Moss on your roof is one of the most common problems for Surrey BC homeowners — and one of the most damaging if left untreated. Surrey’s wet Pacific climate is ideal for moss growth, especially on north-facing or shaded roof sections. I-M Roofing Ltd. removes moss safely without damaging your shingles and applies zinc or copper treatments to prevent regrowth.
Why Moss Grows on Surrey BC Roofs
Moss thrives in cool, damp, shaded conditions — exactly what Metro Vancouver and Surrey provide for 8+ months of the year. Key factors that accelerate moss growth on Surrey roofs:
- North or west-facing roof slopes with minimal direct sun
- Overhanging trees dropping debris and blocking drainage
- Older 3-tab shingles with rough surface texture
- Blocked gutters that keep moisture high on the eaves
- Low roof pitch (4/12 or less) where water sits longer
Moss Removal Cost Surrey BC — 2026 Prices
| Service | Typical Cost | Notes |
|---|---|---|
| Soft-wash moss removal (up to 1,500 sq ft) | $300–$550 | Most common treatment |
| Full roof cleaning & moss removal (2,000+ sq ft) | $450–$900 | Two-storey homes |
| Zinc strip installation (moss prevention) | $200–$500 | Lasts 5–8 years |
| Roof cleaning + moss treatment combo | $550–$1,100 | Best value |
Moss Removal Methods — What’s Safe for Asphalt Shingles
Soft washing (low-pressure + treatment): The safest and most effective method. A biodegradable cleaning solution kills moss, lichens, and algae without stripping granules. This is what I-M Roofing uses.
Manual brushing: Effective but slow. Best for isolated patches. Risk of granule loss if brushed too aggressively — always brush downward, never against the shingle.
High-pressure washing: NOT recommended for asphalt shingles. Strips granules and voids most manufacturer warranties. Acceptable for concrete tiles only.
Moss Prevention — What Actually Works in Surrey BC
- Zinc or copper strips at the ridge: Rain water carries metal ions down the slope, inhibiting moss at concentrations that don’t harm shingles. Effective for 5–8 years.
- Annual zinc sulphate treatment: Spray applied in early spring, before moss resumes active growth. Most cost-effective long-term approach.
- Tree trimming: Removing branches overhanging the roof improves sunlight and air circulation — the best long-term prevention.
- Gutter cleaning every fall: Prevents moisture backup that feeds eave-level moss growth.
Does Moss Damage Shingles?
Yes — but slowly. Moss holds moisture against the shingle surface, accelerating the degradation of the asphalt layer and lifting shingle edges. A roof with untreated moss for 3+ years can lose 2–5 years of its remaining lifespan. Heavier moss (thick mats, visible from the ground) is penetrating under shingle edges and causing physical lifting — that stage requires immediate treatment.
Frequently Asked Questions — Moss on Roof Surrey BC
Is moss on my roof covered by insurance?
No. Moss damage is considered a maintenance issue and is not covered by home insurance policies in BC. However, if moss-related moisture damage causes a structural leak, the consequential water damage may be covered — keep maintenance records to support any claim.
How often should I have my roof treated for moss in Surrey?
Most Surrey homeowners need a treatment every 2–3 years. Homes with heavy tree coverage may need annual treatment. After applying zinc strips or an annual zinc sulphate spray, many homeowners can extend intervals to 4–5 years.
Can I remove roof moss myself?
Yes, for small patches on accessible roofs. Use a stiff-bristle brush (sweep downward only), apply a store-bought zinc sulphate spray, and install zinc strips at the ridge. For full-roof treatment, a professional is safer and more thorough — working on wet, moss-covered shingles is slippery and dangerous.
Related Services
- Roof Cleaning Surrey BC — Full-Service Soft Wash
- Roof Inspection Surrey BC — Free Inspection with Estimate
- Gutter Cleaning Surrey BC — Prevent Moss-Feeding Moisture Backup
- Roof Repair Surrey BC — Fix Moss-Related Shingle Damage
Free Estimate: 236-838-9577 | Licensed & Insured | Serving Surrey, Delta, Langley & Burnaby
