Professional Roof Biocide Treatments Across Canterbury
Moss, mould, lichen and other organic growth can build up on your roof over time, affecting its appearance and potentially contributing to ongoing surface deterioration.
Southern Wash Worx provides professional roof biocide treatments designed to target organic growth and help keep your roof cleaner and better maintained over time.
Roof biocide treatments can be suitable for various residential and commercial roofing applications, depending on the roofing material and condition.
We can assess:
- Residential roofs
- Commercial roofs
- Tile roofs
- Metal roofing
- Roofs with moss build-up
- Roofs affected by mould or lichen
- Properties requiring ongoing roof maintenance
Our Process
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Roof Assessment
01We assess the roof's condition, surface type, level of organic growth and access requirements before recommending a treatment approach.
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Surface Preparation
02We prepare the surrounding areas and take appropriate precautions to protect the property and nearby surfaces before treatment begins.
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Biocide Application
03The appropriate treatment is applied to the roof surface using suitable equipment and application methods.
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Treatment Period
04The treatment works over time to target organic growth and contamination.
Treat the Problem, Not Just the Surface
Roof growth isn’t always something that can be effectively dealt with by simply blasting the roof with high pressure.
Our biocide treatment approach is designed to target unwanted organic growth and help break down moss, mould, lichen and similar contamination.
Depending on the condition of the roof, a biocide treatment may be used as a standalone treatment or as part of a broader roof cleaning service.


See the Difference Professional Roof Treatments Make
Explore examples of our roof biocide treatment work throughout Canterbury.
From residential roofs to larger properties, Southern Wash Worx helps treat moss, mould, lichen, algae, and other organic growth to improve the appearance of roofs and help keep them maintained over time.
Browse our recent roof treatment projects and see the difference professional roof care can make.










Why Choose Southern Wash Worx?
Targets Organic Growth
Biocide treatments are designed to target common roof contaminants such as moss, mould, lichen and algae.
A More Considered Approach
Not every roof needs aggressive pressure washing. Treatment can provide an alternative approach for suitable roofing surfaces and conditions.
Helps Maintain Your Roof
Regular roof maintenance can help manage organic build-up and keep the roof looking cleaner for longer.
Local Canterbury Service
We provide professional exterior cleaning services for homeowners throughout Canterbury.
Trusted by Local People & Companies
Posted on Google![]()
Keren CookTrustindex verifies that the original source of the review is Google.
Very pleased with Tom's work cleaning a challenging archgola. He did a great job. Windows look great too. Love to support local, highly recommended.Posted on Google![]()
Sue DavisonTrustindex verifies that the original source of the review is Google.
Absolutely outstanding job, cleaned very stubborn lichen off the roof (2 storey house) and the garage roof. Entire outside of the house cleaned , with no damage to paint work, front fence cleaned inside and out . All the painted surfaces look as new. Thought we would need to paint the fence- and now we don’t! Windows (outside) and the gutters were included. Hugo is an absolute machine, very thorough and a delight to engage with. We are very happy clients- highly recommend Sam and his team and look forward to engaging them again in the future.Posted on Google![]()
Dave SwadelTrustindex verifies that the original source of the review is Google.
Fantastic job done, great communication , service and timelinesss perfectPosted on Google![]()
Bob JamisonTrustindex verifies that the original source of the review is Google.
A big thank you to Hugo who has done a fantastic job washing the outside of our house. We are very happy with the results and would highly recommend to others.Posted on Google![]()
Tracey EnrightTrustindex verifies that the original source of the review is Google.
Preston did an amazing job cleaning all our windows. They look absolutely fantastic. Highly recommend Southern Wash Worx.Posted on Google![]()
Megumi RoyTrustindex verifies that the original source of the review is Google.
Highly recommend Sam and the team! Their service and communication were excellent. They did a superb job cleaning the skylights, windows, pavers, deck, and driveway. Everything looks fantastic. I would definitely use Southern Wash Worx again.Posted on Google![]()
Duncan WigzellTrustindex verifies that the original source of the review is Google.
Had my house roof treated in Swannanoa. Well priced, very efficient, thorough and friendly service (thanks Hugo!) Very happy and will definitely be using Southern Wash Worx again. I can highly recommend them.Posted on Google![]()
caroline pickettTrustindex verifies that the original source of the review is Google.
Thank you Sam for your promptness and efficiency very pleased re clearing my guttering …job well done … recommend Sam and would use him again 😄Posted on Google![]()
Russel ThompsonTrustindex verifies that the original source of the review is Google.
Sam is pleasant to deal with. Great communication. Explains all. What he finds. We are in a new subdivision with lots more earthworks to be completed, so dust dirt on all, especially the solar panels. Looking forward to better solar returns now. Thanks Sam.Posted on Google![]()
Sally RobertsTrustindex verifies that the original source of the review is Google.
Great job. Highly recommend.
Got Questions? We Have Answers
A biocide treatment is designed to target organic contamination such as moss, mould, lichen and algae. The treatment works over time rather than relying solely on high-pressure cleaning.
Not necessarily. Biocide treatments are designed to work over time, and visible results can continue to develop after application. The outcome depends on the type and amount of organic growth and the condition of the roof.
There is no single schedule that suits every roof. The frequency depends on the roof, surrounding environment and how quickly organic growth returns. We can provide maintenance recommendations following an assessment.
Yes. We provide roof cleaning and biocide treatment solutions for suitable commercial properties. Larger sites can be assessed individually to determine the appropriate cleaning and treatment approach.
Not necessarily. The roofing material, condition, surrounding environment and existing contamination all need to be considered before treatment. We’ll assess the roof and recommend a suitable approach.
