Get a Quote

Steen Jessen 10 out of 10

June 2, 2021

Great product and great service!

Wayne Chappel 10 out of 10

May 31, 2021

Great job … the guys were great!! I’ve already recommended your services to people I know and they will be contacting you to get their roofs treated.

Barrie Goodwin 10 out of 10

May 30, 2021

Do an excellent job.great staff.

John Pitchford 10 out of 10

May 26, 2021

They did the original cleaning and treatment followed by two Re-treatments. The roof is staying clear of moss

Margaret Mawle 10 out of 10

May 26, 2021

The cleanup was good and the roof looks like new again

Dolores Mebs 10 out of 10

May 23, 2021

All my moss is gone and clean up was well done.

Hugh Stephens 10 out of 10

May 20, 2021

Reliable. Work was reasonably priced and well explained. Manual demossing was very thorough.

Bonny Gibson 10 out of 10

April 13, 2021

Excellent service and I would not hesitate to recommend Thomson Roof Treatment

Scott Connors 10 out of 10

April 12, 2021

Doug is the man. Don’t want him to retire

Pat Wiedeman 10 out of 10

April 10, 2021

Employees were hard working, diligent in their tasks and did a great job cleaning up. The team went the extra mile to clean algae off our fascia boards which really improved the look of our home. I would definitely recommend this company.

Thomson Roof Treatment 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. Therefore, we have exceeded client expectations in Victoria BC for over 35 years! As a result, a large percentage of our business for decades has been from repeat customers.

TRT's referrals are mainly from Insurance Companies, Roofing Contractors and Home Inspectors because Thomson Roof Treatment exemplifies the method of regular roof maintenance RCABC recommends.

We deliver you the best service for moss removal in Greater Victoria, Saanich, Esquimalt, View Royal, Sidney, Colwood, Langford, Sooke and the Capital Regional District.

Worksafe BC Certified #282337

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!