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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!

Jane S. 10 out of 10

August 23, 2019

Good response time tor my request and great job done.

Dawn F. 10 out of 10

August 23, 2019

Efficient tidy and available to my questions.

Cory S. 10 out of 10

August 23, 2019

Had company do work for us many years ago and very happy with the results. Cleaned up nicely. Kept us informed as to when they would be coming and accomodated us when we asked to have it done earlier due to gutters being replaced. Thanks!

Katherine W. 9 out of 10

August 22, 2019

Client didn’t leave any feedback

Glen S. 10 out of 10

August 22, 2019

First class job on an incredibly steep roof .

Carl P. 10 out of 10

August 20, 2019

Client didn’t leave any feedback

Barry C. 10 out of 10

August 20, 2019

During the time that I have been a customer of Thomson Roof I have never had a problem with their service. I have always been a satisfied customer.

Brian A. 10 out of 10

August 14, 2019

Contact responsive from the outset. Arrived on time as promised and began work immediately, finished and left the area tidy. Overall very quick and efficient. We will be watching and waiting for any positive/negative results.

Gus A. 10 out of 10

August 14, 2019

Arrived as scheduled. Courteous and Friendly. Thorough job!

Dawn K. 10 out of 10

August 13, 2019

Excellent service!