Kills moss, lichen and gloeocapsa magma at the root, not just the surface
Roof Treatment
Greater BrisbaneTreat the roof. Don't belt it.
Roof treatment is a chemical soft-wash application that kills moss, lichen and gloeocapsa magma at the root using a controlled sodium hypochlorite solution. It's not the same as roof cleaning — there's no pressure wash and no instant transformation, but the growth dies off and weathers away over the following months, staying gone for 2 to 4 years.
Kills moss, lichen and gloeocapsa magma at the root, not just the surface
No pressure washing — safe on brittle terracotta, concrete tile and Colorbond
Manufacturer-compliant application rates that won't void your roof warranty
Dead growth bleaches out and weathers away naturally over 6 to 12 weeks
Roof Treatment
Designed for the way Brisbane homes weather.
Built for how our climate actually treats your walls, roof and glass. Not a generic pressure clean.
What's Included
Every visit. Every time.
A fixed scope written into your quote. No add-ons on the day.
No pressure washing — safe on brittle terracotta, concrete tile and Colorbond
Manufacturer-compliant application rates that won't void your roof warranty
Dead growth bleaches out and weathers away naturally over 6 to 12 weeks
2 to 4 year regrowth-free durability when applied correctly
Ideal for shaded south-facing roofs, or before a re-coat or repaint
The Brief
Everything worth knowing.
Straight answers, no fluff. Read what applies to your home — skip what doesn't.
What roof treatment actually is
Roof treatment is a chemical kill treatment, not a wash. We apply a diluted sodium hypochlorite solution at the correct strength for your roof material, which penetrates moss, lichen and gloeocapsa magma (the black algae behind those grey-black streaks) and kills the organism at the root — including the spores sitting in the tile surface that you can't see.
How it's different from roof cleaning
Roof cleaning is a physical, low-pressure wash that gives you an immediate visual result — the roof looks clean the day we leave. Roof treatment is chemical and biological. The roof can still look patchy or grey on the day of application because the moss and lichen are dead, not removed. Rain, wind and UV do the physical removal over the following weeks.
Why we don't pressure wash for this
High-pressure washing strips the granule coating off concrete tiles and can crack aged terracotta, and it does nothing about the spores embedded below the surface — moss comes back within a year. A soft-wash chemical application leaves the tile surface intact and gets to the root of the growth, which is why it lasts years longer than a pressure clean.
What happens after application
Within a few days the moss and lichen start turning brown or grey as they die off. Over the next 6 to 12 weeks, wind, rain and sun break down the dead material and it washes off the roof naturally. By the 3-month mark most roofs are visibly clear, with the heaviest growth areas taking a little longer.
Why sodium hypochlorite, and why dilution matters
Sodium hypochlorite is the industry-standard biocide for roof moss and algae because it kills spores as well as visible growth, unlike surface detergents. Getting the mix ratio right matters — too weak and it won't kill the root system, too strong and it can bleach Colorbond paintwork or degrade sealants. We mix to the roof material and growth severity, not a one-size-fits-all rate.
Warranty-safe, manufacturer-compliant application
Roofing manufacturers including BlueScope (Colorbond) and major tile makers have documented cleaning and treatment guidelines, and using the wrong chemical concentration or method can void your roof warranty. We apply within manufacturer-compliant dilution and rinse rates, so your treatment doesn't put your roof warranty at risk.
How long it lasts
A correctly applied roof treatment stops regrowth for 2 to 4 years, depending on your roof's aspect, shade cover and local microclimate. South-facing and heavily shaded roofs in leafy suburbs like Mount Nebo or the western hills will sit at the shorter end; sun-exposed roofs can go the full 4 years before treatment is needed again.
Best time to treat your roof
Late autumn through winter is prime moss season in Brisbane, but treatment works year-round — the key is catching growth before it's established across the whole roof. If you're planning a re-coat or repaint, treating first means the surface is properly clean and biologically dead before any coating goes on, so it bonds properly and doesn't grow moss underneath it.
Is treatment or cleaning right for your roof
If your roof has active green moss, black streaking or yellow lichen and you want it gone for good, treatment is the right call. If your roof just has surface dust, dirt or old detergent residue with no biological growth, a standard soft-wash clean is enough and treatment isn't necessary — we'll tell you straight during the inspection which one your roof actually needs.
