# Roof Moss Treatment Rotorua | Rotorua Gutter Cleaning > Roof moss treatment and roof cleaning in Rotorua. Soft wash with clean hot water, no abrasive high-pressure blasting. Bundle with gutter clearing and save. URL: https://rotoruaguttercleaning.co.nz/roof-moss-treatment/ Roof Preservation # Hot-Water Soft Wash Roof Treatment for Moss, Mould & Lichen Last updated: 2 November 2026 Rotorua's rainfall, shade and lake-edge humidity let moss, mould and lichen take hold fast. Our roof treatment uses soft wash techniques with clean hot water rather than abrasive cold-water high-pressure blasting. - Clean hot water, low pressure - No abrasive cold-water blasting - Iron, concrete tile and Decramastic - Bundle with a gutter clear and save Get a Free Quote [#quote →](#quote) 020 4121 5973 [tel:+642041215973 →](tel:+642041215973) **4.9-5.0** on Google & NZ directories Free, no-obligation quotes ![Concrete tile roof in Rotorua part-way through a soft wash moss and lichen treatment](/images/misc/grey-concrete-tile-roof-on-a-rotorua-house-half-tr.webp) Fully insured Documented H&S policy 0 People on your roof 3 storeys Ground vacuum reach (~12 m) 5+ years Serving the Central North Island 4.9-5.0 Average star rating ## What Is Roof Moss Treatment? Ever looked up and wondered when your roof turned green and black? In Rotorua, it happens faster than most people expect. Roof moss treatment removes the moss, mould and lichen that build up on your roof over time. According to weather-and-climate.com, Rotorua gets about 1,389 mm of rain a year. Add shaded sections and lake-edge humidity, and roofs stay damp for long stretches. That’s exactly what moss and lichen need. If you own a rental, a taller house or a multi-level building, getting up there yourself isn’t worth the risk. That’s where we come in. We use **soft wash technology**: a low-pressure rinse delivered with clean hot water. It lifts growth off the surface without the brute force of cold-water high-pressure blasting. High pressure can: - Strip coatings - Crack tiles - Push water under the laps of your roofing ![Low-pressure hot-water soft wash rinsing moss from a longrun iron roof](/images/content/low-pressure-hot-water-soft-wash-wand-rinsing-moss.webp) ## Why Does Moss and Lichen Matter? Each type of growth harms your roof in its own way. Here’s what we see most often around Rotorua: - **Moss** works like a sponge. It holds water against the roof surface long after the rain stops, which breaks down paint and coatings and keeps fixings wet. - **Lichen** is slower but tougher. Its **thallus** sits on the surface while tiny **rhizoids** grip into it. - **Black algae** causes the dark streaking on many roofs. It’s often Gloeocapsa magma, which feeds on moisture and minerals and spreads across shaded faces. Strictly speaking, it’s a cyanobacterium rather than a true alga, but most people call it algae. On Decramastic tiles, lichen can mean chip loss over time. Promain Roofing, a New Zealand roof painting company, says moss and lichen erode Decramastic roof paint. Left alone, bare metal can show through and start to rust. All of it ends up in your spouting eventually. Clumps of moss and grit wash down with every downpour and block the outlets. That’s why we finish every roof treatment with vacuum gutter clearing [/ →](/) and a full downpipe flush. If you’re weighing up how urgent your moss is, our guide Is moss damaging my roof? [/guide/is-moss-damaging-my-roof/ →](/guide/is-moss-damaging-my-roof/) walks through the warning signs. ## Which Roofs Can We Treat? We treat the three most common roof types around Rotorua. Each one needs a slightly different touch. | Roof type | Risk from high pressure | How our soft wash helps | | --- | --- | --- | | Longrun iron and Colorsteel | Scours the paint finish | Cleans the ribs and laps without scouring the finish | | Concrete tiles | Cracking risk on porous tiles | Cleans the surface and laps without the cracking risk | | Decramastic tiles | Can strip the stone-chip coating | A gentle method designed for stone-chip roofs | ### Longrun iron and Colorsteel **Longrun corrugated iron** and Colorsteel roofing are common across Rotorua. A low-pressure hot-water wash cleans the ribs and laps without scouring the paint finish. Resene’s roofing guides say a Colorsteel roof in good condition mostly needs a thorough wash. Gentle cleaning protects the finish you already have. ### Concrete tiles **Concrete roof tiles** are