There is a rhythm to winter roof prep work in Richmond Hill: a quiet summer, a frantic October, and a winter of emergencies that were visible in September.
Air-sealing and window upgrades have made Richmond Hill 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.
The swing between a January cold snap and a February thaw can move a masonry assembly enough to open joints that looked sound in the fall.
Across Langstaff, South Richvale, Richvale, Rouge Fairways Rh and Snowball, 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 winter roof prep 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.