Why Brisbane Chooses Us
Built on standards. Backed by cover.
Insured
Full public-liability cover
Every job, every crew. Certificate on request.
Standard
5.0
Across 100+ reviews
Google-verified. Real Brisbane homes, real ratings.
Rated · Google Reviews
Metro-wide
Seaside to growth corridors
One team, covering all of Greater Brisbane end-to-end.
Coverage · 50+ suburbs
Roof Treatment FAQ
Answers before you ask.
Will my roof look clean straight after treatment?+
Not immediately. The moss and lichen die within days but stay on the roof, turning brown or grey, until rain and weather wash the dead material off over the following 6 to 12 weeks. If you need an instant visual result for a sale or event, ask about combining treatment with a soft-wash clean.
Is sodium hypochlorite safe for my roof and garden?+
Yes, at the correct application rate. We dilute to suit your specific roof material and always protect garden beds, lawns and water features by pre-wetting and covering plants, and diverting runoff away from sensitive areas during application.
Will this void my roof warranty?+
No — we apply at manufacturer-compliant dilution rates and methods for Colorbond, terracotta and concrete tile roofs. Using the wrong chemical or concentration is what voids warranties; our process is designed specifically to stay within manufacturer guidelines.
How long does roof treatment actually last?+
Typically 2 to 4 years before regrowth appears, depending on shade, aspect and local rainfall. Roofs under trees or on the south side of the house in leafy areas tend to need retreatment sooner than fully sun-exposed roofs.
What's the difference between roof treatment and roof cleaning?+
Roof cleaning is a physical soft wash for an immediate visual clean, best for dirt, dust and light surface grime. Roof treatment is a chemical application that kills moss, lichen and algae at the root, with the dead growth weathering off over following weeks — it's the fix for actual biological growth, not just dirt.
Can you treat and clean my roof in the same visit?+
Yes. In many cases we soft-wash first to remove loose debris and surface dirt, then apply the treatment to kill remaining moss and lichen at the root. This gets you a cleaner look on the day plus the longer-term kill treatment underneath.
Does gloeocapsa magma actually damage my roof?+
Yes. It's the black algae responsible for those dark streaks on tiles and Colorbond, and it retains moisture against the roof surface, which accelerates tile degradation and can shorten the life of the roofing material if left untreated for years.
Complete Your Home
One crew. Whole exterior.
Bundle any of the below with your quote. One visit, one invoice, sharper price.
House WashingSoft-wash render, brick, weatherboard and Hardie.Roof CleaningSoft-wash clean for tile and Colorbond roofs.Gutter CleaningHand-cleared. Downpipes flushed. Flow verified.Driveway CleaningSurface-cleaner pressure wash for concrete and pavers.Window CleaningPure water pole outside, hand-squeegee inside.Solar Panel CleaningReclaim lost output with a soft-brush pure water rinse.
Roof Treatment across Greater Brisbane
Servicing your suburb.
Regular runs from Seaside through the inner east and out to the western and northern growth corridors.
- New Farm
- Teneriffe
- Bulimba
- Hawthorne
- Ascot
- Hamilton
- Clayfield
- Wilston
- Ashgrove
- Paddington
- Bardon
- Toowong
- Indooroopilly
- St Lucia
- Chapel Hill
- Kenmore
- Brookfield
- West End
- Highgate Hill
- Annerley
- Greenslopes
- Camp Hill
- Coorparoo
- Carindale
- Mansfield
- Wynnum
- Manly
- Redland Bay
- Cleveland
- Victoria Point
- Springwood
- Rochedale
- Sunnybank
- Calamvale
- Forest Lake
- Springfield
- Ipswich
- Brisbane CBD
- Chermside
- Aspley
- Bridgeman Downs
- Everton Park
- Stafford
- Nundah
- Banyo
- Sandgate
- Brighton
- Redcliffe
- Scarborough
- North Lakes
- Narangba
- Caboolture
- Strathpine
- Albany Creek
- Ferny Grove
- The Gap
- Mount Nebo
- Samford
- Logan Central
Suburb not listed? We still service it — send a request and we'll confirm the next available slot in your postcode.
Get your roof treatment quote today.
Send your address and a few details. We reply with a fixed-price quote, usually within minutes.