How Moss Destroys Roofs
in the Lower Mainland
Moss isn't just cosmetic. In BC's wet climate, it's the leading cause of premature shingle failure — lifting edges, trapping moisture, and causing leaks that lead to structural damage. Here's exactly how it happens, and how GoNano BioBoost™ stops it.
How Moss Destroys Your Roof — Step by Step
This is the progression that happens on thousands of Lower Mainland roofs every year — often without the homeowner realizing until it's too late.
Moss spores land on shingles
Spores are carried by wind and birds. In BC's wet climate, they germinate within weeks on any shingle surface that stays damp.
Roots penetrate shingle surface
Moss develops root-like structures (rhizoids) that penetrate the granule layer and into the asphalt — physically breaking down the shingle material.
Edges lift and curl
As moss grows, it lifts shingle edges — creating gaps that allow wind-driven rain to get underneath. This is the primary mechanism for moss-related leaks.
Moisture is trapped
Moss acts like a sponge — holding moisture against the shingle surface for days after rain. This constant saturation accelerates granule loss and asphalt degradation.
Sheathing and structure are exposed
Once water gets under lifted shingles, it reaches the roof sheathing — causing rot, mould, and eventually structural damage that requires full replacement.
GoNano BioBoost™ — Stop Moss Before It Starts
Applied after cleaning and GoNano NuRoof treatment, BioBoost™ prevents moss, algae, and lichen from re-establishing — providing multi-year protection in BC's wet climate.
Frequently Asked Questions
Can moss actually cause a roof to leak?
Yes — moss is one of the leading causes of premature shingle failure in the Lower Mainland. Its root structures lift shingle edges, creating entry points for water. The moisture it holds against the surface also accelerates granule loss and asphalt degradation.
How do I know if moss is causing my roof leak?
If you have visible moss or dark streaking on your roof and are experiencing leaks, moss is likely a contributing factor. A professional inspection will confirm the source.
What is GoNano BioBoost™ and how does it prevent moss?
BioBoost™ is a USDA Certified Bio-Based biological growth inhibitor that prevents moss, algae, and lichen from re-establishing on treated surfaces. Applied after cleaning and GoNano NuRoof treatment, it provides multi-year protection against regrowth.
Should I pressure wash moss off my roof?
High-pressure washing strips granules and can void manufacturer warranties. We use low-pressure soft washing to remove moss safely before GoNano treatment.
How long does it take for moss to damage a roof?
Significant damage can occur within 3–5 years of moss establishment. In BC's wet climate, moss can become established within a single season on an untreated roof.