service more often. Regular cleaning prevents moss, lichen, and algae from taking hold, making each cleaning session easier and more effective.

Seasonal inspections are also a smart habit. By checking your roof after heavy snow or during wet, humid summers, you can spot early signs of growth and schedule cleaning before problems worsen.

Protect Your Roof and Enhance Your Home

Your roof is one of the most important parts of your property, and it deserves careful attention. With professional help, you can stop moss, lichen, and algae in their tracks while restoring the beauty and value of your home.

Call Lavage Doux Bam today at Missing required attribute: Missing required 'which' attribute on shortcode phone-number. to schedule safe and effective roof cleaning services in Montreal. Protect your investment, restore your roof’s beauty, and enjoy the peace of mind that comes with professional results.