Moss and lichen can make a roof look tired, but the bigger issue is the damage they can cause over time. In damp, shaded parts of Australia, growth can hold moisture against roofing materials, lift surface coatings, and make tiles or metal roofing more slippery and harder to inspect. The good news is that you can deal with it safely if you take the right approach and know when to call in a professional.
Why Moss And Lichen Should Be Removed
Moss and lichen are more than just a cosmetic problem. On tiled roofs, growth can creep into overlaps and hold water where it does not belong. On Colorbond or other metal roofs, organic growth can trap dirt and moisture, which may speed up coating wear if left untreated. Around valleys, gutters and shaded ridges, buildup can also block drainage and make leaks harder to spot.
In many parts of Australia, winter damp, coastal salt air, heavy tree cover and south-facing roof planes make moss and lichen more common. If you see thick patches, cracked tiles, or staining after rain, it is worth acting sooner rather than later.
Safe Ways To Remove Roof Growth
For most homeowners, the safest first step is a ground-level inspection. Use binoculars or take photos from a safe spot rather than climbing up just to have a look. If the roof is steep, fragile, wet, or more than one storey up, leave the work to a licensed and insured roofer.
If you do decide to handle minor surface growth yourself, keep the job low risk:
- Use a stable ladder only if it is appropriate for the task and set up correctly on level ground.
- Wear non-slip shoes, gloves and eye protection.
- Do not work on a wet, windy or extremely hot day.
- Stay off brittle roof materials and never step on skylights, fibro, or visibly damaged areas.
- Use a roof-safe cleaning product and follow the label instructions carefully.
A soft-bristle broom or low-pressure rinse can help after treatment, but avoid harsh scrubbing that can damage tiles, protective coatings or pointing. Never use a high-pressure washer on a roof unless the manufacturer specifically allows it and the job is being done by someone who knows how to protect the surface.
What To Avoid
- Bleach-heavy mixes that can harm plants, gutters and some roof materials if used incorrectly.
- Acidic cleaners on metal roofing or painted surfaces.
- Walking on a roof without training, fall protection or a safe access setup.
- Scraping away growth with metal tools, which can chip tiles and coatings.
Choosing The Right Method For Your Roof
Different roofs need different approaches. If you are not sure what your roof is made from, check the product documentation from the manufacturer or ask a roofer before applying anything.
| Roof Type | Best Approach | Watch Out For |
|---|---|---|
| Concrete or terracotta tiles | Soft removal, then a roof-safe treatment to slow regrowth | Broken tiles, loose ridge capping, brittle mortar |
| Colorbond or other metal roofing | Gentle cleaning and a suitable treatment approved for painted metal | Scratching the coating, using harsh chemicals, damaging screws or seals |
| Asbestos cement roofing | Do not clean it yourself | Disturbing asbestos is dangerous and must be handled by licensed professionals following Australian requirements |
If your home has solar panels, avoid brushing growth around cabling or mounting points. Any electrical issues, damaged wiring or disconnected equipment must be handled by a licensed electrician.
When To Call A Roofer Or Specialist
Some jobs are best left to an experienced Australian roofer. Call a professional if the roof is steep, slippery, high, or showing signs of damage; if there is mould, persistent leaks or blocked drainage; or if the growth is widespread and keeps coming back. A roofer can inspect flashings, ridge capping, fasteners, gutters and underlay, not just the visible growth.
In Australia, certain related work is legally restricted. Electrical work must be done by a licensed electrician, gas work by a licensed gas fitter, and plumbing by a licensed plumber where required. If roof maintenance uncovers anything in those areas, stop and book the right trade.
How To Prevent Moss And Lichen Returning
Once the roof is clean, prevention makes a big difference. Trim back overhanging branches to let in more sunlight and airflow. Keep gutters clear so water can drain properly. Have your roof inspected after severe weather, especially if your area has had heavy rain, hail or high winds.
Regular maintenance is often the simplest fix. A routine visual check from the ground, plus an occasional professional inspection, can help catch small problems before they become expensive repairs. Ask about roof treatments that are suitable for your roof material and the Australian climate in your area, whether you are in a humid coastal suburb, a leafy inland street, or a hot, dry region.
If you are comparing service providers, look for a business that is properly insured, experienced with your roof type, and familiar with Safe Work Australia guidance and the National Construction Code. Paint and coating advice from brands such as Dulux, Taubmans and British Paints can also be useful when you are trying to protect finishes on associated surfaces like eaves and gutters.
For more trade tips and a wider directory across the ditch, you can also visit Trade Directory NZ.
Need a safe, proper clean or roof inspection? Find qualified local roofers on Aussie Trade Directory and get the job done right.