Frequently Asked Questions
It’s been a month since my roof was treated and it looks the same, is this normal?
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.
Why does the dead lichen and moss take so long to fall off my 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.
Are Moss Treatments suitable and 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 to apply the 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.
How do I get rid of moss on my roof?
Applying a Moss 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, which pressure cleaning can cause.
How much does it cost to high pressure clean your house roof?
If you need to have moss removed from your house roof, expect to pay between $1500.00 to $2500.00 for an average three bedroom house depending on accessibility, roof pitch, safety required on roof and type of roof surface. However, pressure cleaning can cause damage to older tiles, remove mortar/pointing and remove colour and powder coatings from roof sheets. If you do get a pressure clean, it is best to but a moss treatment product on afterwards to prevent new regrowth from occurring.
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.
