Roof Cleaning in Cairns
Cairns humidity grows things on roofs. Moss on shaded southern faces, lichen crusted onto tile edges, algae streaking down metal sheeting and mould in the valleys where leaf litter sits. It is not only a cosmetic problem: lichen holds moisture against the roof surface long after the rain stops, and permanent damp is exactly what starts corrosion on metal and degrades mortar on tile.
Wet season now
Wet season is here — book a roof check before the next downpour
Monsoonal bursts find every failed flashing and undersized gutter. A free inspection now means the problem is found before water is in your ceiling.
- Free On-Site Roof Inspection
- Storm & Cyclone Priority Response
- Written Fixed-Price Quotes
- No Call-Out Fees
- Locally Focused Service
The other half of roof cleaning is drainage. Leaf litter from the dense vegetation around most Cairns suburbs blocks valleys and gutters, and blocked drainage is one of the most common leak causes we attend during the wet season. Cleaning the roof surface without clearing the valleys and gutters solves the appearance and leaves the risk in place.
We clean at a controlled pressure suited to the roof type, treat biological growth rather than just blasting it off, and photograph anything we find underneath — because a clean roof is also the first time you can see the real condition of the surface.
What this service covers in Cairns
Moss, lichen and algae removal
Biological growth is softened and treated so it releases rather than being driven into the surface, then washed off at a pressure the roof can take. Treating rather than only blasting slows regrowth, which matters in a climate this humid.
Controlled-pressure washing
Pressure is set to the substrate: tiles tolerate more than aged painted metal, and old brittle tiles or a thin coating can be damaged by an aggressive wand. We adjust technique per roof rather than using one setting everywhere.
Mould and stain treatment
Shaded sections, sections under overhanging trees and north-facing walls below the gutter line all stain. We treat mould and dark streaking, and tell you honestly where staining has etched in permanently and only coating will change the appearance.
Gutter, valley and downpipe clearing
Debris removed from gutters and valleys, downpipes flow-checked and rainwater heads cleared. This is the part that prevents wet-season overflow leaks, and it is included in every clean we do.
Post-clean condition report
With the growth gone we photograph the exposed surface: cracked tiles, perished pointing, surface rust, failed sealant and any repair that needs attention. You get the photos whether or not you ask us to do the repair.
Quick checklist: warning signs to look for
- Moss or lichen crusted across shaded roof sections
- Dark algae streaking down sheeting or walls below the gutter
- Gutters and valleys packed with leaf litter
- Water overflowing the gutter line during heavy rain
- You want the real roof condition seen before quoting repairs
Why roof cleaning matters more in the wet tropics
In a dry climate a mossy roof is mostly an appearance issue. In Cairns it is a moisture-retention issue. Lichen and moss act like a sponge on the roof surface, keeping it damp between rain events instead of letting it dry out, and that constant damp accelerates corrosion on metal and breaks down mortar bedding on tile.
Organic growth also lifts and holds debris. Once leaf litter is trapped against a valley or behind a lichen crust it stops water moving, and standing water on a roof always finds a way in eventually — usually at a lap, a fixing or a valley fold.
Cleaning is also the cheapest form of inspection. Nothing reveals the real condition of a roof like removing everything that was hiding it.
- Moss and lichen holding permanent moisture on the surface.
- Blocked valleys and gutters causing wet-season overflow leaks.
- Algae streaking on metal sheeting and rendered walls below.
- Debris from surrounding rainforest vegetation and palms.
- Mould in shaded roof sections and behind solar panels.
Roof cleaning as the first step before coating
If you are planning to paint, seal or restore a roof, cleaning is not optional — it is the step that decides whether the coating lasts. Coatings applied over lichen residue, salt or chalky oxidised paint lift from underneath within a couple of seasons, and no product claim changes that.
Where cleaning is a precursor to restoration we prepare the surface to a standard the coating system requires, including rust treatment on metal and rebedding or repointing on tile. If you only want the clean for now, that is fine too — we will tell you what the roof will need later.
How this job runs
- 1
Send a photo of the growth
Moss, lichen or black staining each respond differently, so a photo helps us plan the clean.
- 2
Choose the pressure
We set the pressure and treatment to suit the roof, so old paint and soft tiles are not damaged.
- 3
Clean top down
The roof is treated and washed, with gutters and valleys cleared as we work so that drains stay open.
- 4
Report what the clean reveals
Cracks or rust hidden under growth are photographed, so you can decide what to do next.
How this differs by roof type
Metal and Colorbond
Lower pressure on aged painted metal, and salt flushed from laps on coastal roofs.
Tile
Growth is treated so it releases rather than being driven into porous tile surfaces.
Queenslander tin
Old, thin sheeting and brittle fixings need a gentle approach and careful foot traffic.
- Cairns-Focused ServiceLocal trades for local roofs
- Cause Found FirstSource traced before quoting
- Written Fixed-Price QuotesItemised, in writing, before work
- Photographed FindingsYou see what we see on the roof
- No Call-Out FeesFree inspection across the region
Related guides worth reading first
Wet season roof checklist
What to check before the monsoon bands arrive.
Read the guideWhat a roof inspection includes
The full checklist and what you receive in writing afterwards.
Read the guideColorbond corrosion in salt air
Why coastal roofs age faster and which fixings to insist on.
Read the guideWhat roof repair involves in Cairns
How repairs are scoped and quoted here, and what changes the scope.
Read the guideRoof Cleaning — Questions Cairns Homeowners Ask
Will pressure washing damage my roof?
Not at the right pressure and angle. Aged painted metal, brittle old tiles and previously coated roofs need a gentler approach than modern concrete tile, and we set up accordingly. Where a surface is too fragile to wash safely we say so before starting.
How often should a Cairns roof be cleaned?
More often than in southern cities. Properties surrounded by dense vegetation or shaded for much of the day can need attention every year or two; open, sunny roofs go longer. Gutter and valley clearing should happen before each wet season regardless.
Does roof cleaning stop leaks?
It stops the leaks caused by blocked valleys and overflowing gutters, which is a real proportion of the wet-season leaks we attend. It does not fix failed flashings, corroded valleys or cracked pointing — but it does expose them so they can be quoted.
Will the growth come back?
In this climate, eventually. Treating the growth rather than only washing it off slows regrowth considerably, and trimming overhanging branches to let sunlight onto the roof helps more than any product.
Free Inspection, Written Fixed-Price Quote
Tell us what is growing on the roof and whether you have tile or metal. We will quote a clean that is safe for that surface.
Book Your Free Cairns Roof Inspection
Clear the moss, lichen and mould, and see what is underneath.