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Moss Removal and Roof Cleaning Experts

Exceeding client expectations in Victoria BC for over 35 years! We specialize in moss removal, roof cleaning and roof maintenance. Our entire family and staff are committed to meeting the high standards of moss removal and roof maintenance our customers demand. As a result, a large percentage of our business for decades has been from repeat customers. We get alot of referrals by Insurance Companies, Roofing Contractors and Home Inspectors because Thomson Roof Treatment exemplifies the method of regular roof maintenance RCABC recommends.

We would welcome the opportunity to earn your trust and deliver you the best service for moss removal in Greater Victoria, Saanich, Esquimalt, View Royal, Sidney, Colwood, Langford, Sooke and the Capital Regional District.

Click for the BBB Business Review of this Roof Cleaning & Stain Removal in Victoria BC

Our Mission

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

Manual Removal

We remove moss by hand that has accumulated and is damaging the roof structure by trapping moisture in the seams of roof shingles and flashing. Doug and his team clean away the loose debris from the roof, clear out your gutters and always tidy up the grounds before they leave your site. Your roof will immediately have more curb appeal!


We gently apply Thomson Roof Treatment! It's a unique non-toxic solution and is safe for pets and your garden. Our treatment saturates the roof shingles and neutralizes any moss, lichen, mold or mildew present. That means all the microscopic spores and root systems are killed immediately and continue to wash away for the coming months of rain. Most importantly, we use a gentle, saturating method of application; we do not use pressure washing, which can damage your roof.


After Thomson Roof Treatment has removed the moss, lichen and mildew from your roof and cleared the gutters so they flow properly- you receive a guarantee! TRT's warranty means that your roof will remain moss, lichen and mildew free for up to 2-years or we will return to make sure that you are satisfied, at no cost to yourself. Doug and his crew assess each roof individually and always provide you with a guarantee in writing.

Get in touch today for a free quote!

Darryl P. 10 out of 10

June 15, 2019

Fast, and a job well done, great cleanup afterwards.

William C. 10 out of 10

June 13, 2019

The company is reliable and they do a fine job. Also am able to make monthly payments, not pay all at once. That is a big one for us pensioners on a fixed income. Thank-you.

Tara S. 9 out of 10

June 13, 2019

Treatment gives perfect protection from moss.

Daniel P. 10 out of 10

June 13, 2019

Client didn’t leave any feedback

Stanley T. 9 out of 10

June 12, 2019

Client didn’t leave any feedback

Beverly S. 10 out of 10

June 6, 2019

I like that I know my roof and gutters are taken care of and I’m doing something good for my house.

Celia O. 10 out of 10

June 6, 2019

Fast and efficient

Linda S. 10 out of 10

June 5, 2019


Rob and Deborah B. 10 out of 10

June 5, 2019

The people at Thomson Roof Treatment were very professional and the price was very fair. They attended the site on the day and time they promised, and quietly, and without interruption completed the Job. The roof was manually de-mossed thoroughly prior to the chemical application, and all residue moss and other foreign material was removed … Continued

Alaine and Keith B. 10 out of 10

June 4, 2019

This score is for a job well and graciously done.