Roof Moss Treatment Services NZ | Metro Water Blasting
Professional roof moss treatment services
Residential & Commercial

Roof Moss Treatment Services

Professional roof moss, mould and lichen spray treatment throughout New Zealand. A gentle biocide alternative to roof washing with a 100% success rate — free no-obligation quote in minutes.

5.0 ★
Google Rating
10+
Years Experience
100%
Success Rate
Eco Friendly
New Zealand Wide

Roof Moss & Mould Treatment Services

We provide residential and commercial roof moss, mould, lichen removal and spray treatment services throughout New Zealand at competitive rates. Our skilled and friendly teams are available 7 days. The biocide treatment we apply acts slowly to kill any roof moss, mould and lichen, which is then washed away by rain to leave your roof clean within 6 months — with no pressure washing or water blasting required. Contact us today for a fast, free, no-obligation quote.

100% Success Rate
Fully Insured
Available 7 Days
Eco-Friendly Chemicals
Nationwide Service
Roof moss and mould treatment New Zealand
Gentle Alternative

Roof Moss & Mould Spray Treatment

Roof spray treatment is a gentle and highly effective alternative to roof washing. No pressure cleaning required. The biocide treatment we apply acts slowly to kill any roof moss, mould and lichen, which is then washed away by rain to leave your roof clean within 6 months.

In many cases treatment can be done from the side of the roof by ladder, or even from the ground — meaning our technician does not always need to walk on your roof at all. With years of experience in roof moss treatments across New Zealand, we will find the best solution for your specific roof.

No pressure washing or water blasting required
Biocide kills moss, mould and lichen at the root
Rain washes dead growth away naturally within 6 months
Can often be applied from ladder or ground level
Residential & commercial — 100% success rate
All Roof Types Covered

Works on Every Roof Type

Our biocide treatment is safe and effective across all common New Zealand roofing materials.

Terracotta & Slate

Gentle treatment safe for natural clay and stone tiles

Concrete Tile & Decramastic

Effective on textured concrete and coated metal tiles

Coloursteel & Long Run

Safe for all profiled and flat steel roofing types

Asphalt Shingles

No-pressure treatment ideal for sensitive shingle roofs

Membrane & Flat Roofs

Biocide treatment for commercial membrane roofing

Commercial & Industrial

Large-scale treatment for commercial and industrial roofs

Metro Water Blasting professional crew
Why Choose Metro

Why New Zealand Homeowners Choose Metro

From Auckland to Queenstown, homeowners and businesses across New Zealand trust Metro for roof moss treatment that is safe, effective and backed by a 100% success rate.

10+ Years Experience

Years of industry experience in roof moss and mould treatments across NZ.

Fully Trained Crews

You only get professionals on your property. No contractors, no shortcuts.

Eco-Friendly Chemicals

Safe for your kids, pets and garden. Tough on moss, mould and lichen.

Available 7 Days

We work around your schedule, not the other way around.

5-Star Rated

Hundreds of verified Google reviews from real customers nationwide.

No-Obligation Quotes

Fast, free and zero pressure.

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Customer Reviews

What Our Customers Say

Don't just take our word for it. Here is what homeowners across New Zealand say after booking Metro for roof moss treatment.

New Zealand's Roof Treatment Experts

Ready for a Moss-Free Roof?

Professional roof moss, mould and lichen spray treatment across New Zealand. 100% success rate, eco-friendly and available 7 days — free quote in minutes.

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Roof Moss Treatment NZ FAQ
Roof Moss Treatment New Zealand

Frequently Asked Questions

Everything you need to know about professional roof moss treatment, answered honestly.

Roof cleaning physically removes moss, algae, and debris from your roof surface. Roof moss treatment goes a step further by applying a specialist biocide or inhibitor solution that kills existing growth at the root level and prevents regrowth over time. The two are often done together for the best long-term result. Treatment alone is also used as a maintenance solution between full cleans to keep moss and lichen from re-establishing.
New Zealand's climate is ideal for moss and lichen growth. From the humid north to the wet west coast and cold southern winters, most New Zealand roofs are exposed to conditions that encourage organic growth year-round. Moss holds moisture against your roofing material, accelerating deterioration. Lichen physically etches into tile surfaces. Without treatment, both can significantly shorten the lifespan of your roof.
A biocide or moss inhibitor solution is applied to the roof surface using low-pressure spray equipment. The solution penetrates the moss and lichen, killing the organism at the root. Over the following weeks, dead growth breaks down naturally and is washed away by rain. For heavily affected roofs, a physical clean is recommended first to remove the bulk of the growth before treatment is applied for best results.
Most professional moss treatments provide protection for 2 to 4 years depending on the product used, the roofing material, and your local environment. Properties in shaded, humid, or heavily treed areas may see regrowth sooner. We will advise you on a realistic maintenance schedule based on your specific property and location across New Zealand.
Yes, when applied correctly by a professional. We use biodegradable, eco-friendly solutions that are safe for most roofing materials and will not harm surrounding plants, gardens, or stormwater systems when used as directed. We pre-wet surrounding vegetation before treatment and take care to protect your landscaping throughout the process. If you have specific concerns about vegetable gardens or water features nearby, let us know when you book.
No. Professional moss treatment solutions are formulated to be effective against organic growth without damaging roofing materials including concrete tiles, terracotta, metal, and asphalt. The risk of damage comes from using the wrong products or applying them at incorrect dilutions, which is why it is important to use a qualified professional rather than attempting a DIY approach with unknown chemicals.
DIY moss treatment products are available at hardware stores, but they are generally less concentrated and less effective than professional-grade solutions. There is also a real safety risk involved in accessing your roof, particularly on steeper or two-storey homes. A professional service gives you access to better products, proper application equipment, and the peace of mind that the job has been done safely and correctly.
Spring and autumn are generally the best times for roof moss treatment in New Zealand. Spring treatment targets growth that has thrived through the wet winter months, while autumn treatment protects the roof before the damp season begins. That said, treatment can be applied year-round as long as the roof surface is dry at the time of application and no heavy rain is expected for at least a few hours afterward.
Pricing depends on the size and pitch of your roof, the level of moss and lichen growth, and whether a full clean is required beforehand. We provide transparent, obligation-free quotes upfront so there are no surprises. Get in touch for a free assessment and an accurate price tailored to your specific property.
Yes, though lichen is more stubborn than moss and may take longer to break down after treatment. Lichen attaches physically to the tile surface, so in severe cases a mechanical clean may be needed alongside treatment to fully remove it. We will assess the level of lichen growth on your roof and recommend the most effective approach for your situation.
Look for a company with proper insurance, verified customer reviews, and technicians who assess your roof before quoting. Eco-friendly products, transparent pricing, and a clear explanation of the treatment method are all good signs. We are happy to answer any questions before you book and our goal is to earn your trust through the quality of our work.

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