How often should I have my roof professionally cleaned?

Most roofs benefit from professional cleaning every 1–3 years, depending on the roofing material, surrounding trees, and exposure to moss, lichen, and algae. In damp Otago conditions, some roofs may require more frequent maintenance.

What types of roofs do you clean?

We clean a range of residential and commercial roofing surfaces, including: Coloursteel roofs Tile roofs Concrete tile roofs Metal roofing Long-run roofing Residential and commercial roofs If you’re unsure whether we can clean your roof, contact us for advice.

Why does my roof have moss, lichen, or black stains?

Roof surfaces naturally collect moisture, dirt, and organic growth over time. Moss, lichen, algae, and mould are especially common in shaded or damp areas and can affect both the appearance and condition of your roof.

Is roof cleaning safe for my roof?

Yes. We use appropriate cleaning methods and equipment designed to safely clean roofing surfaces while minimising the risk of damage.

Roof Cleaning in Dunedin and Otago

Professional Moss, Lichen & Algae Removal That Protects Your Roof

Call today for a free, obligation-free quote on roof cleaning in Dunedin and Otago. 📞 021 137 0732 ✉️ servicesotago@gmail.com

PROFESSIONAL ROOF CLEANING & ROOF TREATMENT SERVICES IN DUNEDIN

Your roof is the hardest-working surface on your property — constantly exposed to rain, UV, wind, and everything Otago's climate delivers. It's also one of the most commonly neglected surfaces when it comes to maintenance. Out of sight, out of mind. Until the moss is thick enough to see from the street, or a roof inspection reveals damage that's been building quietly for years.

At Blast Off Otago, we provide professional roof cleaning in Dunedin and across the Otago region, using a safe soft wash method that removes moss, lichen, algae, and organic staining without the risk of damage that high-pressure washing causes on roofing materials. A clean, treated roof doesn't just look better — it lasts longer, performs better, and protects the rest of your home from the water damage that unchecked organic growth causes over time.

What Roofs We Clean

We clean all common residential roofing types across Dunedin and Otago:

Coloursteel and pre-painted metal roofing — cleaned with appropriate soft wash to protect coatings
Long-run steel roofing — careful technique to avoid water ingress at laps and seams
Concrete tile roofing — soft wash with specialist treatment to address lichen without surface damage
Clay tile roofing — gentle method essential to protect glazed and unglazed tile surfaces
Butynol and membrane roofing — assessed individually; not all membrane types are suited to chemical treatment

If you're unsure whether your roof type is suitable, give us a call — we're happy to advise before you commit to a booking.

Roof Cleaning Oamaru and North Otago

We service the full Otago region, including Oamaru and North Otago, where roof cleaning demand is strong given the area's high rainfall and the particular challenge that Oamaru stone dust and coastal conditions create for roofing materials. Roof cleaning in Oamaru is a regular part of our schedule and we're familiar with the roof types and conditions common in the area.

Soft Wash Roof Cleaning — Why Method Matters

High-pressure washing is one of the worst things you can do to most roofing materials. On metal roofing, aggressive pressure can dent, score, and strip protective coatings. On concrete and clay tiles, it erodes the surface, displaces granules, and can crack tiles outright. On long-run steel roofing, it drives water into laps and seams. The short-term result looks clean; the long-term result is a roof that has been physically damaged and will deteriorate faster as a result.

Our soft wash roof cleaning method uses low-pressure water application combined with specialist biocidal treatments that are designed specifically for roofing surfaces. The treatment does the work — breaking down and killing the organic growth at a biological level — rather than relying on brute water pressure. The result is a thorough clean that respects the integrity of the roofing material and is safe across all roof types.