How do I remove moss and algae from interlock pavers in Vancouver?

Moss and algae removal from interlock pavers in Vancouver requires a combination of mechanical cleaning, chemical treatment, and preventive measures — this is one of the most common maintenance challenges in Metro Vancouver's persistently moist climate.

The most effective approach starts with pressure washing using a surface cleaner attachment at 1,500-2,500 PSI. The rotating surface cleaner prevents striping and provides even cleaning across the paver surface. Work systematically across the entire area, overlapping passes slightly. This mechanical removal eliminates most of the visible moss and algae growth while avoiding the surface damage that can occur from using too high pressure or incorrect nozzle angles.

For stubborn moss that pressure washing doesn't fully remove, apply a moss killer containing iron sulphate or zinc sulphate after the initial cleaning. These products are specifically formulated for moss control and won't damage concrete pavers or surrounding vegetation when used according to label directions. Avoid chlorine bleach, which damages polymeric sand, kills nearby plants, and can discolour coloured pavers. Commercial paver cleaners like those from SealGreen, Techniseal, or Alliance are formulated specifically for interlock surfaces and work well on both moss and algae.

Metro Vancouver's climate makes moss and algae growth inevitable — especially on north-facing installations and areas shaded by trees, buildings, or fences. The combination of 1,200mm+ annual rainfall, 60-80% humidity levels, and mild temperatures creates ideal growing conditions year-round. Areas that stay damp longer (under roof drip lines, in tree shade, or where drainage is poor) will see faster regrowth. This isn't a sign of poor installation — it's simply the reality of hardscaping in a marine climate.

Prevention is more effective than repeated removal. After cleaning, replenish polymeric sand in the joints if it appears thin or washed out. Fresh polymeric sand creates a harder surface that resists moss penetration better than eroded joints. Consider applying a penetrating paver sealer designed for your specific paver type — sealers don't prevent moss growth entirely but make future cleaning significantly easier and reduce the rate of regrowth.

Timing matters for both treatment and prevention. The best time for moss treatment is during Vancouver's drier months (May through September) when you can ensure the treatment has time to work before being diluted by rain. Plan to clean and treat pavers every 1-2 years, or whenever moss growth becomes noticeable. Properties with heavy tree cover or poor drainage may need annual treatment.

For severe moss infestations or recurring problems, consider improving drainage around the affected area, trimming overhanging branches to increase sunlight and air circulation, or installing French drains to reduce standing moisture. Sometimes the issue isn't the pavers themselves but water pooling due to inadequate slope or blocked drainage.

This is definitely a DIY-friendly maintenance task that most Vancouver homeowners can handle with a pressure washer rental and appropriate moss treatment products. However, if you're dealing with extensive moss growth across a large area, or if the moss keeps returning quickly despite treatment, it may indicate underlying drainage issues that require professional assessment and correction.

Need help finding an interlock contractor for drainage improvements or major cleaning projects? Vancouver Interlock can match you with experienced professionals familiar with Metro Vancouver's unique moss and maintenance challenges.

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