porous, and moss loves them. Soft washing cleans the surface and the laps between tiles without the cracking risk that comes with high pressure. ### Decramastic tiles Decramastic tiles have a stone-chip coating that high pressure can strip. Our gentle method is designed for exactly this kind of roof. If you’re planning to paint the roof afterwards, a clean surface matters. Talk to your painter about **roof coating and paint compatibility**, such as the Resene system they plan to use. Resene’s roof painting guides call for moss and mould to be treated with their Moss & Mould Killer before painting, so it pays to check the order of work. We’ll fit the treatment around your painter’s timing. ## Tank Water and Moss Inhibitor Do you collect rainwater? Then your tank needs protecting while we work. On properties that collect rainwater, we **disconnect the tank downpipes** before we start. Once the roof has been rinsed, we reconnect them. Kiwicare, the New Zealand outdoor cleaning brand, gives the same advice for any roof that feeds a tank: disconnect during cleaning and rinse thoroughly before reconnecting. If you’d like to talk about a **moss inhibitor** to slow regrowth, we can discuss what suits your roof at the free quote. Whether you own a rental, a two-storey home or a multi-level building, the next step with your roof moss treatment is easy. Book your free quote and we’ll take a look. Free Quotes ## How Much Does Roof Moss Treatment Cost in Rotorua? Quoted on roof area, pitch, material, growth severity and access. Free quotes; bundling with gutter clearing reduces the overall cost. ### Roof area The size of the roof and how many faces need treating. ### Pitch & material Steep or low pitch, and whether it's longrun iron, concrete tile or Decramastic. ### Growth severity A light green film takes less time than thick moss cushions and old lichen. ### Access How easily we can set up safely around the house, trees and outbuildings. Bundling a gutter clear with a roof moss treatment or house wash usually reduces the overall cost. Get a Free Quote [/contact/ →](/contact/) Read our cost guide [/guide/gutter-cleaning-cost-bay-of-plenty/ →](/guide/gutter-cleaning-cost-bay-of-plenty/) Why Choose Us ## Why Choose Rotorua Gutter Cleaning for Roof Moss Treatment? Safety-minded local owner-operators who explain the problem plainly and show you the result. ### Gentle on coatings Cold high-pressure blasting can strip paint, crack tiles and force water under laps. Soft washing avoids that. ### Hot water, not harsh shortcuts Clean hot water does the heavy lifting, so the roof is cleaned without abrasive force. ### Gutters done in the same visit Moss that comes off the roof ends up in the spouting. We clear it and flush the downpipes so it doesn't block them. ### Suits common NZ roofs Longrun corrugated iron and Colorsteel, concrete tiles and Decramastic tiles are all part of our everyday work. ### Tank-water aware On rainwater tank properties we disconnect tank downpipes during treatment. ### Bundle and save Roof treatment plus a vacuum gutter clear is our most common bundle and usually lowers the total. Our Process ## How Does Our Roof Moss Treatment Work? Clear steps from quote to final check, Monday to Friday. 1. 1 ### Free quote We look at your roof type, pitch and how heavy the growth is, then quote clearly. 2. 2 ### Protect & prepare Rainwater tank downpipes disconnected where needed, and plants and paths noted before we start. 3. 3 ### Soft wash Moss, mould and lichen lifted with a low-pressure, clean hot-water soft wash. No abrasive blasting. 4. 4 ### Clear the gutters Treatment washes debris down, so we clear the spouting and flush the downpipes afterwards. 5. 5 ### Final check We reconnect tank downpipes, tidy up and talk you through what to expect as the roof dries. Our Work ## Our Roof Moss Treatment Work Click any photo to see it larger. ## Not sure what your property needs? Get an honest assessment and a free quote. No obligation, no pressure. 