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Moss free roofs from Victoria to Cowichan Valley

We specialize in moss removal that will help preserve the life of your roof while improving the look of your home. The only treatment of its kind, we have been providing service to lower Vancouver Island since 1980. Our work is effective and guaranteed in writing.

Our Mission

Our mission is to provide quality roof care that preserves the life of your roof and improves the look of your home.


includes manually removing moss that has accumulated. A blower is used to remove loose debris from the roof and gutters, and then to tidy up the grounds before they leave your site.


involves applying Thomson’s unique non-toxic soap based solution, which neutralizes any moss, lichen, mould or mildew present. We use a gentle, saturating method of application; we do not use pressure washing, which can damage your roof. 


guarantees that your roof will remain moss free for a specified number of months or we will return to make sure that you are satisfied, at no cost to yourself. We assess each roof individually, and will provide you with the most accurate warranty we can.

Get in touch today for a free quote!

Anne V. 9 out of 10

July 11, 2018

Client didn’t leave any feedback

Pam G. 10 out of 10

July 11, 2018

For many years Thomson Roof Treatment has treated my roof. I HAVE recommended your services to many people and neighbours. Great service.. Thanks

Yvonne H. 10 out of 10

July 9, 2018

Your workers were polite, efficient and left everything in good order. Thank you for your prompt, excellent service.

Darryl and Carol S. 10 out of 10

July 9, 2018

Reliable, affordable and we never get any moss on the roof.

Randy S. 10 out of 10

June 27, 2018

We live surrounded by Gary Oak trees and they create moss. We started with our initial treatment that included removal of all moss then the treatment was added. We were given a discount to redo 2 yrs later, which we did and now another 2 yrs later had it done again. Roof is in better … Continued

Myles C. 10 out of 10

June 26, 2018

Great clean up after, great results from original treatment.

Don H. 9 out of 10

June 26, 2018

Excellent service

Peter M. 10 out of 10

June 11, 2018

Very pleased with the result. Excellent job and dean-up afterwards. Crew efficient and professional. I will be back 2 years from now for a repeat performance.

Don L. 10 out of 10

June 1, 2018

Close attention to detail, prompt and excellent service. Thanks!

Drennan Woods 10 out of 10

May 31, 2018

The staff were thorough in cleaning and prepping the roofs for the treatment, cleanup and very easy to deal with. I have received several positive “reviews” from other owners in the Strata. This should help extend the life of our roofs. Thank you.