Roof Cleaning & Moss Treatment in Auckland – Protect Your Tiles & Iron Roofs Year-Round

Your roof is your home’s first line of defence — against sun, storms, humidity, and sea spray. But in Auckland’s subtropical climate, it’s also the perfect breeding ground for moss, lichen, mould, and black algae.

Whether you’re in Titirangi, Devonport, or East Auckland, these growths don’t just make your roof look bad — they trap moisture, damage roofing materials, and reduce your roof’s lifespan.

At Metro Water Blasting Auckland, we specialise in low-pressure roof cleaning and moss treatment. It’s safe for all types of roofing — including concrete tile, Colorsteel, corrugated iron, and Decramastic — and it works without the risks of water blasting.

Let’s break down how moss damages roofs, how our treatment process works, and why regular roof care is a must for Auckland homeowners.

Why Auckland Roofs Are Prone to Moss & Lichen

Auckland’s location and weather patterns mean your roof is constantly exposed to:

  • High humidity → encourages organic growth

  • Frequent rain → feeds moss and algae

  • Tree cover → drops seeds and shade encourages growth

  • Salt air (near coastal suburbs) → accelerates corrosion

  • Cooler shaded areas → perfect for lichen to thrive

Even in sunny suburbs like Onehunga or Remuera, spores travel easily in the wind and take root where water and shade meet.

What Happens If You Don’t Clean Your Roof?

  • Concrete tiles crack as moss expands and lifts them

  • Iron and Colorsteel roofs rust under organic buildup

  • Blocked gutters overflow and cause internal water damage

  • Mould spreads into ceiling cavities and insulation

  • Your roof’s lifespan shortens — sometimes by 30% or more

And worse — insurance companies may decline claims if your roof is deemed “poorly maintained.”

Our Safe, No-Pressure Roof Treatment System

Unlike water blasting, which can dislodge tiles and damage seals, our treatment process is safe, effective, and lasts for years.

Step 1: Roof Inspection

We assess your roof type, pitch, age, and moss/lichen coverage. We also check flashing, skylights, and fragile areas.

Step 2: Biocide Treatment Application

We apply a biodegradable, moss-killing solution across the entire roof using a low-pressure sprayer. This solution penetrates the moss and kills spores at the root.

Step 3: Let Nature Do the Work

Over 4–8 weeks, the dead moss and lichen break down naturally and wash away in the rain. The result? A cleaner, healthier roof without risk of damage.

Optional: Gutter Cleaning

Post-treatment, we recommend a gutter clean to remove loosened debris and prevent overflow.

Roof Types We Treat in Auckland

We clean and treat all major roofing materials:

  • Concrete tile roofs

  • Clay tiles

  • Corrugated iron and long-run steel

  • Colorsteel and Galvsteel

  • Decramastic and pressed metal tiles

  • Painted metal roofing systems

From historic villas in Ponsonby to new Colorsteel builds in Flat Bush, we’ve got the equipment and experience to clean any roof safely.

Soft Washing vs Water Blasting: Why Pressure Is Risky

Water blasting your roof might seem like a fast fix — but it causes more problems than it solves:

 

Risk Problem
High pressure Lifts tiles, strips paint, dislodges nails or flashing
Moisture intrusion Forces water under tiles or into ceiling space
Short-term results Doesn’t kill spores, so moss returns quickly
Safety risk Dangerous to walk on wet, pitched roofs while blasting

That’s why soft chemical treatment is the gold standard for roof cleaning — recommended by roofing manufacturers and Auckland property managers alike.

How Often Should You Treat Your Roof?

 

Condition Treatment Frequency
Coastal homes (Mission Bay, Devonport) Every 12–18 months
Tree-covered homes (Titirangi, Greenhithe) Annually
Urban homes (Epsom, Newmarket) Every 2 years
After moss is visible or before repainting Immediately

If you’ve never treated your roof — or haven’t done it in 2+ years — it’s time.

Real Client Story: Roof Rescue in Glenfield

A client in Glenfield had a 20-year-old tile roof covered in thick lichen and moss. They were quoted thousands for a roof replacement.

We inspected and treated the roof using our soft chemical spray. Within 6 weeks, the lichen turned brown and fell away. The roof was restored to near-new condition — and the owner saved over $9,000.

Add-On Services for Total Roofline Health

Combine your roof treatment with:

  • Gutter cleaning and flushing

  • Fascia and soffit soft wash

  • Pre-paint washing for Colorsteel

  • Solar panel cleaning

Get a full roofline refresh and avoid moisture or drainage issues down the line.

Where We Work in Auckland

We service every suburb and roof type across the region, including:

  • Central Auckland – Parnell, Mt Eden, Epsom

  • North Shore – Takapuna, Albany, Birkenhead

  • East Auckland – Howick, Botany, Pakuranga

  • West Auckland – Titirangi, Henderson, Glen Eden

  • South Auckland – Manurewa, Takanini, Flat Bush

  • Rodney District – Orewa, Silverdale, Warkworth

No roof is too steep, too large, or too delicate — we’ve seen it all and cleaned it all.

Book a Roof Treatment in Auckland Today

Don’t wait until you see moss falling off your gutters or water dripping inside your ceiling.

📞 Call our team at 0800 997 997
💻 Or book online now at Metro Water Blasting Auckland

We’ll inspect, treat, and protect your roof — with no pressure, no mess, and long-lasting results.

Request A Quote