The local factors behind gas line & b-vent conversion in St. Catharines
The difference between a $200 service call and a $6,000 rebuild in St. Catharines is usually about eighteen months of ignoring a small symptom.
Post-war subdivisions across Halton 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 St. Catharines home and nowhere else.
Across Louth, Applewood, Grapeview, Martindale and Downtown St. Catharines, 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 gas line & b-vent conversion 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.