The Complete Pre-Hire Checklist for Vancouver Island Homeowners
The right questions reveal everything about a roof treatment contractor. Professional biocide specialists answer these questions confidently and specifically. Contractors who can't answer them — or who give vague, deflecting answers — should not be handling your roof.
(1) "What application method do you use — soft washing, pressure washing, or something else?" The only correct answer for professional roof treatment is soft washing (under 200 PSI). (2) "What biocide product do you use, and what is the active ingredient?" Professional applicators should name their product and active ingredient (common: potassium salts of fatty acids, didecyl dimethyl ammonium chloride, benzalkonium chloride). (3) "What is your application PSI?" Under 200 PSI is correct. Over 500 PSI on shingles is unacceptable. (4) "Do you walk on the roof during treatment, and if so, how?" Should explain minimisation of roof contact and the use of extendable application equipment.
(5) "Can you provide proof of $2M+ commercial liability insurance?" They should send a COI (certificate of insurance) without hesitation. (6) "Do you have WCB coverage for your workers?" Should be immediate yes with coverage number available. (7) "What is your written guarantee, and what exactly does it cover?" Should state: 2 years, covers return of biological growth, free re-treatment. (8) "How long have you been operating on Vancouver Island?" Look for established track record with verifiable review history. (9) "Can you provide references from similar properties in this area?" Should be able to provide 2–3 recent local references.
Consider it disqualifying. Professional contractors answer specific questions about their method, products, and credentials willingly — it's how they demonstrate expertise and win work. Vague or evasive answers indicate either inexperience or an attempt to obscure the actual service being delivered.
About Roof Labs Canada
Roof Labs Canada provides roof treatment, moss control, black streak treatment, and soft washing for Vancouver Island and the Gulf Islands. As Roof Labs Canada, we bring marine-engineered formulas, 9+ years of island experience, and a written 2-year guarantee to every project.
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Why Choose Us
500+ Five-Star Reviews
Verified customers across Vancouver Island
2-Year Written Guarantee
Free return if moss comes back
9+ Years Island Experience
966+ roofs treated
Licensed & Fully Insured
Fully certified in BC
250-889-8490
RoofLabsCanada.com
Mon–Fri 8am–6pm · Sat 9am–4pm
Professional treatment. 2-year guarantee. Marine climate engineered.
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Phone
(250) 889-8490Service Area
Greater Victoria, BC
Sidney, Saanich, Langford
and surrounding areas
Monday - Friday: 8:00 AM - 6:00 PM
Saturday: 9:00 AM - 4:00 PM
Sunday: Closed
Emergency services available 24/7