Why gas line & b-vent conversion works differently in New Tecumseth
What makes gas line & b-vent conversion in New Tecumseth unusual is not the technique, it is the age spread of the housing: a single route can cover 1910 brick and 2019 factory-built venting.
Air-sealing and window upgrades have made New Tecumseth homes far tighter than they were designed to be, and a tight house starves a natural-draft appliance of the make-up air it needs.
Range hoods and basement bathroom fans routinely out-pull an older flue, so the house depressurises and the flue reverses — a New Tecumseth problem that looks like a chimney fault but starts elsewhere in the building.
Across Nicolston, Beeton, Rosemont, Treetops and Briar Hill, 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 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.