When to Wash Your Roof in Wellington

Wellington roofs take a beating from wind-driven rain, salt spray near the coast, and limited sun on south-facing slopes. Moss and lichen don't just look unsightly — they hold moisture against tiles and iron, accelerating corrosion and blocking gutters.

Best time of year: Late summer through autumn (February–April) is ideal. Surfaces are dry enough for biocide to bind, and you clear buildup before winter storms.

Signs you need treatment: Green/black streaks on north-facing slopes, moss in roof valleys, or gutters overflowing after moderate rain.

Soft wash vs pressure wash: We use low-pressure biocide application that kills growth at the root. High-pressure washing strips protective coatings and voids warranties on Colorsteel and concrete tile.

How often: Most Wellington homes benefit from a roof treatment every 18–24 months, with an annual house wash to keep cladding clean.