What should be on a roof maintenance checklist for BC homeowners?

A complete BC roof maintenance checklist includes: (1) clear gutters twice yearly — quarterly if heavy tree cover, (2) trim overhanging branches to 2–3m clearance, (3) inspect flashing and penetrations every autumn, (4) address moss growth early without pressure washing, (5) verify attic ventilation is adequate, and (6) schedule a GoNano assessment at year 8–10 for preventative treatment or year 10–18 for rejuvenation.

How often should I inspect my roof in BC?

BC homeowners should inspect their roof at least twice a year — once in spring after the wet season, and once in autumn before winter. Look for granule loss in gutters, moss growth, lifted shingle edges, and dark staining. A professional assessment every 3–5 years is also recommended for roofs over 8 years old.

How do I prevent moss on my BC roof?

The most effective moss prevention is GoNano NuRoof treatment — a hydrophobic nano-coating that prevents moss spores from adhering to shingles. For interim maintenance, keep gutters clear, trim overhanging branches, and avoid pressure washing (which strips granules). Zinc strips provide limited protection in a narrow band only.

When should I get a professional roof assessment in BC?

Get a professional assessment if your roof is 8+ years old, if you see granule loss in gutters, visible moss growth, lifted or curling shingles, or dark staining. NanoShieldBC offers free roof condition assessments across Metro Vancouver and the Fraser Valley.

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BC Roof Maintenance Checklist

BC's wet climate demands more from your roof than most of Canada. This seasonal checklist helps you stay ahead of problems — and avoid expensive repairs.

🍂 Fall (September–November)

Clean gutters and downspouts

Blocked gutters cause water to back up under shingles — a leading cause of leaks.

Trim overhanging branches

Branches drop leaves and needles that trap moisture and accelerate moss growth.

Check flashing around chimney and vents

Flashing failures are the #1 cause of roof leaks. Fall is the time to find and fix them before winter rains.

Inspect shingles from the ground

Look for curling, missing, or visibly damaged shingles before the wet season begins.

Check attic ventilation

Poor ventilation causes moisture buildup that rots the roof deck from inside.

❄️ Winter (December–February)

Monitor for ice dams (if applicable)

Ice dams form when heat escapes through the roof and melts snow that refreezes at the eaves.

Check attic after heavy rain

Look for water stains, drips, or moisture — early detection prevents major damage.

Keep gutters clear of debris

Winter debris accumulation blocks drainage and adds weight stress to gutters.

Note any moss growth

Moss grows fastest in BC winters. Document coverage to track progression.

🌸 Spring (March–May)

Full visual inspection from ground

Winter weather may have caused damage. Spring is the ideal time to assess.

Check for granules in gutters

Granule loss accelerates in winter. Spring gutter cleaning reveals how much was lost.

Assess moss and algae coverage

Spring is when moss is most visible. Assess coverage and consider treatment.

Inspect all flashings

Freeze-thaw cycling can loosen or crack flashings. Check all penetrations.

Consider professional assessment

If your roof is 8+ years old, spring is the ideal time for a professional condition assessment.

☀️ Summer (June–August)

Ideal time for GoNano treatment

Dry weather and warm temperatures are optimal for GoNano application and curing.

Check for UV damage

Summer UV accelerates oil depletion. Look for fading, brittleness, or bare spots.

Clean gutters after spring pollen season

Pollen and seed pods accumulate in spring and can block drainage.

Trim vegetation away from roof

Summer growth can bring branches and leaves into contact with shingles.

Is Your Roof Due for a Professional Assessment?

If your roof is 8+ years old, book a free inspection. We'll give you a complete condition report and honest recommendation.

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Related Resources

Guide7 Signs Your Roof Needs TreatmentKnow when maintenance isn't enough and treatment is needed.Read more GuideHow Moss Damages ShinglesThe 4 stages of moss damage — catch it early.Read more GuideLower Mainland Roof ProblemsBC's 5 biggest roofing threats explained.Read more ServiceRoof Moss Removal ServiceProfessional moss removal and GoNano protection.Read more ServiceFree Roof InspectionBook a professional condition assessment — no obligation.Read more GuideIs Roof Rejuvenation Worth It?Honest ROI analysis for BC homeowners.Read more