Frequently Asked Questions

Results aren’t instant — the treatment kills moss, mould, and lichen within 1-2 weeks, but the growth takes 12–18 months to naturally break down and wash away. If your roof looks the dull and the growth looks yellow / brown, that’s normal and means the treatment is working.

Once treated, moss and lichen are dead and will naturally weather away with each rainfall, gradually revealing a cleaner roof. Over 12–18 months, your roof keeps improving in appearance as nature gently does the cleaning for you.

No—the dead moss typically breaks down into dust and washes away gradually, minimizing the risk of blocked downpipes.

Yes — moss treatments are safe for solar panels and help prevent moss and lichen from shading or damaging them. The treatment works on the surface without harming the panels, keeping them cleaner and more efficient over time.

Yes, one of the key advantages of this product is that it can be safely and effectively applied from ladders or mobile working platforms—eliminating the need for costly scaffolding. Using a medium-pressure spray system, the product can be accurately applied from a distance, reaching even the steepest or most difficult-to-access roof areas with ease.

Yes, it a safe product. As an added precaution, we like to hose down any plants and other areas where overspray may have occurred. Fish Ponds and Veggie gardens we do like to have covered as an added precaution.

Our Moss Roof Treatment can be applied year-round, and it’s best to treat moss and spores as soon as possible to prevent further growth and potential damage. For optimal results, we make sure the application is done on low wind days and little to no rain forecast for at least 4-6 hours. This ensures the product adheres properly and has sufficient time to penetrate and take effect.

Yes - We recommend diverting your downpipes from water tanks for at least 3 weeks after treatment—or until there’s been 10mm of rainfall—to ensure your gutters are fully flushed. For drinking water tanks, we advise extending the diversion period as an added precaution.

Applying a Moss Roof Treatment to roof surfaces it the best way to remove moss, mould and lichen from the roof and prevent new regrowth from occurring. This is the safest way without damaging the roof surface, which pressure cleaning can cause.

Moss Treatments tend to be half the price of pressure cleaning on average. It does depend on the size of the roof and access. Requesting a quote is the best way to get an accurate price.

Kills moss, mould & lichen within 2-3 weeks, and thenw e allow 12-18 months on average for all dead growth to be gone, leaving a clean roof.

All roofs are susceptible to moss growth, but moss is particularly common to damaging tiled roofs. If left unchecked, it can lead to a number of long-term issues. Not only will moss make your roof look quite unsightly, it can also cause leaks, tile deterioration and eat into iron/colorbond sheets.

Moss, mould, algae and lichen grow on your roof through a combination of two things: moisture and organic debris. The more water and the more debris, the greater the chance of moss growth. Another critical factor is the amount of shade your roof receives.

We have 30+ plus years experience working in the roofing industry, with a background of roof restorations and repairs. Now, we just focus on moss treatments and roof cleaning.

We have completed over 3000+ moss treatments across Victoria. Most being located in Melbourne, Ballarat and Geelong areas.

We have been in the roofing industry for 30+ plus years and have extensive knowledge of all roof surfaces. We have always used the best products with the best equipment to get the job done effectively whilst maintaining quality. We also guarantee our moss treatment for 3 years.

Yes, Moss Roof Treatment is a Registered Trademark, our product is also specially made, and has been tested and proven.

No, Our Moss Treatment product is water-based, biodegradable, non-acidic, non-caustic, PH neutral & non-corrosive. It can be applied to all roof surfaces safely.

If something does occur to cause the moss or lichen to not die, as part of our 3 year warranty we will comeback and reapply the treatment free of charge.

Yes, We guarantee our moss treatment for 3 years, that there will be no new green moss or lichen regrowth. If this does occur we will comeback and respray these areas free of charge.

Moss Roof Treatment services far and wide across Victoria. We mainly service Melbourne, Geelong, Ballarat, Hamilton, Warrnambool, Mornington Peninsula and the Bellarine Peninsula.

Yes, we service all suburbs across Melbourne.

We use satellite imagery program which gives the ability to measure out the roof area, we can then provide a free online quote very quickly, making it a convenient process. We do onsite inspections where required as well.

Not always. The way we access and treat a roof depends on the roof design, pitch, height and surrounding access. Where possible, we minimize the amount of walking required on the roof. Some roofs can be treated from ladders, access points or other suitable positions, while others may require limited roof access to achieve complete coverage. Before starting, we assess the safest and most practical way to treat the entire roof.

A small amount of rain after the treatment has had time to settle is generally not a problem. However, heavy rain immediately after application can dilute or wash some of the treatment from the roof before it has had enough time to work. We monitor weather conditions when scheduling treatments and avoid applying the product when significant rain is expected too soon after application.

Rainwater tanks should be disconnected or diverted during the moss treatment process so the treatment does not enter your stored rainwater. The roof should then be allowed to receive sufficient rainfall to rinse and flush the treated surfaces before the tank is reconnected.

A properly treated roof should remain free from active moss and lichen for a considerable period, although the exact time can vary depending on surrounding trees, shade, moisture, roof orientation and local conditions. Moss Roof Treatment includes a 3-year guarantee against regrowth. If new green moss or lichen regrowth occurs within the guarantee period, subject to the terms of the guarantee, we will return and re-treat the affected areas.

Yes. We can provide moss and lichen treatment for strata, owners corporation and body corporate properties, including townhouses, villas, apartment developments and other multi-unit sites.

Yes! It is safe to apply our moss treatment to Colorbond and Iron roof surfaces. It is our 2nd most common roof surface to treat behind terracotta tiled roofs. Soft washing and moss treatments are the best method to remove moss and lichen spores and the stubborn stains without damaging the surface.

Yes — Moss Roof Treatment is safe to use on painted roofs. It won’t disturb the paint surface, but it will effectively kill and prevent moss, mould, and lichen growth so your roof stays cleaner for longer.

No, definitely not! In fact, if there is any moss, mould, lichen, mildew or algae growing on the areas the treatment will kill the growth and clean the area. Meaning the product is useful for cleaning concealed areas like gutters and downpipes. It is also highly recommended for painted surfaces, as pressure cleaning can damage the roof coatings, leaving the roof looking faded and patchy.

To safely remove moss from slate tiles or shingles without causing damage, we recommend using a specialist Moss Roof Treatment. These delicate tiles are brittle and can easily crack or break if walked on or exposed to high-pressure cleaning, so a gentle chemical treatment is the safest and most effective solution.

Yes, it can chip away at the terracotta or cement tile. It can also damage the roof mortar and pointing, meaning an additional cost to repair these areas. Plus the risk of water egress into the roof cavity.

No. Moss Roof Treatment is suitable for terracotta roof tiles and is designed to kill moss, lichen and organic growth without the aggressive pressure cleaning that can damage or disturb older tiles. The treatment is applied to the roof and allowed to work gradually. Over time, weather and rainfall help remove the dead moss and lichen naturally, reducing the need for high-pressure cleaning or excessive walking on the roof.