Roof Moss & Algae Treatment in Markham.
Kill and prevent the black streaks (Gloeocapsa magma) and moss patches that shorten Toronto shingle life. Markham homes see hard freeze-thaw cycles every winter — that's the #1 accelerator of chimney damage in the GTA. An annual sweep and inspection is the single cheapest insurance you can buy for your home.
Your quote — in 3 quick taps.
A certified expert calls or texts back in under 15 minutes. No spam. Fixed-price written quote.
Moss Treatment you can actually trust
Those black streaks on north-facing Toronto roofs are algae eating limestone filler in the shingle. Left alone they cut shingle life 30%. We apply a shingle-safe treatment that kills the colony, brush off moss patches, then install a zinc strip so rainwater does the maintenance for the next decade.
Every Markham technician is WETT SITE-Basic certified at minimum, with two inspectors carrying full SITE-Comprehensive credentials.
What's included
Benefits
- ✓ Kills the algae at the root
- ✓ Removes moss patches by hand — no scraping
- ✓ Zinc strip prevents 8–10 years of regrowth
- ✓ Extends shingle life by ~30%
Our process
- 1. Apply shingle-safe algaecide, dwell 20 min
- 2. Hand-brush any moss patches
- 3. Rinse with low-pressure fan spray
- 4. Install continuous zinc strip at ridge
We serve every Markham neighbourhood
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Moss Treatment in Markham — common questions
What causes black streaks on my roof?+
Gloeocapsa magma — a blue-green algae that feeds on limestone in asphalt shingles. Common on north-facing slopes in humid Toronto neighbourhoods.
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Book Moss Treatment in Markham
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Service · urgency · contact. A chimney expert replies in under 15 minutes.
- Fixed-price written quote
- No spam, no sales calls
- WETT & CSIA certified