Why clean your roof?
It’s about far more than looks — a clean roof lasts longer, drains properly and stays leak-free. Here’s what roof growth is really doing up there.
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Cleaning your roof removes the moss, lichen and algae that trap moisture against the tiles and quietly accelerate deterioration. In Perth a roof clean costs $5/m² and includes flushing the gutters — cheap insurance against rot, leaks and a shortened roof life, and the essential first step of any restoration.
What roof growth is actually doing
That green and black growth spreading across a roof isn’t just an eyesore. Moss and lichen are living organisms that hold water like a sponge, keeping the tile surface permanently damp. On a coated roof that means the coating breaks down faster; on bare tile it means the tile stays porous and slowly deteriorates.
Lichen is the worst offender — it puts down root-like structures that work into the surface of the tile and the joints between them, physically breaking down the material over time. Left for years, what started as a cosmetic problem becomes a structural one.
Moisture is the enemy of every roof
Almost every roof problem traces back to moisture sitting where it shouldn’t. Growth that holds water against the surface, blocked valleys, and clogged gutters all keep the roof wetter for longer, and a permanently damp roof degrades far faster than one that dries out between rains.
This is why cleaning matters beyond appearance. Stripping off the moss and lichen lets the roof shed water and dry as it’s designed to, which directly extends the life of the tiles and any coating.
Gutters are part of the job
A roof clean that ignores the gutters is only half done. Blocked gutters overflow, push water back under the roof edge, and rot fascias and eaves. That’s why our roof cleaning at $5/m² includes cleaning and flushing the gutters and downpipes as standard — no separate gutter cleaning charge on top — and we leave the ground clean and tidy afterwards.
Perth’s shaded and bushland suburbs need it most
Roof growth isn’t evenly spread across Perth. Shaded, tree-lined and bushland suburbs — Kalamunda, Roleystone, Mundaring, Gooseberry Hill and the like — get far heavier moss and lichen because the roof stays damp and shaded for longer. Coastal and open suburbs fare better but still collect salt, dust and airborne grime.
As a rule of thumb, a clean every few years keeps most Perth roofs healthy, sooner in the shady suburbs. And if you’re considering a restoration, the clean is already the first stage — so you’re not paying for it twice.
What a clean will and won’t fix
It’s worth being clear about what roof cleaning does. A clean removes the growth and grime and lets the roof dry and breathe — it protects a sound roof and refreshes its look. What it won’t do is fix a faded coating, cracked tiles or failing capping; those need a full restoration. So if your roof is simply dirty, a clean is all it needs. If cleaning reveals faded colour or damaged caps underneath, that’s the moment to consider restoring — and the clean you’ve just had becomes stage one of that work rather than money spent twice.
Frequently asked questions
How often should I clean my roof in Perth?
Every few years for most homes, and more often in shaded, tree-lined and bushland suburbs where moss builds up quickly.
Does roof cleaning include the gutters?
With Powerdrive, yes — our $5/m² roof clean includes cleaning and flushing the gutters and downpipes.
Can I pressure clean my own roof?
It’s risky — wrong pressure or technique cracks tiles or forces water under them, and roof access is dangerous. A professional does it safely.
Does a dirty roof really shorten its life?
Yes — moss and lichen hold moisture against the surface and break it down over time, so regular cleaning genuinely extends roof life.
Get a free quote → or call 0421 768 842. Backed by a 10-year workmanship and 15-year Dulux AcraTex paint warranty.