Saanich Roof Moss Removal

Vancouver Island's marine climate — persistent rainfall, mild temperatures, and high humidity — provides ideal year-round conditions for moss. Unlike colder climates where winter freezes kill moss, the Island's mild winters allow continuous growth every month of the year.

Yes. Moss retains moisture against shingles, accelerating freeze-thaw damage, granule loss on asphalt, and wood rot on cedar. Heavy moss coverage can reduce roof life by 5–10 years and void manufacturer warranties. Leaving moss untreated is one of the most common causes of premature roof failure on Vancouver Island.

DIY moss removal with a broom or garden hose can physically move moss but doesn't kill the root systems embedded in shingles. Regrowth typically occurs within 60–90 days. Professional biocide treatment eliminates the organism at root level for 3+ years.

After biocide application, treated moss dies and gradually sheds from the roof surface over 60–120 days, typically assisted by rain. The roof will appear progressively cleaner over this period. Full results visible within 3–4 months.

Yes. Most asphalt shingle manufacturers (IKO, GAF, BP, Certainteed) include maintenance clauses that can void coverage if the roof is not properly cared for. Documented heavy moss coverage is widely interpreted as improper maintenance — professional treatment and a written record protects your warranty.