The local factors behind roof cleaning in Oshawa
Two houses on the same Oshawa street, built the same year, can need completely different roof cleaning work — and usually do.
Range hoods and basement bathroom fans routinely out-pull an older flue, so the house depressurises and the flue reverses — a Oshawa problem that looks like a chimney fault but starts elsewhere in the building.
Many Oshawa properties were re-roofed at least once without the flashing being re-detailed, leaving a cosmetic seal doing structural work.
Across Raglan, Columbus, Stevenson, Pinecrest and McLaughlin, 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.
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.