020 4121 5973 [tel:+642041215973 →](tel:+642041215973) Get a Free Quote [/contact/ →](/contact/) ## Try Our Free Gutter Cleaning Frequency Calculator Find out how often your spouting should be cleared based on tree cover and local conditions, and whether you're overdue. Use the Free Calculator [/tools/gutter-cleaning-frequency-calculator/ →](/tools/gutter-cleaning-frequency-calculator/) Customer Proof ## What Customers Say About Our Roof Moss Treatment Rated 4.9-5.0 stars across Google and NZ directories like Trust Local and Cybo. > "Booked a gutter clear and roof moss treatment together and it worked out cheaper than doing them separately. The roof looks years younger." HTHemi T.Ngongotahā > "Two-storey house under big trees and I was dreading getting the ladder out. They cleared every gutter from the lawn, flushed the downpipes and left the deck spotless." KWKaren W.Lynmore, Rotorua > "I manage several rentals and safety matters. Nobody went on the roofs, the quote was clear, and the downpipe flushing fixed a soak hole that kept overflowing." DPDaniel P.Property manager, Rotorua 4.9-5.0 average rating · Google & NZ directories (Trust Local, Cybo) Got Questions? ## Roof Moss Treatment FAQs How much does roof moss treatment cost in Rotorua? Roof treatments are custom-quoted for free based on roof area, pitch, material, how heavy the growth is, and access. Bundling with a vacuum gutter clear generally reduces the overall project cost. Do you water blast roofs? No. We use soft wash techniques with clean hot water instead of abrasive cold-water high-pressure blasting, which can strip coatings, crack tiles and force water under laps. Which roof types can you treat? Our low-pressure hot-water method suits common NZ roofs including longrun corrugated iron and Colorsteel, concrete tiles and Decramastic tiles. Do you treat roofs in Mamaku? Yes. Mamaku sits on the plateau above Rotorua where it is cooler and wetter, so moss and lichen grow faster. Many properties are on tank water, so we disconnect tank downpipes during treatment. Why clear the gutters after a roof treatment? Moss, lichen and grit loosened from the roof wash down into the spouting. Clearing the gutters and flushing the downpipes afterwards stops that material blocking the outlets in the next heavy rain. Is moss on my roof actually a problem? A little moss is low urgency, but it holds moisture against the roof, breaks down coatings over time and feeds gutter blockages. Treating it early is usually simpler and cheaper than waiting. ### Still have a question? Call us or send a quick message. We reply Monday to Friday, 8am-5pm. 020 4121 5973 [tel:+642041215973 →](tel:+642041215973) Get a Free Quote [/contact/ →](/contact/) Guides ## Roof Moss Treatment Guides Read more before you book. Practical answers from our team. ![Thick moss growing along tile laps on an older NZ roof](/images/featured/thick-green-moss-growing-along-the-tile-laps-of-an.webp) Guide ### Is Moss Damaging My Roof? Risks to Iron, Tiles and Spouting How trapped moisture from moss degrades coatings, tiles and fixings, how it washes into spouting and blocks downpipes, and the signs that it's urgent. Read guide [Is Moss Damaging My Roof? Risks to Iron, Tiles and Spouting →](/guide/is-moss-damaging-my-roof/) Bundle & Save ## Bundle With Other Services Bundling services in one visit usually lowers the overall cost. ### Vacuum Gutter Clearing Ground-based vacuum clearing up to 3 storeys, with every downpipe flushed to the soak hole. How it works [Vacuum Gutter Clearing →](/#how-it-works) ### Gutter Repairs Fixing sagging, leaking or storm-damaged spouting, joints and brackets before water gets into your fascia and walls. Learn more [Gutter Repairs →](/gutter-repairs/) ### House Washing Full exterior hot-water washing that removes dirt and organic growth from siding and walls without peeling paint. Learn more [House Washing →](/house-washing/) Free Quote ## Get a Free Roof Moss Treatment Quote Tell us about your property and we will come back to you with a clear quote. Every quote is free. - Nobody on your roof, ever - Clear quote factors, no surprises - Bundle services in one visit and save Prefer to talk? Call 020 4121 5973 [tel:+642041215973 →](tel:+642041215973) Mon - Fri: 8:00 AM - 5:00 PM Free No-Obligation Quote ## Request a Free Quote Thanks, we got your message. We'll be in touch Monday to Friday, between 8am and 5pm. No obligation. We reply Monday to Friday, 8am-5pm. ![](/images/hero/clean-colorsteel-roof-and-tidy-spouting-on-a-rotor.webp) ## Ready to Book Roof Moss Treatment? Removal of moss, mould and lichen from roofs using a soft wash with clean hot water instead of abrasive cold-water blasting. Call our Rotorua team or request a free quote online. Call 020 4121 5973 [tel:+642041215973 →](tel:+642041215973) Get a Free Quote [/contact/ →](/contact/) - Free, no-obligation quotes - Fully insured - Mon-Fri, 8am-5pm