The local factors behind chimney cleaning & sweep in Ajax
The difference between a $200 service call and a $6,000 rebuild in Ajax is usually about eighteen months of ignoring a small symptom.
Post-war subdivisions across Durham share the same construction generation, so when one street starts showing the same defect, the neighbours usually follow within a couple of seasons.
Snow load and ice damming stress the roof-to-wall junction each winter; by spring the sealant that was doing the work has usually torn.
Across Pickering Village, Duffin's Bay, Downtown Ajax, Riverside Ajax and South Ajax, 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 chimney cleaning & sweep 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.

