Frequently Asked Questions
Why does my roof look the same one month after moss treatment?
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.
How long does dead moss and lichen take to fall off a roof?
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.
Does the moss fall off in big clumps and block my downpipes?
No—the dead moss typically breaks down into dust and washes away gradually, minimizing the risk of blocked downpipes.
Is moss roof treatment safe for solar panels?
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.
My roof is very steep and difficult to access. I’m concerned about safety and the cost of scaffolding. How can the product be applied in such situations?
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
My roof has been painted — is it safe to apply Moss Roof Treatment?
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.
Is a moss treatment application safe around plants and pets?
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.
What is the best time of year for moss roof treatment?
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.
I have several water tanks. Can I still get a Moss Roof Treatment done?
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.
What is the best way to get rid of moss on a roof?
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.
How much does roof moss treatment cost compared with pressure cleaning?
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.
How do I get rid of moss on my roof without damaging shingles?
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.
How long does it take for moss killer to work?
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.
Does moss on roof cause damage?
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.
Why is moss growing on my roof?
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.
How long has Moss Roof Treatment been operating?
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.
How many roofs has Moss Roof Treatment treated?
We have completed over 3000+ moss treatments across Victoria. Most being located in Melbourne, Ballarat and Geelong areas.
Why should I choose Moss Roof Treatment instead of a general roof cleaner?
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.
Is Moss Roof Treatment a registered trademark?
Yes, Moss Roof Treatment is a Registered Trademark, our product is also specially made, and has been tested and proven.
Is your product a dangerous solution?
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.
Will the treatment damage gutters, downpipes or painted surfaces?
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.
Is your moss roof treatment safe for Colorbond roofs?
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.
Can pressure cleaning damage roof tiles?
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.
What happens if the moss does not die?
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.
Do you guarantee your moss roof treatment?
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.
What areas do you service?
Moss Roof Treatment services far and wide across Victoria. We mainly service Melbourne, Geelong, Ballarat, Hamilton, Warrnambool, Mornington Peninsula and the Bellarine Peninsula.
Do you provide moss roof treatment in Melbourne?
Yes, we service all suburbs across Melbourne.
How do you guys quote for moss treatments?
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.
