The local factors behind roof cleaning in East Gwillimbury
The difference between a $200 service call and a $6,000 rebuild in East Gwillimbury is usually about eighteen months of ignoring a small symptom.
Post-war subdivisions across York share the same construction generation, so when one street starts showing the same defect, the neighbours usually follow within a couple of seasons.
Wind loading off Lake Ontario pushes driving rain against the south and west faces of a house, which is why water entry so often shows up on one side of a East Gwillimbury home and nowhere else.
Across Sharon, River Drive Park, Mount Albert, Queensville and Holland Landing, 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.