The importance of roof cleaning
Mossy and algae filled roof typical of climate in the Pacific Northwest.
If you’ve ever noticed dark streaks, moss, or patches of green spreading across rooftops in Metro Vancouver, you’re not alone. Our wet, mild climate is the perfect environment for moss, algae, and lichen to thrive. While it might seem like just a cosmetic issue, leaving your roof untreated can lead to real damage and expensive repairs down the road.
What’s Growing on Your Roof
Algae causes those dark streaks you see on shingles. It feeds on limestone, slowly degrading roofing materials.
Moss acts like a sponge, trapping moisture against the roof. Over time, it can lift shingles, cause leaks, and shorten the roof’s life.
Lichen bonds tightly to surfaces and can stain permanently if ignored.
These organisms love shady, damp areas—north-facing roofs or homes surrounded by trees are especially vulnerable.
Why Soft Washing Beats High Pressure
Using a pressure washer on a roof can strip protective granules, break shingles, and void warranties. The right way is soft washing:
Uses low pressure and specialized cleaning solutions.
Removes moss and algae gently without damaging the roof.
Helps prevent regrowth longer than a basic rinse.
For asphalt shingles, tile, or older roofs, soft washing is the safest and most effective method.
How Often Should You Clean Your Roof?
In Metro Vancouver’s climate, a good rule of thumb is:
Full roof cleaning every 2–3 years to keep growth under control.
Annual inspections or spot treatments in shady or problem areas to catch moss early.
After big storms, check for branches or debris that could trap moisture.
Simple Prevention Tips
Trim overhanging branches to let more sunlight reach the roof.
Keep gutters clean so water drains properly.
Install zinc or copper strips near the roof ridge—rainwater activates them to help prevent moss naturally.
The Bottom Line
Regular roof cleaning isn’t just about looks. It protects your shingles, prevents leaks, and extends the life of one of your biggest investments: your home. With the right soft washing approach, you can keep your roof clean, healthy, and ready to withstand Metro Vancouver’s weather year after year.
Ready to give your roof a fresh start? Book a professional roof cleaning with our team today.
