What makes roof cleaning in St. Catharines its own problem
Homes in St. Catharines rarely fail all at once — they fail slowly, through one heating season at a time.
Salt spray and road grit carried by winter wind accelerate corrosion on exterior metal components far faster in Halton than the manufacturer's rating assumes.
Many St. Catharines properties were re-roofed at least once without the flashing being re-detailed, leaving a cosmetic seal doing structural work.
Across Downtown St. Catharines, Secord Woods, Ridley, Martindale and Bunting, the housing stock changes street by street, and the correct method changes with it. A century home with a soft-brick stack does not get the same treatment as a 2010 build with a factory-built vent — using one method on both is how systems get damaged.
If you live anywhere near the Welland Canal, the practical takeaway is that a roof cleaning visit should start with an assessment, not a tool. Any crew that begins work before telling you what they found is guessing on your behalf.