Auckland's warm, wet climate is ideal for moss, mould and lichen to take hold on roofs. Left untreated, biological growth holds moisture against your roofing material and accelerates deterioration. A professional biocide treatment kills the growth at the root — no pressure washing, no unnecessary foot traffic on tiles. The treatment keeps working after we leave, and rain washes the dead growth off naturally over 3–6 months.
Why Auckland Roofs Need Regular Treatment
Auckland sits at a latitude and humidity level that makes biological roof growth almost inevitable. The combination of warm temperatures, consistent rainfall and prevailing nor'westerly winds carries lichen spores from native bush and deposits them on every roof in the region. Concrete tiles are especially susceptible — their porous surface gives lichen a foothold quickly. Iron and Colorsteel roofs grow moss and algae rather than lichen, but the moisture retention problem is the same: growth holds water against the surface and significantly accelerates rust and coating breakdown.
Insurance companies are increasingly scrutinising roof condition at renewal time. A roof with visible moss and lichen growth may be flagged as poorly maintained — which can affect your cover. Treatment every 18–24 months is the most cost-effective way to protect both the roof and your insurance position.
How It Works
We start with a pre-service roof inspection to check the surface condition and confirm the treatment approach. We then apply a professional-grade biocide across the full roof surface — ridge to gutter line, every section covered. The biocide penetrates the moss, mould and lichen at the root structure and kills it. Over the following months, rainfall clears the dead growth naturally. No scrubbing, no pressure washing required.
How Often Should You Treat?
- Every 18–24 months — most Auckland homes
- Every 12–18 months — heavily shaded properties, near large trees, or high-humidity areas
- Now — if you can see green or black growth building on the roof surface
For a complete exterior refresh, many Auckland homeowners combine roof treatment with a full house wash and gutter clean in a single visit. See our spring clean bundle page for how this works.
Prices confirmed May 2026. All prices include GST and are all-inclusive — no hidden charges.
Frequently Asked Questions
How long does it take?
Most residential roofs take 45–90 minutes depending on size and access.
When will the roof look clean?
The biocide takes effect immediately but dead growth washes off gradually with rain. Most roofs show significant clearing within 4–8 weeks and are fully clear by 3–6 months.
Do I need to be home?
No — as long as we have safe access to the property and the roof.
Is it safe for my garden?
Yes. The products we use are biodegradable and break down once diluted. For properties with sensitive plantings directly below the roofline, let us know when you book.
What roofing types do you treat?
All common types — concrete tiles, terracotta, Colorsteel, pressed steel, butynol membrane and fibre cement.
Suburbs we service for roof moss treatment
We treat roofs across all Auckland suburbs. Rainfall and canopy cover vary significantly across the city — see your local suburb page for what that means for your property:
Remuera · Ponsonby · Takapuna · Albany · Mount Eden · Epsom · Botany · Howick · Pakuranga · Henderson · New Lynn · Onehunga · Manukau · Papatoetoe · Papakura · Devonport · Glenfield · Browns Bay
Not listed? See all areas we cover →